a66dfa4ab7
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22317 a1c6a512-1295-4272-9138-f99709370657
699 lines
20 KiB
C
699 lines
20 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* mkamsboot.c - a tool for merging bootloader code into an Sansa V2
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* (AMS) firmware file
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*
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* Copyright (C) 2008 Dave Chapman
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/*
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Insert a Rockbox bootloader into a Sansa AMS original firmware file.
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Layout of a Sansa AMS original firmware file:
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---------------------- 0x0
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| HEADER |
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|----------------------| 0x400
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| FIRMWARE BLOCK |
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|----------------------| 0x400 + firmware block size
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| LIBRARIES/DATA |
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---------------------- END
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We replace the main firmware block (bytes 0x400..0x400+firmware_size)
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as follows:
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---------------------- 0x0
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| |
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| Dual-boot code |
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| |
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|----------------------|
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| EMPTY SPACE |
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|----------------------|
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| compressed RB image |
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|----------------------|
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| compressed OF image |
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|----------------------|
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| UCL unpack function |
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----------------------
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This entire block fits into the space previously occupied by the main
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firmware block - the space saved by compressing the OF image is used
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to store the compressed version of the Rockbox bootloader.
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On version 1 firmwares, the OF image is typically about 120KB, which allows
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us to store a Rockbox bootloader with an uncompressed size of about 60KB-70KB.
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Version 2 firmwares are bigger and are stored in SDRAM (instead of IRAM).
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In both cases, the RAM we are using is mapped at offset 0x0.
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mkamsboot then corrects the checksums and writes a new legal firmware
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file which can be installed on the device.
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When the Sansa device boots, this firmware block is loaded to RAM at
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address 0x0 and executed.
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Firstly, the dual-boot code will copy the UCL unpack function to the
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end of RAM.
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Then, depending on the detection of the dual-boot keypress, either the
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OF image or the Rockbox image is copied to the end of RAM (just before
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the ucl unpack function) and uncompressed to the start of RAM.
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Finally, the ucl unpack function branches to address 0x0, passing
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execution to the uncompressed firmware.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <ucl/ucl.h>
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#include "mkamsboot.h"
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#include "md5.h"
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/* Header for ARM code binaries */
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#include "dualboot.h"
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/* Win32 compatibility */
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#ifndef O_BINARY
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#define O_BINARY 0
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#endif
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/* 4 for m200, 2 for e200/c200, 1 or 2 for fuze/clop */
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static const unsigned short hw_revisions[] = {
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[MODEL_FUZE] = 1,
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[MODEL_CLIP] = 1,
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[MODEL_CLIPV2] = 2,
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[MODEL_E200V2] = 2,
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[MODEL_M200V4] = 4,
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[MODEL_C200V2] = 2,
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};
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/* version 2 is used in Clipv2 and Fuzev2 firmwares */
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static const unsigned short fw_revisions[] = {
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[MODEL_FUZE] = 1,
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[MODEL_CLIP] = 1,
