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rockbox/bootloader/main-pp.c
Barry Wardell bada0b7190 Hopefully fix CRC32 errors when loading the Sansa OF from the firmware partition. 
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12852 a1c6a512-1295-4272-9138-f99709370657
2007-03-20 12:35:45 +00:00

410 lines
11 KiB
C
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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 by Barry Wardell
*
* Based on Rockbox iriver bootloader by Linus Nielsen Feltzing
* and the ipodlinux bootloader by Daniel Palffy and Bernard Leach
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "common.h"
#include "cpu.h"
#include "file.h"
#include "system.h"
#include "kernel.h"
#include "lcd.h"
#include "font.h"
#include "ata.h"
#include "button.h"
#include "disk.h"
#include <string.h>
/*
* CRC32 implementation taken from:
*
* efone - Distributed internet phone system.
*
* (c) 1999,2000 Krzysztof Dabrowski
* (c) 1999,2000 ElysiuM deeZine
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
*/
/* based on implementation by Finn Yannick Jacobs */
#include <stdio.h>
#include <stdlib.h>
/* crc_tab[] -- this crcTable is being build by chksum_crc32GenTab().
* so make sure, you call it before using the other
* functions!
*/
static unsigned int crc_tab[256];
/* chksum_crc() -- to a given block, this one calculates the
* crc32-checksum until the length is
* reached. the crc32-checksum will be
* the result.
*/
unsigned int chksum_crc32 (unsigned char *block, unsigned int length)
{
register unsigned long crc;
unsigned long i;
crc = 0;
for (i = 0; i < length; i++)
{
crc = ((crc >> 8) & 0x00FFFFFF) ^ crc_tab[(crc ^ *block++) & 0xFF];
}
return (crc);
}
/* chksum_crc32gentab() -- to a global crc_tab[256], this one will
* calculate the crcTable for crc32-checksums.
* it is generated to the polynom [..]
*/
static void chksum_crc32gentab (void)
{
unsigned long crc, poly;
int i, j;
poly = 0xEDB88320L;
for (i = 0; i < 256; i++)
{
crc = i;
for (j = 8; j > 0; j--)
{
if (crc & 1)
{
crc = (crc >> 1) ^ poly;
}
else
{
crc >>= 1;
}
}
crc_tab[i] = crc;
}
}
/* Button definitions */
#if CONFIG_KEYPAD == IRIVER_H10_PAD
#define BOOTLOADER_BOOT_OF BUTTON_LEFT
#elif CONFIG_KEYPAD == SANSA_E200_PAD
#define BOOTLOADER_BOOT_OF BUTTON_LEFT
#endif
/* Maximum allowed firmware image size. 10MB is more than enough */
#define MAX_LOADSIZE (10*1024*1024)
/* A buffer to load the original firmware or Rockbox into */
unsigned char *loadbuffer = (unsigned char *)DRAM_START;
/* Bootloader version */
char version[] = APPSVERSION;
/* Locations and sizes in hidden partition on Sansa */
#define PPMI_SECTOR_OFFSET 1024
#define PPMI_SECTORS 1
#define MI4_HEADER_SECTORS 1
#define MI4_HEADER_SIZE 0x200
/* mi4 header structure */
struct mi4header_t {
unsigned char magic[4];
uint32_t version;
uint32_t length;
uint32_t crc32;
uint32_t enctype;
uint32_t mi4size;
uint32_t plaintext;
uint32_t dsa_key[10];
uint32_t pad[109];
unsigned char type[4];
unsigned char model[4];
};
/* PPMI header structure */
struct ppmi_header_t {
unsigned char magic[4];
uint32_t length;
uint32_t pad[126];
};
/* Load mi4 format firmware image */
int load_mi4(unsigned char* buf, char* firmware, unsigned int buffer_size)
{
int fd;
struct mi4header_t mi4header;
int rc;
unsigned long sum;
char filename[MAX_PATH];
snprintf(filename,sizeof(filename),"/.rockbox/%s",firmware);
fd = open(filename, O_RDONLY);
if(fd < 0)
{
snprintf(filename,sizeof(filename),"/%s",firmware);
fd = open(filename, O_RDONLY);
if(fd < 0)
return EFILE_NOT_FOUND;
}
read(fd, &mi4header, MI4_HEADER_SIZE);
/* We don't support encrypted mi4 files yet */
if( (mi4header.plaintext + MI4_HEADER_SIZE) != mi4header.mi4size)
return EINVALID_FORMAT;
/* MI4 file size */
printf("mi4 size: %x", mi4header.mi4size);
if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
return EFILE_TOO_BIG;
/* CRC32 */
printf("CRC32: %x", mi4header.crc32);
/* Rockbox model id */
printf("Model id: %.4s", mi4header.model);
/* Read binary type (RBOS, RBBL) */
printf("Binary type: %.4s", mi4header.type);
/* Load firmware */
lseek(fd, MI4_HEADER_SIZE, SEEK_SET);
rc = read(fd, buf, mi4header.mi4size-MI4_HEADER_SIZE);
if(rc < (int)mi4header.mi4size-MI4_HEADER_SIZE)
return EREAD_IMAGE_FAILED;
/* Check CRC32 to see if we have a valid file */
sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
printf("Calculated CRC32: %x", sum);
if(sum != mi4header.crc32)
return EBAD_CHKSUM;
return EOK;
}
#ifdef SANSA_E200
/* Load mi4 firmware from a hidden disk partition */
