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authorPaul Burton <paul.burton@imgtec.com>2013-09-04 15:16:59 +0100
committerScott Wood <scottwood@freescale.com>2013-10-09 12:52:22 -0500
commitcc734f5ab26134e5e8d57c34edc257c89ac5b1d2 (patch)
treeb93b84751b3164934db82f76c5d33df366277dee /doc/README.ubi
parentdd7185f1764fb8ed93940c2ac44cd6c400ebae7e (diff)
cmd_ubi: add write.part command, to write a volume in multiple parts
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>
Diffstat (limited to 'doc/README.ubi')
-rw-r--r--doc/README.ubi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/README.ubi b/doc/README.ubi
index 3cf4ef232d3..d82c75c8484 100644
--- a/doc/README.ubi
+++ b/doc/README.ubi
@@ -14,6 +14,8 @@ ubi part [part] [offset]
ubi info [l[ayout]] - Display volume and ubi layout information
ubi create[vol] volume [size] [type] - create volume name with size
ubi write[vol] address volume size - Write volume from address with size
+ubi write.part address volume size [fullsize]
+ - Write part of a volume from address
ubi read[vol] address volume [size] - Read volume to address with size
ubi remove[vol] volume - Remove volume
[Legends]
@@ -77,6 +79,7 @@ ubi createvol Create UBI volume on UBI device
ubi removevol Remove UBI volume from UBI device
ubi read Read data from UBI volume to memory
ubi write Write data from memory to UBI volume
+ubi write.part Write data from memory to UBI volume, in parts
Here a few examples on the usage: