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RE: Missing USB devices.
From: |
Melki Christian (consultant) |
Subject: |
RE: Missing USB devices. |
Date: |
Wed, 28 Aug 2013 06:59:01 +0000 |
Ales,
I'm thinking of the EHCI hand-over. In the case of EHCI handover beeing
successful within the timeout, you never clear the USBLEGCTLSTS register
(SMI's). You do that in the other cases however. Why? I can not think of any
case of a successful handover with SMI's still enabled. To what purpose? A
buggy BIOS would maybe act upon such stuff? Maybe thats a case for lost devices
etc?
Also, I've been toying with the black magic EHCI hand-back. I've gotten it to
work for some machines. The problem with GRUB and USB is that if you enable USB
you have no more control over USB in case a OS needs input before loading it's
own USB stack. Do you have any experience with this? Could we make such code
execution optional on environment etc (because hand back is even more buggy
than everything else.. :)) Maybe users can use it in corner cases when they
need USB-input with usb-support in GRUB... if it'll work on their hardware that
is.
Regards,
Christian
- Missing USB devices., Melki Christian (consultant), 2013/08/07
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- Re: Missing USB devices., Aleš Nesrsta, 2013/08/09
- Re: Missing USB devices., Aleš Nesrsta, 2013/08/09
- RE: Missing USB devices., Melki Christian (consultant), 2013/08/27
- Re: Missing USB devices., Aleš Nesrsta, 2013/08/27
- Re: Missing USB devices., Vladimir 'φ-coder/phcoder' Serbinenko, 2013/08/27
- Re: Missing USB devices., Aleš Nesrsta, 2013/08/30
- RE: Missing USB devices.,
Melki Christian (consultant) <=
- Re: Missing USB devices., Aleš Nesrsta, 2013/08/31
- [PATCH] Re: Missing USB devices., Aleš Nesrsta, 2013/08/31
- [PATCH] Re: Missing USB devices., Aleš Nesrsta, 2013/08/31