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Diffstat (limited to 'target/image/brcm/lzma-loader/src/README')
| -rw-r--r-- | target/image/brcm/lzma-loader/src/README | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/target/image/brcm/lzma-loader/src/README b/target/image/brcm/lzma-loader/src/README new file mode 100644 index 0000000..16649e9 --- /dev/null +++ b/target/image/brcm/lzma-loader/src/README @@ -0,0 +1,55 @@ +/* + * 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 |