Eric Lee / smarc-uboot

23 Nov, 2014

1 commit

  • 59e890ef7   fs: make it possible to read the filesystem UUID ... Browse Code ยป

    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 :
    - print filesystem UUID
    fsuuid :
    - 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
    Acked-by: Stephen Warren

    Christian Gmeiner