[coreboot-gerrit] Patch merged into coreboot/master: e30e4e7 libpayload: usbmsc: Implement limited LUN support

the following patch was just integrated into master:
commit e30e4e7efa8c56b134e85f235c8f315a6a2b583b
Author: Julius Werner 
Date:   Fri May 2 16:35:50 2014 -0700

libpayload: usbmsc: Implement limited LUN support

I always thought the support for multiple logical SCSI units in the USB
    mass storage class was a dead feature. Turns out that it's actually used
    by SD card readers that provide multiple slots (e.g. one regular sized
    and one micro-SD). Implementing perfect support for that would require a
    major redesign of the whole MSC stack, since the one device -> one disk
    assumption is deeply embedded in our data structures.

Instead, this patch implements a poor man's LUN support that will just
    cycle through all available LUNs (in multiple calls to usb_msc_poll())
    until it finds a connected device. This should be reasonable enough to
    allow these card readers to be usable while only requiring superficial
    changes.

Also removes the unused 'protocol' attribute of usb_msc_inst_t.

BRANCH=rambi?,nyan
    BUG=chrome-os-partner:28437
    TEST=Alternatively plug an SD or micro-SD card (or both) into my card
    reader, confirm that one of them is correctly detected at all times.

Original-Change-Id: I3df4ca88afe2dcf7928b823aa2a73c2b0f599cf2
    Original-Signed-off-by: Julius Werner 
    Original-Reviewed-on: https://chromium-review.googlesource.com/198101
    Original-Reviewed-by: Aaron Durbin 
    (cherry picked from commit 960534a20e4334772c29355bb0d310b3f41b31ee)
    Signed-off-by: Marc Jones

Change-Id: I39909fc96e32c9a5d76651d91c2b5c16c89ace9e
    Reviewed-on: http://review.coreboot.org/7904
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Edward O'Callaghan

See http://review.coreboot.org/7904 for details.

-gerrit