On Wed, 17 Mar 2010 11:25:46 -0700 "H. Peter Anvin" <hpa@xxxxxxxxx> wrote: > On 03/17/2010 05:30 AM, Simon Kagstrom wrote: > > #ifdef __i386__ > > - outb(0xff, 0x080); > > + native_io_delay(); > > #endif > > There is something a lot more weird about this. First of all, it's > #ifdef'd out on all but __i386__ including x86-64; second, it looks like > this is specific to synchronizing to the IER. > > I'm wondering if the right thing isn't to add a dummy write to the SCR > register (or similar.) You just need a write to something on the ISA bus which is 'safe' so that you don't end up reading back what you wrote to an non-existant port as some old chipsets will return the last ISA result when you do this rather than 0xff. -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
