I named the subject "interrupt problem", although I am not
completely sure it is really a problem with interrupts I'm
having. Anyway, the symptoms are the following:
- a ddb 5074 board with 3com boomerang ethernet pci card, boots
with initial ramdisk (ok)
- serial interrupts work (ok)
- ethernet card interrupts work when doing a "simple" ping
- flooding the card with network packets (ping -f) causes the
ddb board to hang/freeze/stall after an unpredictible amount of
time, without producing any output on the serial console.
- the problem does not seem to exist when I use a realtek ethernet
card (ne2k driver) in stead of the 3com card.
I've tried to remedy this by:
- replacing the low level interrupt handling code for ddb5074
with the new irq.c and time.c in arch/mips/kernel (needs
CONFIG_NEW_TIME_C and CONFIG_NEW_IRQ).
- replacing the timer interrupts with CPU timer interrupts.
- getting the newest 3c59x driver (although I don't have any
probs with this driver on pc).
- banging my head on the table.
No luck so far. I am a bit out of ideas on how to track down the
cause of this problem, so it would be really helpful if somebody
could either indicate a hint of a possible solution, or suggest
ways to debug this situation.