Re: Kernel Panic during memcpy_toio to PCI card

From: Dave Jones (davej@codemonkey.org.uk)
Date: Fri Nov 01 2002 - 18:29:48 EST

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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 Jones.        http://www.codemonkey.org.uk
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Next message: Tom Rini: "Re: Where's the documentation for Kconfig?"
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