[coreboot] [PATCH]USB Host Controller Drivers for libpayload

Anders Jenbo anders at jenbo.dk
Fri Aug 13 01:56:51 CEST 2010

Good work sofare :)

tor, 12 08 2010 kl. 16:35 +0200, skrev Patrick Georgi:
> Hi,
> attached patches add support for OHCI (USB1.1 in the non-intel/via
> flavor) and xHCI (USB3) to the libpayload USB stack.
> The code is the result of my Google Summer of Code project of this year.
> A big "Thank You!" to Google for sponsoring this effort, and the Summer
> of Code coordinators at Google for managing it.
> 0.improve-bus-scan:
> - Properly report the bus number to the user
> - Look if a device exists before iterating all its functions
> 1.ohci-driver:
> Interrupt transfers work fine with UHCI, but it seems not to be a good
> match for any other of the USB standards, so I'm looking at how to
> improve it.
> For this reason, the OHCI driver doesn't support interrupt transfers.
> This limitation affects keyboard operation. Mass storage (thumb drives,
> etc) are tested.
> 2.xhci-driver:
> xHCI is detected and does "basic" initialization (meaning: it does more
> complex things than the entire UHCI driver)
> Unfortunately my xHCI hardware, the xHCI specification and/or my
> understanding of either can't quite agree, so the driver is still
> missing a couple of things and thus is not working yet.
> The only user-visible capability (beyond printing lots of weird stuff on
> the debug channel) is reliable attach/detach detection.
> The patches must be applied in order due to their overlapping changes to
> common files.
> I'll continue to work on both drivers, but decided to post the code in
> the current form already, to prevent last-minute pressure before the
> Google Summer of Code deadline.
> Signed-off-by: Patrick Georgi <patrick at georgi-clan.de>
> -- 
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