On Wed, Nov 12, 2014 at 02:35:04PM +0100, Christian Gmeiner wrote:
Some filesystems have a UUID stored in its superblock. To allow using root=UUID=... for the kernel command line we need a way to read-out the filesystem UUID.
changes rfc -> v1:
- make the environment variable an option parameter. If not given, the UUID is printed out. If given, it is stored in the env variable.
- corrected typos
- return error codes
changes v1 -> v2:
- fix return code of do_fs_uuid(..)
- document do_fs_uuid(..)
- implement fs_uuid_unsuported(..) be more consistent with the way other optional functionality works
changes v2 -> v3:
- change ext4fs_uuid(..) to make use of #if .. #else .. #endif construct to get rid of unreachable code
Hit any key to stop autoboot: 0 => fsuuid fsuuid - Look up a filesystem UUID
Usage: fsuuid <interface> <dev>:<part> - print filesystem UUID fsuuid <interface> <dev>:<part> <varname> - set environment variable to filesystem UUID
=> fsuuid mmc 0:1 d9f9fc05-45ae-4a36-a616-fccce0e4f887 => fsuuid mmc 0:2 eb3db83c-7b28-499f-95ce-9e0bb21cda81 => fsuuid mmc 0:1 uuid1 => fsuuid mmc 0:2 uuid2 => printenv uuid1 uuid1=d9f9fc05-45ae-4a36-a616-fccce0e4f887 => printenv uuid2 uuid2=eb3db83c-7b28-499f-95ce-9e0bb21cda81 =>
Signed-off-by: Christian Gmeiner christian.gmeiner@gmail.com Acked-by: Stephen Warren swarren@nvidia.com
Applied to u-boot/master, thanks!