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562274730a
Align the DFU MTD backend for the UBI partitions with the mtd command write
behavior when the option .dontskipff is not used: don't write the empty
pages (full of 0xFF); it is not required for UBI, see [1] for details.
This patch avoids the "free space fixup" procedure in the kernel [2]
and allows to program a UBIFS volume generated by mkfs.ubifs without the
option -F, --space-fixup.
The MTD DFU backend implements this behavior introduced on DFU NAND
backend by the commit 13cb7cc9e8e4 ("dfu: Add option to skip empty pages
when flashing UBI images to NAND") and also supported by the command nand
by CONFIG_CMD_NAND_TRIMFFS and by commit c9494866df83 ("cmd_nand: add nand
write.trimffs command").
[1] http://www.linux-mtd.infradead.org/doc/ubi.html#L_flasher_algo
[2] http://www.linux-mtd.infradead.org/faq/ubifs.html#L_free_space_fixup
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>