248 lines
7.9 KiB
C
248 lines
7.9 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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* Copyright (C) 2021 Aidan MacDonald
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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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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <endian.h> /* TODO: find portable alternative */
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#define SPL_HEADER_SIZE 512
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#define SPL_KEY_SIZE 1536
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#define SPL_CODE_OFFSET (SPL_HEADER_SIZE + SPL_KEY_SIZE)
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#define SPL_MAX_SIZE (12 * 1024)
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#define SPL_CODE_SIZE (SPL_MAX_SIZE - SPL_CODE_OFFSET)
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#define FLASH_TYPE_NAND 0x00
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#define FLASH_TYPE_NOR 0xaa
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struct flash_sig {
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uint8_t magic[8]; /* fixed magic bytes */
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uint8_t type; /* flash type, either NAND or NOR */
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uint8_t crc7; /* CRC7 of SPL code */
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uint8_t ppb; /* pages per block for NAND */
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uint8_t bpp; /* bytes per page for NAND */
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uint32_t length; /* total size of SPL, including header/key */
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};
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static const uint8_t flash_sig_magic[8] =
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{0x06, 0x05, 0x04, 0x03, 0x02, 0x55, 0xaa, 0x55};
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/* calculate CRC7 used in flash header */
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uint8_t crc7(const uint8_t* buf, size_t len)
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{
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/* table-based computation of CRC7 */
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static const uint8_t t[256] = {
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0x00, 0x09, 0x12, 0x1b, 0x24, 0x2d, 0x36, 0x3f,
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0x48, 0x41, 0x5a, 0x53, 0x6c, 0x65, 0x7e, 0x77,
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0x19, 0x10, 0x0b, 0x02, 0x3d, 0x34, 0x2f, 0x26,
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0x51, 0x58, 0x43, 0x4a, 0x75, 0x7c, 0x67, 0x6e,
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0x32, 0x3b, 0x20, 0x29, 0x16, 0x1f, 0x04, 0x0d,
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0x7a, 0x73, 0x68, 0x61, 0x5e, 0x57, 0x4c, 0x45,
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0x2b, 0x22, 0x39, 0x30, 0x0f, 0x06, 0x1d, 0x14,
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0x63, 0x6a, 0x71, 0x78, 0x47, 0x4e, 0x55, 0x5c,
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0x64, 0x6d, 0x76, 0x7f, 0x40, 0x49, 0x52, 0x5b,
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0x2c, 0x25, 0x3e, 0x37, 0x08, 0x01, 0x1a, 0x13,
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0x7d, 0x74, 0x6f, 0x66, 0x59, 0x50, 0x4b, 0x42,
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0x35, 0x3c, 0x27, 0x2e, 0x11, 0x18, 0x03, 0x0a,
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0x56, 0x5f, 0x44, 0x4d, 0x72, 0x7b, 0x60, 0x69,
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0x1e, 0x17, 0x0c, 0x05, 0x3a, 0x33, 0x28, 0x21,
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0x4f, 0x46, 0x5d, 0x54, 0x6b, 0x62, 0x79, 0x70,
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0x07, 0x0e, 0x15, 0x1c, 0x23, 0x2a, 0x31, 0x38,
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0x41, 0x48, 0x53, 0x5a, 0x65, 0x6c, 0x77, 0x7e,
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0x09, 0x00, 0x1b, 0x12, 0x2d, 0x24, 0x3f, 0x36,
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0x58, 0x51, 0x4a, 0x43, 0x7c, 0x75, 0x6e, 0x67,
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0x10, 0x19, 0x02, 0x0b, 0x34, 0x3d, 0x26, 0x2f,
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0x73, 0x7a, 0x61, 0x68, 0x57, 0x5e, 0x45, 0x4c,
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0x3b, 0x32, 0x29, 0x20, 0x1f, 0x16, 0x0d, 0x04,
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0x6a, 0x63, 0x78, 0x71, 0x4e, 0x47, 0x5c, 0x55,
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0x22, 0x2b, 0x30, 0x39, 0x06, 0x0f, 0x14, 0x1d,
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0x25, 0x2c, 0x37, 0x3e, 0x01, 0x08, 0x13, 0x1a,
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0x6d, 0x64, 0x7f, 0x76, 0x49, 0x40, 0x5b, 0x52,
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0x3c, 0x35, 0x2e, 0x27, 0x18, 0x11, 0x0a, 0x03,
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0x74, 0x7d, 0x66, 0x6f, 0x50, 0x59, 0x42, 0x4b,
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0x17, 0x1e, 0x05, 0x0c, 0x33, 0x3a, 0x21, 0x28,
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0x5f, 0x56, 0x4d, 0x44, 0x7b, 0x72, 0x69, 0x60,
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0x0e, 0x07, 0x1c, 0x15, 0x2a, 0x23, 0x38, 0x31,
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0x46, 0x4f, 0x54, 0x5d, 0x62, 0x6b, 0x70, 0x79
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};
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uint8_t crc = 0;
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while(len--)
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crc = t[(crc << 1) ^ *buf++];
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return crc;
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}
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void die(const char* msg, ...)
