Messages in this thread | | | Date | Sat, 15 Dec 2007 14:29:29 +0000 | From | Alan Cox <> | Subject | Re: [PATCH] x86_64: fix problems due to use of "outb" to port 80 on some AMD64x2 laptops, etc. |
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On Sat, 15 Dec 2007 14:27:25 +0100 Ingo Molnar <mingo@elte.hu> wrote:
> > * Rene Herman <rene.herman@gmail.com> wrote: > > > The issue is -- how do you safely replace the outb pre-loops_per_jiffy > > calibration? I'm currently running with the attached hack (not > > submitted, only for 32-bit and discussion) the idea of which might be > > the best we can do? > > how about doing a known-NOP chipset cycle? For example: > > inb(PIC_SLAVE_IMR)
It needs tobe a different chip to the main one (or macrocell anyway) - so PIC for PIT and vice versa. However since we know 0x80 works for everything on the planet but this one specifies of laptop which seems to need a firmware update its a very high risk approach.
Alan
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