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