Messages in this thread |  | | | Date | Fri, 14 Dec 2007 19:23:47 +0100 | | Subject | Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc. | | From | Rene Herman <> |
| |
On 14-12-07 19:02, H. Peter Anvin wrote:
> I believe this will suffer from the issue that was raised: this will use > udelay() long before loop calibration (and no, we can't just "be > conservative" since there is no "conservative" value we can use.) > > Worse, I suspect that at least the PIT, which may need to be used for > udelay calibration, is one of the devices that may be affected. I have > seen the Verilog for a contemporary chipset, and it can only access the > PIT once per microsecond -- this actually has to do with the definition > of the PIT; some of the PIT operations are ill-defined if allowed at a > higher frequency than the PIT clock.
Was reported before indeed:
http://linux.derkeiler.com/Mailing-Lists/Kernel/2003-09/5764.html
Rene.
|  |