[OLPC-devel] error report on usb8xxx with new kernel and firmware

[Dan Williams]

On Mon, 2006-09-11 at 12:42 +0700, supat at supat.eu.org wrote:
> Yes. I know what is build 81 is already.
> And my original report is correct. usb8xxx cause errors on slackware that 
> using build 81 under new Linux BIOS.
> 
> My suspect is some fire-up mechanism of slackware are different from OLPC 
> used. I notice it has /etc/module.d/blacklist under fedora to protect 
> kernel to probe the wrong VGA. Slackware do not have that mechanism.
> 
> If you gave me exactly mechanism to fire-up usb8xxx then I may be able to 
> solve or find out the problem.

When you say "fire-up", what do you mean?

When the kernel probes USB devices, it sees that the marvell device has
certain USB product & vendor IDs.  It then looks for modules that
support that specific USB P/V ID.  The usb8xxx driver does support the
USB P/V ID for the marvell device, and the kernel loads the usb8xxx
module.

The usb8xxx module determines that yes, it actually does support the
device in question.  Then, it calls request_firmware(), which is a
kernel function, to retrieve the firmware data from the filesystem.
request_firmware() generates a hotplug event, which runs udevsend in
userspace, which handles the firmware request.  The hotplug event is
handled by whatever executable the kernel is told to run for hotplug
requests, which is specified by telling /proc/sys/kernel/hotplug which
thing to run.  The firmware is then written back to a file in sysfs,
and, back in kernel space, that data is given back to the usb8xxx driver
on return from request_firmware().

Check you udev rules files (likely in /etc/udev/rules.d) and see how the
slackware udev handles firmware requests.  Ensure that your hotplug
setup is working correctly to call whatever slackware hotplug event
handling scripts there are for firmware.

Dan

> Conclusion: Yes. errors report earlier are reproducible under build 81.
> And I did use build 81 since at the beginning.
> 
> regards,
> supat
> 
> On Fri, 8 Sep 2006, James Cameron wrote:
> 
> > Have you been able to reproduce this on build 81 binaries?
> >
> > -- 
> > James Cameron    mailto:quozl at us.netrek.org     http://quozl.netrek.org/
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