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[MODEL_CLIPV2] = 2,
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[MODEL_E200V2] = 1,
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[MODEL_M200V4] = 1,
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[MODEL_C200V2] = 1,
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};
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/* Descriptive name of these models */
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static const char* model_names[] = {
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[MODEL_FUZE] = "Fuze",
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[MODEL_CLIP] = "Clip",
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[MODEL_CLIPV2] = "Clip",
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[MODEL_E200V2] = "e200",
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[MODEL_M200V4] = "m200",
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[MODEL_C200V2] = "c200",
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};
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/* Dualboot functions for these models */
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static const unsigned char* bootloaders[] = {
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[MODEL_FUZE] = dualboot_fuze,
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[MODEL_CLIP] = dualboot_clip,
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[MODEL_CLIPV2] = dualboot_clipv2,
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[MODEL_E200V2] = dualboot_e200v2,
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[MODEL_M200V4] = dualboot_m200v4,
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[MODEL_C200V2] = dualboot_c200v2,
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};
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/* Size of dualboot functions for these models */
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static const int bootloader_sizes[] = {
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[MODEL_FUZE] = sizeof(dualboot_fuze),
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[MODEL_CLIP] = sizeof(dualboot_clip),
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[MODEL_CLIPV2] = sizeof(dualboot_clipv2),
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[MODEL_E200V2] = sizeof(dualboot_e200v2),
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[MODEL_M200V4] = sizeof(dualboot_m200v4),
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[MODEL_C200V2] = sizeof(dualboot_c200v2),
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};
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/* Model names used in the Rockbox header in ".sansa" files - these match the
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-add parameter to the "scramble" tool */
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static const char* rb_model_names[] = {
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[MODEL_FUZE] = "fuze",
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[MODEL_CLIP] = "clip",
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[MODEL_CLIPV2] = "clv2",
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[MODEL_E200V2] = "e2v2",
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[MODEL_M200V4] = "m2v4",
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[MODEL_C200V2] = "c2v2",
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};
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/* Model numbers used to initialise the checksum in the Rockbox header in
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".sansa" files - these are the same as MODEL_NUMBER in config-target.h */
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static const int rb_model_num[] = {
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[MODEL_FUZE] = 43,
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[MODEL_CLIP] = 40,
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[MODEL_CLIPV2] = 60,
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[MODEL_E200V2] = 41,
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[MODEL_M200V4] = 42,
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[MODEL_C200V2] = 44
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};
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/* Checksums of unmodified original firmwares - for safety, and device
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detection */
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static struct md5sums sansasums[] = {
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/* NOTE: Different regional versions of the firmware normally only
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differ in the filename - the md5sums are identical */
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/* model version md5 */
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{ MODEL_E200V2, "3.01.11", "e622ca8cb6df423f54b8b39628a1f0a3" },
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{ MODEL_E200V2, "3.01.14", "2c1d0383fc3584b2cc83ba8cc2243af6" },
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{ MODEL_E200V2, "3.01.16", "12563ad71b25a1034cf2092d1e0218c4" },
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{ MODEL_FUZE, "1.01.11", "cac8ffa03c599330ac02c4d41de66166" },
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{ MODEL_FUZE, "1.01.15", "df0e2c1612727f722c19a3c764cff7f2" },
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{ MODEL_FUZE, "1.01.22", "5aff5486fe8dd64239cc71eac470af98" },
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{ MODEL_FUZE, "1.02.26", "7c632c479461c48c8833baed74eb5e4f" },
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{ MODEL_C200V2, "3.02.05", "b6378ebd720b0ade3fad4dc7ab61c1a5" },
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{ MODEL_M200V4, "4.00.45", "82e3194310d1514e3bbcd06e84c4add3" },
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{ MODEL_M200V4, "4.01.08-A", "fc9dd6116001b3e6a150b898f1b091f0" },
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{ MODEL_M200V4, "4.01.08-E", "d3fb7d8ec8624ee65bc99f8dab0e2369" },
