Re: Fatal trap 19: non-maskable interrupt trap while in kernel m
I think what is going on is that the probe code is unmasking the
transmit and receive channel interrupts in order to probe the number
of available channels, without first clearing any 'garbage' status
pending on those channel(s). Such status might occur from, e.g. the BIOS
playing with the firewire controller before booting the system.
This could result in an immediate interrupt which crashes the machine
before the driver has had a chance to program the interrupt vector.
If that is what is going on, then this patch should fix the problem.
But it needs to be tested. It doesn't crash my test box but we need to
find out if it fixes the reported problem.
Gabor, from your latest email it looks like neither NetBSD nor OpenBSD
are running a firewire driver, so it is possible that they also have
the bug but it isn't being hit.
If you have the ability to download an ISO and burn it onto a CD to
boot/test the fix I could generate an ISO image for you to try with this
patch. It may or may not work but it is worth a shot.
-Matt
Index: fwohci.c
===================================================================
RCS file: /cvs/src/sys/bus/firewire/fwohci.c,v
retrieving revision 1.8
diff -u -r1.8 fwohci.c
--- fwohci.c 2 Jun 2004 14:42:48 -0000 1.8
+++ fwohci.c 5 Nov 2004 20:11:34 -0000
@@ -613,14 +613,17 @@
}
/* Available Isochrounous DMA channel probe */
+ OWRITE(sc, OHCI_IT_STATCLR, 0xffffffff);
+ OWRITE(sc, OHCI_IR_STATCLR, 0xffffffff);
OWRITE(sc, OHCI_IT_MASK, 0xffffffff);
OWRITE(sc, OHCI_IR_MASK, 0xffffffff);
reg = OREAD(sc, OHCI_IT_MASK) & OREAD(sc, OHCI_IR_MASK);
OWRITE(sc, OHCI_IT_MASKCLR, 0xffffffff);
OWRITE(sc, OHCI_IR_MASKCLR, 0xffffffff);
- for (i = 0; i < 0x20; i++)
+ for (i = 0; i < 0x20; i++) {
if ((reg & (1 << i)) == 0)
break;
+ }
sc->fc.nisodma = i;
device_printf(dev, "No. of Isochronous channel is %d.\n", i);
if (i == 0)
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