Re: [PATCH] libata: Add MMIO support to pata_sil680

[Jeff Garzik <jeff@garzik.org>]

Alan Cox wrote:
>> #define DELAY400NS  { pio_inbyte( CB_ASTAT ); pio_inbyte( CB_ASTAT );  \
>>                        pio_inbyte( CB_ASTAT ); pio_inbyte( CB_ASTAT ); }
>>
>>
> 
> Totally unrelated. Hal is using the cycle time of the four I/O reads to
> do the 400nS delay. Its a neat way to do the delay on boxes without
> modern CPUs and nice timing features and perhaps one we should use on
> those boxes but its not relevant to the question of how you post an MMIO
> command write.

It illustrates (as well as our experience to date) that AltStatus use 
for the delay is just fine.

	Jeff