Messages in this thread | | | From | "Donepudi, Suneeta" <> | Subject | RE: Kernel Panic during memcpy_toio to PCI card | Date | Sat, 2 Nov 2002 14:46:17 -0500 |
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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
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