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{ MODEL_CLIP, "1.01.17", "12caad785d506219d73f538772afd99e" },
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{ MODEL_CLIP, "1.01.18", "d720b266bd5afa38a198986ef0508a45" },
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{ MODEL_CLIP, "1.01.20", "236d8f75189f468462c03f6d292cf2ac" },
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{ MODEL_CLIP, "1.01.29", "c12711342169c66e209540cd1f27cd26" },
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{ MODEL_CLIP, "1.01.30", "f2974d47c536549c9d8259170f1dbe4d" },
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{ MODEL_CLIP, "1.01.32", "d835d12342500732ffb9c4ee54abec15" },
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{ MODEL_CLIPV2, "2.01.16", "c57fb3fcbe07c2c9b360f060938f80cb" },
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{ MODEL_CLIPV2, "2.01.32", "0ad3723e52022509089d938d0fbbf8c5" }
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};
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#define NUM_MD5S (sizeof(sansasums)/sizeof(sansasums[0]))
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int firmware_revision(int model)
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{
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return fw_revisions[model];
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}
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static off_t filesize(int fd)
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{
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struct stat buf;
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if (fstat(fd, &buf) < 0) {
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perror("[ERR] Checking filesize of input file");
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return -1;
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} else {
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return(buf.st_size);
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}
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}
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static uint32_t get_uint32le(unsigned char* p)
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{
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return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
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}
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static uint32_t get_uint32be(unsigned char* p)
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{
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return (p[0] << 24) | (p[1] << 16) | (p[2] << 8) | p[3];
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}
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static void put_uint32le(unsigned char* p, uint32_t x)
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{
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p[0] = x & 0xff;
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p[1] = (x >> 8) & 0xff;
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p[2] = (x >> 16) & 0xff;
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p[3] = (x >> 24) & 0xff;
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}
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void calc_MD5(unsigned char* buf, int len, char *md5str)
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{
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int i;
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md5_context ctx;
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unsigned char md5sum[16];
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md5_starts(&ctx);
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md5_update(&ctx, buf, len);
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md5_finish(&ctx, md5sum);
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for (i = 0; i < 16; ++i)
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sprintf(md5str + 2*i, "%02x", md5sum[i]);
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}
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/* Calculate a simple checksum used in Sansa Original Firmwares */
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static uint32_t calc_checksum(unsigned char* buf, uint32_t n)
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{
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uint32_t sum = 0;
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uint32_t i;
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for (i=0;i<n;i+=4)
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sum += get_uint32le(buf + i);
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return sum;
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}
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static int get_model(int model_id)
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{
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switch(model_id) {
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case 0x1e:
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return MODEL_FUZE;
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case 0x22:
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return MODEL_CLIP;
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case 0x23:
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return MODEL_C200V2;
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case 0x24:
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return MODEL_E200V2;
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case 0x25:
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return MODEL_M200V4;
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case 0x27:
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return MODEL_CLIPV2;
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}
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return MODEL_UNKNOWN;
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}
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/* Compress using nrv2e algorithm : Thumb decompressor fits in 168 bytes ! */
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static unsigned char* uclpack(unsigned char* inbuf, int insize, int* outsize)
