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d5cf4a5aa4
The boot process on a WRT54GL works the following way: 1. CFE gets loaded by the boot rom from flash 2. CFE loads the loader from the flash and gzip uncompresses it 3. CFE starts the loader 4. The loader stores the FW arguments and relocates itself to BZ_TEXT_START (now 0x80600000) 5. The loader reads the Linux image from flash 6. The loader lzma decompresses the Linux image to LOADADDR (0x80001000) 7. The loader executes the uncompress Linux image at LOADADDR The BZ_TEXT_START was set to 0x80400000 before. When the kernel gets uncompressed and is bigger than BZ_TEXT_START - LOADADDR it overwrote the loader which was currently uncompressing it and made the board crash. Increase the BZ_TEXT_START my 2 MB to have more space for the kernel. Even on 16MB RAM devices the memory goes till 0x80FFFFFF so this should not be a problem. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> |
7 years ago | |
|---|---|---|
| .. | ||
| LzmaDecode.c | 14 years ago | |
| LzmaDecode.h | 14 years ago | |
| Makefile | 7 years ago | |
| README | 14 years ago | |
| decompress.c | 14 years ago | |
| decompress.lds.in | 14 years ago | |
| head.S | 8 years ago | |
| loader.lds.in | 14 years ago | |
README
/*
* LZMA compressed kernel decompressor for bcm947xx boards
*
* Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
*
* 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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
The code is intended to decompress kernel, being compressed using lzma utility
build using 7zip LZMA SDK. This utility is located in the LZMA_Alone directory
decompressor code expects that your .trx file consist of three partitions:
1) decompressor itself (this is gziped code which pmon/cfe will extract and run
on boot-up instead of real kernel)
2) LZMA compressed kernel (both streamed and regular modes are supported now)
3) Root filesystem
Please be sure to apply the following patch for use this new trx layout (it will
allow using both new and old trx files for root filesystem lookup code)
--- linuz/arch/mips/brcm-boards/bcm947xx/setup.c 2005-01-23 19:24:27.503322896 +0300
+++ linux/arch/mips/brcm-boards/bcm947xx/setup.c 2005-01-23 19:29:05.237100944 +0300
@@ -221,7 +221,9 @@
/* Try looking at TRX header for rootfs offset */
if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
bcm947xx_parts[1].offset = off;
- if (le32_to_cpu(trx->offsets[1]) > off)
+ if (le32_to_cpu(trx->offsets[2]) > off)
+ off = le32_to_cpu(trx->offsets[2]);
+ else if (le32_to_cpu(trx->offsets[1]) > off)
off = le32_to_cpu(trx->offsets[1]);
continue;
}
Revision history:
0.02 Initial release
0.03 Added Mineharu Takahara <mtakahar@yahoo.com> patch to pass actual
output size to decoder (stream mode compressed input is not
a requirement anymore)
0.04 Reordered functions using lds script