Date: Tue, 6 Sep 2005 20:55:49 +0200 From: Hans Petter Selasky <hselasky@c2i.net> To: freebsd-usb@freebsd.org Cc: Mathieu PREVOT <mathieu-prevot@wanadoo.fr> Subject: Re: kernel panic with pure usb2umass pluged on pure usb1only motherboard port Message-ID: <200509062055.51077.hselasky@c2i.net> In-Reply-To: <a751adad46867a82adb4da6a698d14cc@wanadoo.fr> References: <a751adad46867a82adb4da6a698d14cc@wanadoo.fr>
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On Tuesday 06 September 2005 20:08, Mathieu PREVOT wrote:
> Hello,
>
> my kernel panics when I plug a pure USB2 umass. My motherboard has a
> VIA KT200 and has only USB1 ports.
> However, everything works perfectly with USB1 and USB1&2 umass.
> I used a custom kernel 5.4 but I noticed that behavior since 5.2.1. I
> not able to provide the output.
>
> Is it a known issue ?
There is one known bug in umass that will produce a panic on attach:
In "/sys/dev/usb/umass.c", maybe you can manually apply the following patch:
***************
*** 928,934 ****
#endif
if (sc->quirks & ALT_IFACE_1) {
! err = usbd_set_interface(0, 1);
if (err) {
DPRINTF(UDMASS_USB, ("%s: could not switch to "
"Alt Interface %d\n",
--- 929,935 ----
#endif
if (sc->quirks & ALT_IFACE_1) {
! err = usbd_set_interface(uaa->iface, 1);
if (err) {
DPRINTF(UDMASS_USB, ("%s: could not switch to "
"Alt Interface %d\n",
I am not sure if this is what is causing your panic.
But could you make sure that you have the following options in your kernel
config file:
options KDB # Enable kernel debugger support.
options DDB # Support DDB.
options GDB # Support remote GDB.
Then recompile the kernel, and then reproduce the panic. When the kernel
enters the debugger. Type "backtrace". Write down the function names, not all
the parameters, and post it.
--HPS
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