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{
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int maxsize;
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unsigned char* outbuf;
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int r;
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/* The following formula comes from the UCL documentation */
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maxsize = insize + (insize / 8) + 256;
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/* Allocate some memory for the output buffer */
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outbuf = malloc(maxsize);
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if (outbuf == NULL)
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return NULL;
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r = ucl_nrv2e_99_compress(
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(const ucl_bytep) inbuf,
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(ucl_uint) insize,
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(ucl_bytep) outbuf,
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(ucl_uintp) outsize,
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0, 10, NULL, NULL);
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if (r != UCL_E_OK || *outsize > maxsize) {
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/* this should NEVER happen, and implies memory corruption */
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fprintf(stderr, "internal error - compression failed: %d\n", r);
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free(outbuf);
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return NULL;
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}
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return outbuf;
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}
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#define ERROR(format, ...) \
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do { \
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snprintf(errstr, errstrsize, format, __VA_ARGS__); \
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goto error; \
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} while(0)
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/* Loads a Sansa AMS Original Firmware file into memory */
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unsigned char* load_of_file(
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char* filename, off_t* bufsize, struct md5sums *sum,
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int* firmware_size, unsigned char** of_packed,
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int* of_packedsize, char* errstr, int errstrsize)
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{
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int fd;
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unsigned char* buf =NULL;
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off_t n;
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unsigned int i=0;
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uint32_t checksum;
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int model_id;
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unsigned int last_word;
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fd = open(filename, O_RDONLY|O_BINARY);
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if (fd < 0)
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ERROR("[ERR] Could not open %s for reading\n", filename);
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*bufsize = filesize(fd);
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buf = malloc(*bufsize);
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if (buf == NULL)
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ERROR("[ERR] Could not allocate memory for %s\n", filename);
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n = read(fd, buf, *bufsize);
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if (n != *bufsize)
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ERROR("[ERR] Could not read file %s\n", filename);
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/* check the file */
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/* Calculate MD5 checksum of OF */
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calc_MD5(buf, *bufsize, sum->md5);
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while ((i < NUM_MD5S) && (strcmp(sansasums[i].md5, sum->md5) != 0))
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i++;
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if (i < NUM_MD5S) {
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*sum = sansasums[i];
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} else {
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int fw_version = (get_uint32le(&buf[0x204]) == 0x0000f000) ? 2 : 1;
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model_id = buf[(fw_version == 2) ? 0x219 : 0x215];
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sum->model = get_model(model_id);
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if (sum->model == MODEL_UNKNOWN)
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ERROR("[ERR] Unknown firmware model (v%d) - model id 0x%02x\n",
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fw_version, model_id);
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#if 1 /* comment to test new OFs */
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char tested_versions[100];
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tested_versions[0] = '\0';
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for (i = 0; i < NUM_MD5S ; i++)
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if (sansasums[i].model == sum->model) {
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if (tested_versions[0] != '\0') {
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strncat(tested_versions, ", ",
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sizeof(tested_versions) - strlen(tested_versions) - 1);
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}
