Subject: Re: how to crash a diskless client (i386)
To: None <email@example.com>
From: Manuel Bouyer <firstname.lastname@example.org>
Date: 05/10/1999 21:52:10
On Mon, May 10, 1999 at 10:21:39AM +0200, email@example.com wrote:
> kernel: protection fault trap, code=0
> Stopped in dd at _wdc_ata_bio_intr+0x372: repne insl %dx,%es:(%edi)
This is in bus_space_read_multi_4() I guess (it's inline, so doesn't appear
in the stack trace).
Do you get this immediatly after starting the command, or at random ?
Do you always get this same panic, at the same place
i386 experts: what does "protection fault trap" mean ? Is it because
the port couldn't be read, or because the memory couldn't be written ?
I suspect the 32bit I/O here, could you try to recompile a kernel with the
--- wdc_isa.c.orig Mon May 10 21:50:49 1999
+++ wdc_isa.c Mon May 10 21:51:01 1999
@@ -150,7 +150,7 @@
sc->sc_wdcdev.dma_finish = wdc_isa_dma_finish;
- sc->sc_wdcdev.cap |= WDC_CAPABILITY_DATA16 | WDC_CAPABILITY_DATA32 |
+ sc->sc_wdcdev.cap |= WDC_CAPABILITY_DATA16 |
sc->sc_wdcdev.PIO_cap = 0;
sc->wdc_chanptr = &sc->wdc_channel;
Manuel Bouyer <firstname.lastname@example.org>