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{
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va_list ap;
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va_start(ap, msg);
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vfprintf(stderr, msg, ap);
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fprintf(stderr, "\n");
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va_end(ap);
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exit(1);
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}
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void do_flash(const uint8_t* spl_code,
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uint32_t spl_length,
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int flash_type,
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int pages_per_block,
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int bytes_per_block,
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FILE* outfile)
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{
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/* verify parameters */
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if(flash_type != FLASH_TYPE_NAND
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&& flash_type != FLASH_TYPE_NOR) {
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die("invalid flash type");
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}
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if(pages_per_block < 0 || pages_per_block > 0xff)
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die("invalid pages_per_block");
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if(bytes_per_block < 0 || bytes_per_block > 0xff)
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die("invalid bytes_per_block");
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/* fill flash signature */
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struct flash_sig sig;
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memcpy(sig.magic, flash_sig_magic, 8);
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sig.type = flash_type & 0xff;
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sig.crc7 = crc7(spl_code, spl_length);
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sig.ppb = pages_per_block & 0xff;
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sig.bpp = bytes_per_block & 0xff;
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sig.length = htole32(spl_length + SPL_HEADER_SIZE + SPL_KEY_SIZE);
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/* construct header */
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uint8_t hdr_buf[SPL_HEADER_SIZE];
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memset(hdr_buf, 0, SPL_HEADER_SIZE);
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memcpy(hdr_buf, &sig, sizeof(sig));
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hdr_buf[sizeof(sig)] = 1; /* ??? used in the FiiO M3K */
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/* create null key */
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uint8_t null_key[SPL_KEY_SIZE];
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memset(null_key, 0, SPL_KEY_SIZE);
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/* write everything out */
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if(fwrite(hdr_buf, SPL_HEADER_SIZE, 1, outfile) != 1)
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die("error writing output");
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if(fwrite(null_key, SPL_KEY_SIZE, 1, outfile) != 1)
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die("error writing output");
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if(fwrite(spl_code, spl_length, 1, outfile) != 1)
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die("error writing output");
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}
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uint8_t* read_input(const char* filename, uint32_t* rlength, int maxlen)
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{
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/* open file */
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FILE* f = fopen(filename, "rb");
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if(!f)
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die("cannot open input file: %s", filename);
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/* get size */
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fseek(f, 0, SEEK_END);
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int sz = ftell(f);
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/* check size */
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if(sz < 0)
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die("error seeking in input file");
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if(sz > maxlen)
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die("input is too big (size: %d, max: %d)", sz, maxlen);
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/* allocate buffer */
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uint8_t* buf = malloc(sz);
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if(!buf)
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die("out of memory");
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/* read file data */
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fseek(f, 0, SEEK_SET);
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if(fread(buf, sz, 1, f) != 1)
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die("error reading input file");
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/* close file */
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fclose(f);
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/* return buffer and size */
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*rlength = sz;
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return buf;
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}
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int main(int argc, const char* argv[])
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{
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/* variables */
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int flash_type = -1;
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int pages_per_block = -1;
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int bytes_per_page = -1;
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uint8_t* spl_code = NULL;
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uint32_t spl_length = 0;
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const char* outfile_name = NULL;
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for(int i = 1; i < argc; ++i) {
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if(strncmp(argv[i], "-type=", 6) == 0) {
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if(strcmp(argv[i]+6, "nand") == 0)
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flash_type = FLASH_TYPE_NAND;
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else if(strcmp(argv[i]+6, "nor") == 0)
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flash_type = FLASH_TYPE_NOR;
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else
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die("invalid type: %s", argv[i]+6);
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} else if(strncmp(argv[i], "-ppb=", 5) == 0) {
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pages_per_block = atoi(argv[i]+5);
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} else if(strncmp(argv[i], "-bpp=", 5) == 0) {
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bytes_per_page = atoi(argv[i]+5);
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} else if(spl_code == NULL) {
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spl_code = read_input(argv[i], &spl_length, SPL_CODE_SIZE);
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} else if(!outfile_name) {
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outfile_name = argv[i];
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} else {
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die("too many arguments: %s", argv[i]);
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}
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}
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if(flash_type < 0)
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die("must specify -type");
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if(flash_type == FLASH_TYPE_NAND) {
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if(pages_per_block < 0)
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die("must specify -ppb with -type nand");
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if(bytes_per_page < 0)
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die("must specify -bpp with -type nand");
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} else {
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pages_per_block = 0;
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bytes_per_page = 0;
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}
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if(spl_code == NULL)
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die("no input file given");
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if(!outfile_name)
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die("no output file given");
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FILE* outfile = fopen(outfile_name, "wb");
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if(!outfile)
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die("cannot open output file: %s", outfile_name);
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do_flash(spl_code, spl_length, flash_type,
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pages_per_block, bytes_per_page, outfile);
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fclose(outfile);
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return 0;
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}
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