Hi,
I'm currently investigating a problem of one of our customers. He is using
the dabusb-device/driver in conjunction with usb-ohci on a PC104-board by
Jumptec (MOBSlcd6). The board has a Pentium266MMX and an ALi Chipset
(M1531), the USB controller is the ALi M5237.
I know that dabusb+usb-ohci runs stable on other OHCIs (SIS/AMD etc), but
this board shows a few ugly effects (I've tested it with 2.4.18, 2.2.19 is
also affected according to our customer):
- Isochronous streaming with dabusb (~384kbyte/s) stops after a few minutes
since a submitted URB never completes (no race in dabusb, I've monitored
submits and completions).
- If bulk transfers (<1kbyte/s) are concurrently running with the
iso-streaming, the bulk transfers submits fail now and then with EINVAL.
- With concurrent bulk and iso, the system crashes after a few minutes with
an oops cascade with a never ending call trace in the end.
I have never seen such problems in any other application using dabusb and
usb-uhci or usb-ohci.
These symptoms smell like memory corruption, but a memory test showed no
problems...
Any ideas?
--
Georg Acher, [EMAIL PROTECTED]
http://www.in.tum.de/~acher/
"Oh no, not again !" The bowl of petunias
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