int load_mi4_part(unsigned char* buf, struct partinfo* pinfo, unsigned int buffer_size)
{
struct mi4header_t mi4header;
struct ppmi_header_t ppmi_header;
unsigned long sum;
/* Read header to find out how long the mi4 file is. */
ata_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET,
PPMI_SECTORS, &ppmi_header);
/* The first four characters at 0x80000 (sector 1024) should be PPMI*/
if( memcmp(ppmi_header.magic, "PPMI", 4) )
return EFILE_NOT_FOUND;
printf("BL mi4 size: %x", ppmi_header.length);
/* Read mi4 header of the OF */
ata_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
+ (ppmi_header.length/512), MI4_HEADER_SECTORS, &mi4header);
/* We don't support encrypted mi4 files yet */
if( (mi4header.plaintext) != (mi4header.mi4size-MI4_HEADER_SIZE))
return EINVALID_FORMAT;
/* MI4 file size */
printf("OF mi4 size: %x", mi4header.mi4size);
if ((mi4header.mi4size-MI4_HEADER_SIZE) > buffer_size)
return EFILE_TOO_BIG;
/* CRC32 */
printf("CRC32: %x", mi4header.crc32);
/* Rockbox model id */
printf("Model id: %.4s", mi4header.model);
/* Read binary type (RBOS, RBBL) */
printf("Binary type: %.4s", mi4header.type);
/* Load firmware */
ata_read_sectors(pinfo->start + PPMI_SECTOR_OFFSET + PPMI_SECTORS
+ (ppmi_header.length/512) + MI4_HEADER_SECTORS,
(mi4header.mi4size-MI4_HEADER_SIZE)/512, buf);
/* Check CRC32 to see if we have a valid file */
sum = chksum_crc32 (buf,mi4header.mi4size-MI4_HEADER_SIZE);
printf("Calculated CRC32: %x", sum);
if(sum != mi4header.crc32)
return EBAD_CHKSUM;
return EOK;
}
#endif
void* main(void)
{
char buf[256];
int i;
int btn;
int rc;
int num_partitions;
unsigned short* identify_info;
struct partinfo* pinfo;
chksum_crc32gentab ();
system_init();
kernel_init();
lcd_init();
font_init();
button_init();
lcd_set_foreground(LCD_WHITE);
lcd_set_background(LCD_BLACK);
lcd_clear_display();
btn = button_read_device();
/* Enable bootloader messages if any button is pressed */
if (btn)
verbose = true;
lcd_setfont(FONT_SYSFIXED);
printf("Rockbox boot loader");
printf("Version: %s", version);
printf(MODEL_NAME);
i=ata_init();
if (i==0) {
identify_info=ata_get_identify();
/* Show model */
for (i=0; i < 20; i++) {
((unsigned short*)buf)[i]=htobe16(identify_info[i+27]);
}
buf[40]=0;
for (i=39; i && buf[i]==' '; i--) {
buf[i]=0;
}
printf(buf);
} else {
error(EATA, i);
}
disk_init();
num_partitions = disk_mount_all();
if (num_partitions<=0)
{
error(EDISK,num_partitions);
}
/* Just list the first 2 partitions since we don't have any devices yet
that have more than that */
for(i=0; i<2; i++)
{
pinfo = disk_partinfo(i);
printf("Partition %d: 0x%02x %ld MB",
i, pinfo->type, pinfo->size / 2048);
}
if(btn & BOOTLOADER_BOOT_OF)
{
/* Load original mi4 firmware in to a memory buffer called loadbuffer.
The rest of the loading is done in crt0.S.
1) First try reading from the hidden partition (on Sansa only).
2) Next try a decrypted mi4 file in /System/OF.mi4
3) Finally, try a raw firmware binary in /System/OF.mi4. It should be
a mi4 firmware decrypted and header stripped using mi4code.
*/
printf("Loading original firmware...");
#ifdef SANSA_E200
/* First try a (hidden) firmware partition */
printf("Trying firmware partition");
pinfo = disk_partinfo(1);
if(pinfo->type == PARTITION_TYPE_OS2_HIDDEN_C_DRIVE)
{
rc = load_mi4_part(loadbuffer, pinfo, MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load from partition");
printf(strerror(rc));
} else {
return (void*)loadbuffer;
}
} else {
printf("No hidden partition found.");
}
#endif
printf("Trying /System/OF.mi4");
rc=load_mi4(loadbuffer, "/System/OF.mi4", MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load /System/OF.mi4");
printf(strerror(rc));
} else {
return (void*)loadbuffer;
}
printf("Trying /System/OF.bin");
rc=load_raw_firmware(loadbuffer, "/System/OF.bin", MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load /System/OF.bin");
printf(strerror(rc));
} else {
return (void*)loadbuffer;
}
error(EBOOTFILE, rc);
} else {
printf("Loading Rockbox...");
rc=load_mi4(loadbuffer, BOOTFILE, MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load %s:", BOOTFILE);
printf(strerror(rc));
/* Try loading rockbox from old rockbox.e200/rockbox.h10 format */
rc=load_firmware(loadbuffer, OLD_BOOTFILE, MAX_LOADSIZE);
if (rc < EOK) {
printf("Can't load %s:", OLD_BOOTFILE);
error(EBOOTFILE, rc);
}
}
}
return (void*)loadbuffer;
}
/* These functions are present in the firmware library, but we reimplement
them here because the originals do a lot more than we want */
void usb_acknowledge(void)
{
}
void usb_wait_for_disconnect(void)
{
}
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