| 1 | /* |
| 2 | * LZMA compressed kernel decompressor for bcm947xx boards |
| 3 | * |
| 4 | * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License, or |
| 9 | * (at your option) any later version. |
| 10 | * |
| 11 | * This program is distributed in the hope that it will be useful, |
| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | * General Public License for more details. |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License |
| 17 | * along with this program; if not, write to the Free Software |
| 18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 19 | * |
| 20 | */ |
| 21 | |
| 22 | The code is intended to decompress kernel, being compressed using lzma utility |
| 23 | build using 7zip LZMA SDK. This utility is located in the LZMA_Alone directory |
| 24 | |
| 25 | decompressor code expects that your .trx file consist of three partitions: |
| 26 | |
| 27 | 1) decompressor itself (this is gziped code which pmon/cfe will extract and run |
| 28 | on boot-up instead of real kernel) |
| 29 | 2) LZMA compressed kernel (both streamed and regular modes are supported now) |
| 30 | 3) Root filesystem |
| 31 | |
| 32 | Please be sure to apply the following patch for use this new trx layout (it will |
| 33 | allow using both new and old trx files for root filesystem lookup code) |
| 34 | |
| 35 | --- linuz/arch/mips/brcm-boards/bcm947xx/setup.c 2005-01-23 19:24:27.503322896 +0300 |
| 36 | +++ linux/arch/mips/brcm-boards/bcm947xx/setup.c 2005-01-23 19:29:05.237100944 +0300 |
| 37 | @@ -221,7 +221,9 @@ |
| 38 | /* Try looking at TRX header for rootfs offset */ |
| 39 | if (le32_to_cpu(trx->magic) == TRX_MAGIC) { |
| 40 | bcm947xx_parts[1].offset = off; |
| 41 | - if (le32_to_cpu(trx->offsets[1]) > off) |
| 42 | + if (le32_to_cpu(trx->offsets[2]) > off) |
| 43 | + off = le32_to_cpu(trx->offsets[2]); |
| 44 | + else if (le32_to_cpu(trx->offsets[1]) > off) |
| 45 | off = le32_to_cpu(trx->offsets[1]); |
| 46 | continue; |
| 47 | } |
| 48 | |
| 49 | |
| 50 | Revision history: |
| 51 | 0.02 Initial release |
| 52 | 0.03 Added Mineharu Takahara <mtakahar@yahoo.com> patch to pass actual |
| 53 | output size to decoder (stream mode compressed input is not |
| 54 | a requirement anymore) |
| 55 | 0.04 Reordered functions using lds script |
| 56 | |
