* Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote:
> >
> >> +static void xdbc_runtime_delay(unsigned long count)
> >> +{
> >> + udelay(count);
> >> +}
> >> +static void (*xdbc_delay)(unsigned long) = xdbc_early_delay;
> > Is this udelay() complication really necessary? udelay() should work fine even in
> > early code. It might not be precisely calibrated, but should be good enough.
>
> I tried udelay() in the early code. It's not precise enough for the
> hardware handshaking.
Possibly because on x86 early udelay() did not work at all - i.e. there's no delay
whatsoever.
Could you try it on top of this commit in tip:timers/core:
4c45c5167c95 x86/timer: Make delay() work during early bootup
?
Thanks,
Ingo
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