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cmd_nand: add nand write.trimffs command

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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>
This commit is contained in:
Ben Gardiner
2011-06-14 16:35:07 -04:00
committed by Scott Wood
parent 169d54d8b3
commit c9494866df
2 changed files with 26 additions and 0 deletions
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10
doc/README.nand
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@@ -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