the following patch was just integrated into master:
commit 69eea7c01af0ce095aa7618eadae72e86f6eebbe
Author: Julius Werner <[email protected]>
Date: Fri Jan 11 16:25:52 2013 -0800
libpayload: Split EHCI bulk transfers on packet boundaries over qTDs
EHCI controllers see transfers as a queue of transfer descriptors
(qTDs), each of which can represent an aligned area of up to 20KB. Each
qTD is processed separately, which means that a single USB packet cannot
span multiple qTDs.
While this should not be a problem according to the specification, some
USB storage devices seem to get confused when a packet in the middle of
a transfer is smaller than the maximum packet size (512 bytes) due to
falling on a qTD boundary. This patch aligns the total transfer length
per qTD to 512 bytes to avoid that problem (any excess bytes will simply
roll over to the next qTD).
Change-Id: I0b5db07507699a3861b30c1a5ee774c45dda7fdd
Signed-off-by: Julius Werner <[email protected]>
Reviewed-on: http://review.coreboot.org/2651
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <[email protected]>
Reviewed-by: Paul Menzel <[email protected]>
Reviewed-by: Ronald G. Minnich <[email protected]>
Reviewed-By: Patrick Georgi <[email protected]> at Tue Mar 12 10:20:11
2013, giving +1
Build-Tested: build bot (Jenkins) at Tue Mar 12 03:59:50 2013, giving +1
Reviewed-By: Ronald G. Minnich <[email protected]> at Wed Mar 13 23:08:10
2013, giving +2
See http://review.coreboot.org/2651 for details.
-gerrit
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