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Re: [Patch] Simple USB hub support

From: address@hidden
Subject: Re: [Patch] Simple USB hub support
Date: Sun, 20 Jun 2010 13:25:46 -0500

On Sun, Jun 20, 2010 at 4:21 AM, Aleš Nesrsta <address@hidden> wrote:
> Hi,
> included patch should make USB hubs operational.
> It works in the same simple way as whole GRUB2 USB support, i.e. USB hub
> and device must be connected to computer BEFORE uhci/ohci module is
> loaded.
> Note (mainly for Vladimir):
> Via hub are normally working also devices which I reported to be not
> functional on UHCI. So, from my point of view it looks like there is
> surely some problem in powering of UHCI root hubs on my computer. But I
> still don't know why only some devices are sensitive to this problem
> (all of them are not big consumers of power).

When connected via USB-HS hub, even low-speed and full-speed devices
enumerate under the EHCI, not UHCI.  So it's not surprising that the
behavior changes and the devices start working.

Can you verify the speed of the devices in question, and that the hub
is USB 2.0 high-speed?

> Best regards
> Ales
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> address@hidden

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