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| author | Ben Gardiner <bengardiner@nanometrics.ca> | 2011-06-14 16:35:07 -0400 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2011-07-01 15:56:51 -0500 |
| commit | c9494866df835bcee68e17339aec1090faa704da (patch) | |
| tree | a1c782909c323bf839403dc3c0abb124567a99e2 /doc | |
| parent | 169d54d8b33b4d06d6f215e2b312a0b18f7909dc (diff) | |
| download | u-boot-c9494866df835bcee68e17339aec1090faa704da.tar.gz u-boot-c9494866df835bcee68e17339aec1090faa704da.tar.bz2 u-boot-c9494866df835bcee68e17339aec1090faa704da.zip | |
cmd_nand: add nand write.trimffs command
Add another nand write. variant, trimffs. This command will request of
nand_write_skip_bad() that all trailing all-0xff pages will be
dropped from eraseblocks when they are written to flash as-per the
reccommended behaviour of the UBI FAQ [1].
The function that implements this timming is the drop_ffs() function
by Artem Bityutskiy, ported from the mtd-utils tree.
[1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo
Signed-off-by: Ben Gardiner <bengardiner@nanometrics.ca>
CC: Artem Bityutskiy <dedekind1@gmail.com>
CC: Detlev Zundel <dzu@denx.de>
Acked-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.nand | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/doc/README.nand b/doc/README.nand index 8eedb6c4d7..751b693843 100644 --- a/doc/README.nand +++ b/doc/README.nand @@ -78,6 +78,16 @@ Commands: should work well, but loading an image copied from another flash is going to be trouble if there are any bad blocks. + nand write.trimffs addr ofs|partition size + Enabled by the CONFIG_CMD_NAND_TRIMFFS macro. This command will write to + the NAND flash in a manner identical to the 'nand write' command + described above -- with the additional check that all pages at the end + of eraseblocks which contain only 0xff data will not be written to the + NAND flash. This behaviour is required when flashing UBI images + containing UBIFS volumes as per the UBI FAQ[1]. + + [1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo + nand write.oob addr ofs|partition size Write `size' bytes from `addr' to the out-of-band data area corresponding to `ofs' in NAND flash. This is limited to the 16 bytes |