On Wed, 17 Oct 2007, Giuseppe Sacco wrote:
Hi all, I am still testing new kernels on the ip32 platform (and
learning kernel structure :-)). Currently I found problems in writing to
USB block devices. I may read from a pendrive without problem, but when
I try to write the process stop. This is the last part of a transcript
of strace output for "pvcreate /dev/sdc" command:
A few questions...
* Which USB card, or more precisely, which chipset is on the USB card you
picked?
I've had great luck with NEC and ALI chips thus far.
* Which driver was loaded for the USB controller, OHCI, UHCI, EHCI?
If you have a USB 2.0 controller, the system will probably try to load
both EHCI and UHCI. I did run into problems there, for one, the system
crashed when I pulled the thumb drive out. It sometimes behaved strangely
when it was in. I eventually figured out that removing UHCI and running
EHCI only was the solution for me. The UHCI module seemed to be probing
the hardware incorrectly. It was reporting 6 ports on the bridge when
there were only 2. The EHCI module was reporting the correct number as I
recall. Once it was EHCI only, I've never had a problem since.
That was originally under 2.6.17 from gentoo. I've since been using the
debian patched 2.6.18. I'm afraid I haven't yet reached sufficient
motivation to move into the 20's like the rest of you. I tend to like my
box working... :) Just joking.....it's on the todo list.
-S-
