Wolfgang Denk wrote:
> In message <[EMAIL PROTECTED]> you wrote:
>> The solution in the PowerPC world is to add a "eieio" or "sync"
>> instruction[1] appropriately[2], which prevents the bus interface unit
>> from reordering the memory operations.
>
> No, the solution for ALL architectures is to use the appropriate
> accessor macros which take care of such things (and probably contain
> calls like sync or similar).
>
> Best regards,
>
> Wolfgang Denk
Agreed.
If my theory is correct, Adrian has turned up a problem with the ARM
configuration that apparently only shows up for the PXA250. Or I'm
blowing smoke - nothing to see, move along.
The hairs on the back of my neck say it is a sync/bus interface unit
problem.
I don't know if it is significant, not being very intimately familiar
with ARM (and, in particular, the PXA250), but my quick grep turns up
./include/asm-arm/io.h and a quick browsing shows no syncs. The hairs
on the back of my neck are starting to ache. ;-)
static inline void sync(void)
{
}
#define __arch_getb(a) (*(volatile unsigned char *)(a))
gvb
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