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| author | Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com> | 2008-09-08 02:46:13 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-09-13 01:59:07 +0200 |
| commit | fc9c1727b5b3483ce49c3cb668e8332fb001b8a7 (patch) | |
| tree | 4225e1899157c007aebc19d150f62be9f04d11de /README | |
| parent | 508eb85db7065e34948c189c83f7e348c1cfd61e (diff) | |
| download | u-boot-fc9c1727b5b3483ce49c3cb668e8332fb001b8a7.tar.gz u-boot-fc9c1727b5b3483ce49c3cb668e8332fb001b8a7.tar.bz2 u-boot-fc9c1727b5b3483ce49c3cb668e8332fb001b8a7.zip | |
Add support for LZMA uncompression algorithm.
Signed-off-by: Luigi 'Comio' Mantellini <luigi.mantellini@idf-hit.com>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
Diffstat (limited to 'README')
| -rw-r--r-- | README | 23 |
1 files changed, 23 insertions, 0 deletions
@@ -1044,6 +1044,29 @@ The following options need to be configured: the malloc area (as defined by CFG_MALLOC_LEN) should be at least 4MB. + CONFIG_LZMA + + If this option is set, support for lzma compressed + images is included. + + Note: The LZMA algorithm adds between 2 and 4KB of code and it + requires an amount of dynamic memory that is given by the + formula: + + (1846 + 768 << (lc + lp)) * sizeof(uint16) + + Where lc and lp stand for, respectively, Literal context bits + and Literal pos bits. + + This value is upper-bounded by 14MB in the worst case. Anyway, + for a ~4MB large kernel image, we have lc=3 and lp=0 for a + total amount of (1846 + 768 << (3 + 0)) * 2 = ~41KB... that is + a very small buffer. + + Use the lzmainfo tool to determinate the lc and lp values and + then calculate the amount of needed dynamic memory (ensuring + the appropriate CFG_MALLOC_LEN value). + - MII/PHY support: CONFIG_PHY_ADDR |