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strncat(tested_versions, sansasums[i].version,
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sizeof(tested_versions) - strlen(tested_versions) - 1);
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}
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ERROR("[ERR] Original firmware unknown, please try an other version." \
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" Tested %s versions are : %s\n",
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model_names[sum->model], tested_versions);
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#endif
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}
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/* TODO: Do some more sanity checks on the OF image. Some images (like
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m200v4) dont have a checksum at the end, only padding (0xdeadbeef). */
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last_word = *bufsize - 4;
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checksum = get_uint32le(buf + last_word);
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if (checksum != 0xefbeadde && checksum != calc_checksum(buf, last_word))
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ERROR("%s", "[ERR] Whole file checksum failed\n");
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if (bootloaders[sum->model] == NULL)
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ERROR("[ERR] Unsupported model - \"%s\"\n", model_names[sum->model]);
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/* Get the firmware size */
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if (fw_revisions[sum->model] == 1)
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*firmware_size = get_uint32le(&buf[0x0c]);
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else if (fw_revisions[sum->model] == 2)
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*firmware_size = get_uint32le(&buf[0x10]);
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/* Compress the original firmware image */
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*of_packed = uclpack(buf + 0x400, *firmware_size, of_packedsize);
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if (*of_packed == NULL)
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ERROR("[ERR] Could not compress %s\n", filename);
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return buf;
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error:
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free(buf);
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return NULL;
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}
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/* Loads a rockbox bootloader file into memory */
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unsigned char* load_rockbox_file(
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char* filename, int model, int* bufsize, int* rb_packedsize,
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char* errstr, int errstrsize)
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{
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int fd;
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unsigned char* buf = NULL;
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unsigned char* packed = NULL;
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unsigned char header[8];
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uint32_t sum;
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off_t n;
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int i;
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fd = open(filename, O_RDONLY|O_BINARY);
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if (fd < 0)
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ERROR("[ERR] Could not open %s for reading\n", filename);
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/* Read Rockbox header */
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n = read(fd, header, sizeof(header));
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if (n != sizeof(header))
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ERROR("[ERR] Could not read file %s\n", filename);
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/* Check for correct model string */
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if (memcmp(rb_model_names[model], header + 4, 4)!=0)
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ERROR("[ERR] Model name \"%s\" not found in %s\n",
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rb_model_names[model], filename);
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*bufsize = filesize(fd) - sizeof(header);
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buf = malloc(*bufsize);
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if (buf == NULL)
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ERROR("[ERR] Could not allocate memory for %s\n", filename);
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n = read(fd, buf, *bufsize);
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if (n != *bufsize)
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ERROR("[ERR] Could not read file %s\n", filename);
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/* Check checksum */
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sum = rb_model_num[model];
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for (i = 0; i < *bufsize; i++) {
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/* add 8 unsigned bits but keep a 32 bit sum */
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sum += buf[i];
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}
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if (sum != get_uint32be(header))
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ERROR("[ERR] Checksum mismatch in %s\n", filename);
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packed = uclpack(buf, *bufsize, rb_packedsize);
|
|
if(packed == NULL)
|
|
ERROR("[ERR] Could not compress %s\n", filename);
|
|
|
|
free(buf);
|
|
return packed;
|
|
|
|
error:
|
|
free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
