[U-Boot] [PATCH] usb: Add support for multiple-LUN mass storage devices

[Ludovic Courtès]

Hi,

ludo at gnu.org (Ludovic Courtès) writes:

> The request sense KCQ can be interpreted as ‘Not Ready - Medium Not
> Present’, according to
> <https://secure.wikimedia.org/wikipedia/en/wiki/KCQ>, despite the fact
> that the SD card is actually in (and Linux can successfully read from
> it.)
>
> The card reader has USB IDs 05e3:0726 (Genesys Logic).

The problem was that this card reader exposes two SCSI logical units
(LUNs), whereas the code in ‘usb_storage.c’ assumed single-LUN devices
(which is typically the case with USB keys and disks.)

The patch below adds support for multiple-LUN devices like this one.
Tested on the GuruPlug.

The net effect for the GuruPlug is that it makes it possible to boot a
kernel stored on a microSD card, something long overdue [0, 1].

Can you please review and apply?

Thanks,
Ludo’.

[0] http://plugcomputer.org/plugforum/index.php?topic=1642

[1] It really feels like I’m doing GlobalScale’s or Marvell’s job here.
    It looks like GlobalScale is steadily strengthening its reputation
    of being incompetent.  Keep up the bad work!

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