Hi Dave,
I am not sure if the problem is with memcpy_toio() itself because
I found that the kernel crash occurred even when I replaced the
memcpy_xxio() calls with readl() and writel(). The panic occured
during the memory transfer. We tried looking at the PCI bus
using an analyzer but found nothing wrong.
Thanks,
Suneeta
-----Original Message-----
From: Dave Jones
To: Matt D. Robinson
Cc: Donepudi, Suneeta; 'linux-kernel@vger.kernel.org'
Sent: 11/1/02 6:29 PM
Subject: Re: Kernel Panic during memcpy_toio to PCI card
On Fri, Nov 01, 2002 at 03:28:10PM -0800, Matt D. Robinson wrote:
>It still caused the crash in the same manner and at the same location.
>Could someone help me with pointers to where I should start looking ?
>Disabling interrupts around the memcpy_toio() did not make any
>difference. Is this a hardware problem with the PCI card ? We are
using
>a Xilinx core with out FPGA build into it.
memcpy_toio() in 2.4 is still using memcpy() which could use prefetch()
if you compile for certain processors. Prefetching io space could do
all sorts of nasties.
2.5 changed this define (in include/asm-i386/io.h) to use __memcpy
instead, which doesn't use prefetching.
Dave
Dave
-- | Dave Jones. http://www.codemonkey.org.uk - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Thu Nov 07 2002 - 22:00:26 EST