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author | fishsoupisgood <github@madingley.org> | 2019-04-29 01:17:54 +0100 |
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committer | fishsoupisgood <github@madingley.org> | 2019-05-27 03:43:43 +0100 |
commit | 3f2546b2ef55b661fd8dd69682b38992225e86f6 (patch) | |
tree | 65ca85f13617aee1dce474596800950f266a456c /roms/u-boot/doc/README.cfi | |
download | qemu-master.tar.gz qemu-master.tar.bz2 qemu-master.zip |
Diffstat (limited to 'roms/u-boot/doc/README.cfi')
-rw-r--r-- | roms/u-boot/doc/README.cfi | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/roms/u-boot/doc/README.cfi b/roms/u-boot/doc/README.cfi new file mode 100644 index 00000000..d087ff0d --- /dev/null +++ b/roms/u-boot/doc/README.cfi @@ -0,0 +1,29 @@ +The common CFI driver provides this weak default implementation for +flash_cmd_reset(): + +void __flash_cmd_reset(flash_info_t *info) +{ + /* + * We do not yet know what kind of commandset to use, so we issue + * the reset command in both Intel and AMD variants, in the hope + * that AMD flash roms ignore the Intel command. + */ + flash_write_cmd(info, 0, 0, AMD_CMD_RESET); + flash_write_cmd(info, 0, 0, FLASH_CMD_RESET); +} +void flash_cmd_reset(flash_info_t *info) + __attribute__((weak,alias("__flash_cmd_reset"))); + + +Some flash chips seems to have trouble with this reset sequence. In this case +the board specific code can override this weak default version with a board +specific function. For example the digsy_mtc board equipped with the M29W128GH +from Numonyx needs this version to function properly: + +void flash_cmd_reset(flash_info_t *info) +{ + flash_write_cmd(info, 0, 0, AMD_CMD_RESET); +} + +see also: +http://www.mail-archive.com/u-boot@lists.denx.de/msg24368.html |