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RE: USB Driver uhci.c legacy mode
From: |
D, Eshwar (Eshwar) |
Subject: |
RE: USB Driver uhci.c legacy mode |
Date: |
Tue, 27 Jul 2010 10:24:09 +0530 |
HI,
I would like to contribute for EHCI driver.. Let me know if any space is
available for me... By the way I already spoke to Ales & Vladimir...
Regards
Eshwar
> -----Original Message-----
> From: address@hidden
> [mailto:address@hidden
> ] On Behalf Of Aleš Nesrsta
> Sent: Saturday, July 24, 2010 11:45 PM
> To: The development of GNU GRUB
> Subject: Re: USB Driver uhci.c legacy mode
>
> Hi, I am sorry to be late with answer, unfortunately, I have
> few time during our school holidays...
> To Your questions, chronologically:
>
> > how would i surely know that grub usb driver would not work on this
> > platform?
>
> None of current USB drivers will work if Your PC is EHCI-only
> PC. One way how to find it I described before (via lspci).
> But You have to be sure You have properly set USB part in
> BIOS (or You should try all possible USB BIOS configurations
> etc. ...).
> Another way is for example to find detailed specification of
> Your laptop HW. I tried shortly to find something on Internet
> but there are specifications like "USB 2.0 compatible" etc.
> and the same specifications are often used also for
> controllers which includes OHCI/UHCI USB 1.0 too - so, I am not sure.
>
> Definitely You can find it by check of HCSPARAMS register of EHCI.
> According EHCI specification, this 32-bit register should be
> at USBBASE
> + 08h (USBBASE pointer should be in PCI configuration registers at PCI
> base + 10h).
> Bits 15:12 of HCSPARAMS should be nonzero. If You find zero
> there, You have EHCI-only controller (without OHCI/UHCI
> companion controllers) in Your PC, i.e., Your USB controller
> is currently not directly supported by GRUB :-(
>
>
> > jonatan perry wrote:
> > i have another question regarding grub usb ehci support - is such
> > support under development? is such support are planned to
> be? what is
> > the current status?
>
> Hm, I am not the right person to answer these questions
> properly, I am not coordinator... Maybe Vladimir Serbinenko
> will answer it better.
>
> >From my point of view:
> - Development of EHCI is planned.
> - Current status of EHCI driver development - probably 0%.
> AFAIK, nobody is currently working on EHCI support. But I
> could be wrong and it can change at any time.
>
> I was asked some months ago by Vladimir, if I am interesting
> also in EHCI. I answered "no" originally - because I thought
> that all EHCI controllers have also companion OHCI/EHCI
> controllers and speed of USB
> 1.0/1.1 devices is not critical for GRUB (because it is "only"
> bootloader...).
> I changed point of view from some reasons short time ago. I
> wanted, at least, find why some devices are not working on my
> EHCI/UHCI port - it looks like problem is on powering of
> ports (but UHCI has no power control of its ports - or, at
> least, it is not written in UHCI specification...). I think
> that this problem is maybe somewhere in EHCI, so I want to
> start some experiments with EHCI.
>
> But:
> - GRUB USB development is currently focused on enhancement
> and debugging of current USB drivers and related code - for
> example hot-plugging and hub support. I want to help with
> these things first before doing something new (and generate
> new bugs...).
> - EHCI is different and more complex than OHCI/UHCI
> - it looks like I will too busy in next weeks/months. So, if
> EHCI support will depend only on me, it will take very long
> time... Maybe somebody else will start development of EHCI
> driver sooner (or maybe it is started?)...?
>
> With regards
> Ales
>
>
>
>
> _______________________________________________
> Grub-devel mailing list
> address@hidden
> http://lists.gnu.org/mailman/listinfo/grub-devel
>
- USB Driver uhci.c legacy mode, jonatan perry, 2010/07/02
- Re: USB Driver uhci.c legacy mode, Vladimir 'φ-coder/phcoder' Serbinenko, 2010/07/02
- Re: USB Driver uhci.c legacy mode, Aleš Nesrsta, 2010/07/05
- Re: USB Driver uhci.c legacy mode, jonatan perry, 2010/07/05
- Re: USB Driver uhci.c legacy mode, Aleš Nesrsta, 2010/07/05
- Re: USB Driver uhci.c legacy mode, jonatan perry, 2010/07/10
- Re: USB Driver uhci.c legacy mode, jonatan perry, 2010/07/12
- Re: USB Driver uhci.c legacy mode, Aleš Nesrsta, 2010/07/24
- RE: USB Driver uhci.c legacy mode,
D, Eshwar (Eshwar) <=