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README.svn-base

README.svn-base 2.4 KB
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  1. /*
    2. 

  2.  * LZMA compressed kernel decompressor for bcm947xx boards
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2005 by Oleg I. Vdovikin <oleg@cs.msu.su>
    5. 

  5.  *
    6. 

  6.  * This program is free software; you can redistribute it and/or modify
    7. 

  7.  * it under the terms of the GNU General Public License as published by
    8. 

  8.  * the Free Software Foundation; either version 2 of the License, or
    9. 

  9.  * (at your option) any later version.
    10. 

  10.  *
    11. 

  11.  * This program is distributed in the hope that it will be useful,
    12. 

  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
    13. 

  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
    14. 

  14.  * General Public License for more details.
    15. 

  15.  *
    16. 

  16.  * You should have received a copy of the GNU General Public License
    17. 

  17.  * along with this program; if not, write to the Free Software
    18. 

  18.  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
    19. 

  19.  *
    20. 

  20.  */
    21. 

  21. 

  22. The code is intended to decompress kernel, being compressed using lzma utility
    23. 

  23. build using 7zip LZMA SDK. This utility is located in the LZMA_Alone directory
    24. 

  24. 

  25. decompressor code expects that your .trx file consist of three partitions: 
    26. 

  26. 

  27. 1) decompressor itself (this is gziped code which pmon/cfe will extract and run
    28. 

  28. on boot-up instead of real kernel)
    29. 

  29. 2) LZMA compressed kernel (both streamed and regular modes are supported now)
    30. 

  30. 3) Root filesystem
    31. 

  31. 

  32. Please be sure to apply the following patch for use this new trx layout (it will
    33. 

  33. allow using both new and old trx files for root filesystem lookup code)
    34. 

  34. 

  35. --- linuz/arch/mips/brcm-boards/bcm947xx/setup.c        2005-01-23 19:24:27.503322896 +0300
    36. 

  36. +++ linux/arch/mips/brcm-boards/bcm947xx/setup.c        2005-01-23 19:29:05.237100944 +0300
    37. 

  37. @@ -221,7 +221,9 @@
    38. 

  38.                 /* Try looking at TRX header for rootfs offset */
    39. 

  39.                 if (le32_to_cpu(trx->magic) == TRX_MAGIC) {
    40. 

  40.                         bcm947xx_parts[1].offset = off;
    41. 

  41. -                       if (le32_to_cpu(trx->offsets[1]) > off)
    42. 

  42. +                       if (le32_to_cpu(trx->offsets[2]) > off)
    43. 

  43. +                               off = le32_to_cpu(trx->offsets[2]);
    44. 

  44. +                       else if (le32_to_cpu(trx->offsets[1]) > off)
    45. 

  45.                                 off = le32_to_cpu(trx->offsets[1]);
    46. 

  46.                         continue;
    47. 

  47.                 }
    48. 

  48. 

  49. 

  50. Revision history:
    51. 

  51. 	0.02	Initial release
    52. 

  52. 	0.03	Added Mineharu Takahara <mtakahar@yahoo.com> patch to pass actual
    53. 

  53. 		output size to decoder (stream mode compressed input is not 
    54. 

  54. 		a requirement anymore)
    55. 

  55. 	0.04	Reordered functions using lds script
    56.