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SubjectRe: Problem with kernel-pll in 2.0.3x (at least)
On 30 Apr 98 at 23:37, Jon Peatfield wrote:

> I just found a problem with the kernel-pll in 2.0.34pre10 (well it
> hasn't changed since at least 2.0.33 as far as I can tell). It only
> affects Alpha hardware (though it would affect anything which has
> __KERNEL_HZ set to a value much larger than 100).
>
> On the alpha, asm-alpha/param.h defines __KERNEL_HZ to 1024 which is
> fine, so tick being the number of uS between clock updates is
> 977. (well it should be ~977.5 but...).
>
> However, which means that a single unit change in tick alters the
> speed of the clock by 1024ppm. Again this isn't a real problem, but
> linux/timex.h defines MAXFREQ as
>
> #define MAXFREQ (200L << SHIFT_USEC) /* max frequency error (ppm) */

Maybe the minimum should be dependent on HZ...


Patch proposals?

Regards,
Ulrich

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