U-Boot now supports the "skip_check" flag to optionally skip the CRC
check at open time. Currently its only possible to set this bit upon
UBI volume creation. But it might be very useful to also set this bit
on already installed systems (e.g. field upgrade) to make also use of
the boot-time decrease on those systems.
This patch now adds a new "ubi" command "ubi skipcheck" to set or clear
this bit in the UBI volume header:
=> ubi skipcheck rootfs0 on
Setting skip_check on volume rootfs0
BTW: This saves approx. 10 seconds Linux bootup time on a MT7688 based
target with 128MiB of SPI NAND.
Signed-off-by: Stefan Roese <sr@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
Cc: Quentin Schulz <quentin.schulz@bootlin.com>
Cc: Boris Brezillon <boris.brezillon@collabora.com>
Cc: Heiko Schocher <hs@denx.de>
Cc: Andreas Dannenberg <dannenberg@ti.com>
This allows you to write data to an UBI volume when the amount of memory
available to write that data from is less than the total size of the
data. For example, you may split a root filesystem UBIFS image into
parts, provide the total size of the image to the first write.part
command and then use multiple write.part commands to write the
subsequent parts of the volume. This results in a sequence of commands
akin to:
ext4load mmc 0:1 0x80000000 rootfs.ubifs.0
ubi write.part 0x80000000 root 0x08000000 0x18000000
ext4load mmc 0:1 0x80000000 rootfs.ubifs.1
ubi write.part 0x80000000 root 0x08000000
ext4load mmc 0:1 0x80000000 rootfs.ubifs.2
ubi write.part 0x80000000 root 0x08000000
This would write 384MiB of data to the UBI volume 'root' whilst only
requiring 128MiB of said data to be held in memory at a time.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Acked-by: Stefan Roese <sr@denx.de>
