[coreboot] disabling bios usb stack

Антон Кочков anton.kochkov at gmail.com
Wed Aug 27 00:14:53 CEST 2014


Just checked some binaries - PEI USB driver is loading anyway, no
checking for any setup option, so I guess it will be very hard even
with the unpacking UEFI image and removing these drivers. Also in most
UEFI systems big part of USB driver working in SMM mode, so it will be
hard to patch this code on the fly.
Best regards,
Anton Kochkov.

On Wed, Aug 27, 2014 at 1:23 AM, Carl-Daniel Hailfinger
<c-d.hailfinger.devel.2006 at gmx.net> wrote:
> Hi Ron,
> Am 26.08.2014 00:22 schrieb ron minnich:
>> disabling the usb stack is the goal in this case.
> AFAIK it's called "USB keyboard support", "USB legacy support" or
> something similar in most BIOSes. This internally maps a USB keyboard to
> a virtual PS/2 keyboard and sometimes has quite a few issues. If that's
> what your friend meant, disabling it should be straightforward in the
> BIOS menu.
> However, if your friend is a victim of EFI, I fear he is beyond help
> except for trying coreboot.
> Regards,
> Carl-Daniel
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