On Sun, 2008-03-09 at 13:55 +0000, Joel Soete wrote:
> Hello Grant,
>
> Always tracking this ccio-dma bug, I figure out this stuff could be helpfull:
> --- a/drivers/parisc/ccio-dma.c 2008-03-09 12:55:00.000000000 +0000
> +++ b/drivers/parisc/ccio-dma.c 2008-03-09 12:55:21.000000000 +0000
> @@ -802,7 +802,7 @@
> * Hopefully someone figures out how to patch (NOP) the
> * FDC/SYNC out at boot time.
> */
> - asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr[7]));
> + asm volatile("fdc %%r0(%0)" : : "r" (pdir_ptr));
That's the wrong fix. What it's trying to do is flush the write made
above this to pdir_ptr[7]. Therefore there should be an '&' in front,
so
asm volatile("fdc %%r0(%0)" : : "r" (&pdir_ptr[7]))
Flushing pdir_ptr may or may not work depending on the cache line width
(pdr_ptr[7] is 28 bytes away, so if the line size is 16 it will fail;
although I think almost every machine with a ccio has a 32 byte or
higher cache line width).
James
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