#undef ERROR
|
|
|
|
/* Patches a Sansa AMS Original Firmware file */
|
|
void patch_firmware(
|
|
int model, int fw_revision, int firmware_size, unsigned char* buf,
|
|
int len, unsigned char* of_packed, int of_packedsize,
|
|
unsigned char* rb_packed, int rb_packedsize)
|
|
{
|
|
unsigned char *p;
|
|
uint32_t sum, filesum;
|
|
unsigned int i;
|
|
|
|
/* Zero the original firmware area - not needed, but helps debugging */
|
|
memset(buf + 0x400, 0, firmware_size);
|
|
|
|
/* Insert dual-boot bootloader at offset 0 */
|
|
memcpy(buf + 0x400, bootloaders[model], bootloader_sizes[model]);
|
|
|
|
/* We are filling the firmware buffer backwards from the end */
|
|
p = buf + 0x400 + firmware_size;
|
|
|
|
/* 1 - UCL unpack function */
|
|
p -= sizeof(nrv2e_d8);
|
|
memcpy(p, nrv2e_d8, sizeof(nrv2e_d8));
|
|
|
|
/* 2 - Compressed copy of original firmware */
|
|
p -= of_packedsize;
|
|
memcpy(p, of_packed, of_packedsize);
|
|
|
|
/* 3 - Compressed copy of Rockbox bootloader */
|
|
p -= rb_packedsize;
|
|
memcpy(p, rb_packed, rb_packedsize);
|
|
|
|
/* Write the locations of the various images to the variables at the
|
|
start of the dualboot image - we save the location of the last byte
|
|
in each image, along with the size in bytes */
|
|
|
|
/* UCL unpack function */
|
|
put_uint32le(&buf[0x420], firmware_size - 1);
|
|
put_uint32le(&buf[0x424], sizeof(nrv2e_d8));
|
|
|
|
/* Compressed original firmware image */
|
|
put_uint32le(&buf[0x428], firmware_size - sizeof(nrv2e_d8) - 1);
|
|
put_uint32le(&buf[0x42c], of_packedsize);
|
|
|
|
/* Compressed Rockbox image */
|
|
put_uint32le(&buf[0x430], firmware_size - sizeof(nrv2e_d8) - of_packedsize
|
|
- 1);
|
|
put_uint32le(&buf[0x434], rb_packedsize);
|
|
|
|
|
|
/* Update the firmware block checksum */
|
|
sum = calc_checksum(buf + 0x400, firmware_size);
|
|
|
|
if (fw_revision == 1) {
|
|
put_uint32le(&buf[0x04], sum);
|
|
put_uint32le(&buf[0x204], sum);
|
|
} else if (fw_revision == 2) {
|
|
put_uint32le(&buf[0x08], sum);
|
|
put_uint32le(&buf[0x208], sum);
|
|
|
|
/* Update the header checksums */
|
|
put_uint32le(&buf[0x1fc], calc_checksum(buf, 0x1fc));
|
|
put_uint32le(&buf[0x3fc], calc_checksum(buf + 0x200, 0x1fc));
|
|
}
|
|
|
|
/* Update the whole-file checksum */
|
|
filesum = 0;
|
|
for (i=0;i < (unsigned)len - 4; i+=4)
|
|
filesum += get_uint32le(&buf[i]);
|
|
|
|
put_uint32le(buf + len - 4, filesum);
|
|
}
|
|
|
|
/* returns size of new firmware block */
|
|
int total_size(int model, int rb_packedsize, int of_packedsize)
|
|
{
|
|
return bootloader_sizes[model] + sizeof(nrv2e_d8) + of_packedsize +
|
|
rb_packedsize;
|
|
}
|
|
|
|
#ifndef LIB
|
|
/* standalone executable */
|
|
int main(int argc, char* argv[])
|
|
{
|
|
char *infile, *bootfile, *outfile;
|
|
int fdout;
|
|
off_t len;
|
|
uint32_t n;
|
|
unsigned char* buf;
|
|
int firmware_size;
|
|
int bootloader_size;
|
|
unsigned char* of_packed;
|
|
int of_packedsize;
|
|
unsigned char* rb_packed;
|
|
int rb_packedsize;
|
|
int totalsize;
|
|
char errstr[200];
|
|
struct md5sums sum;
|
|
char md5sum[33]; /* 32 digits + \0 */
|
|
|
|
sum.md5 = md5sum;
|
|
|
|
/* VERSION comes frome the Makefile */
|
|
fprintf(stderr,
|
|
"mkamsboot Version " VERSION "\n"
|
|
"This is free software; see the source for copying conditions. There is NO\n"
|
|
"warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n"
|
|
"\n");
|
|
|
|
if(argc != 4) {
|
|
printf("Usage: mkamsboot <firmware file> <boot file> <output file>\n");
|
|
return 1;
|
|
}
|
|
|
|
infile = argv[1];
|
|
bootfile = argv[2];
|
|
outfile = argv[3];
|
|
|
|
/* Load original firmware file */
|
|
buf = load_of_file(infile, &len, &sum,
|
|
&firmware_size, &of_packed, &of_packedsize, errstr, sizeof(errstr));
|
|
|
|
if (buf == NULL) {
|
|
fprintf(stderr, "%s", errstr);
|
|
fprintf(stderr, "[ERR] Could not load %s\n", infile);
|
|
return 1;
|
|
}
|
|
|
|
fprintf(stderr, "[INFO] Original firmware MD5 checksum match\n");
|
|
fprintf(stderr, "[INFO] Model: Sansa %s v%d - Firmware version: %s\n",
|
|
model_names[sum.model], hw_revisions[sum.model], sum.version);
|
|
|
|
|
|
/* Load bootloader file */
|
|
rb_packed = load_rockbox_file(bootfile, sum.model, &bootloader_size,
|
|
&rb_packedsize, errstr, sizeof(errstr));
|
|
if (rb_packed == NULL) {
|
|
fprintf(stderr, "%s", errstr);
|
|
fprintf(stderr, "[ERR] Could not load %s\n", bootfile);
|
|
free(buf);
|
|
free(of_packed);
|
|
return 1;
|
|
}
|
|
|
|
printf("[INFO] Firmware patching has begun !\n\n");
|
|
|
|
fprintf(stderr, "[INFO] Original firmware size: %d bytes\n",
|
|
firmware_size);
|
|
fprintf(stderr, "[INFO] Packed OF size: %d bytes\n",
|
|
of_packedsize);
|
|
fprintf(stderr, "[INFO] Bootloader size: %d bytes\n",
|
|
(int)bootloader_size);
|
|
fprintf(stderr, "[INFO] Packed bootloader size: %d bytes\n",
|
|
rb_packedsize);
|
|
fprintf(stderr, "[INFO] Dual-boot function size: %d bytes\n",
|
|
bootloader_sizes[sum.model]);
|
|
fprintf(stderr, "[INFO] UCL unpack function size: %u bytes\n",
|
|
(unsigned int)sizeof(nrv2e_d8));
|
|
|
|
totalsize = total_size(sum.model, of_packedsize, rb_packedsize);
|
|
|
|
fprintf(stderr, "[INFO] Total size of new image: %d bytes\n", totalsize);
|
|
|
|
if (totalsize > firmware_size) {
|
|
fprintf(stderr, "[ERR] No room to insert bootloader, aborting\n");
|
|
free(buf);
|
|
free(of_packed);
|
|
free(rb_packed);
|
|
return 1;
|
|
}
|
|
|
|
patch_firmware(sum.model, fw_revisions[sum.model], firmware_size, buf, len,
|
|
of_packed, of_packedsize, rb_packed, rb_packedsize);
|
|
|
|
/* Write the new firmware */
|
|
fdout = open(outfile, O_CREAT|O_TRUNC|O_WRONLY|O_BINARY, 0666);
|
|
|
|
if (fdout < 0) {
|
|
fprintf(stderr, "[ERR] Could not open %s for writing\n", outfile);
|
|
free(buf);
|
|
free(of_packed);
|
|
free(rb_packed);
|
|
return 1;
|
|
}
|
|
|
|
n = write(fdout, buf, len);
|
|
|
|
if (n != (unsigned)len) {
|
|
fprintf(stderr, "[ERR] Could not write firmware file\n");
|
|
free(buf);
|
|
free(of_packed);
|
|
free(rb_packed);
|
|
return 1;
|
|
}
|
|
|
|
close(fdout);
|
|
free(buf);
|
|
free(of_packed);
|
|
free(rb_packed);
|
|
fprintf(stderr, "\n[INFO] Patching succeeded!\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|