On Wed, 25 Oct 2006 17:45:04 +0900 (JST), Atsushi Nemoto <anemo@xxxxxxxxxxxxx> wrote:
> > 2. Timekeeping is broken. The clock in /proc/driver/rtc seems correct, but
> > the system clock advances at about 1/16 of real time.
>
> Is this problem still happen if you disabled CONFIG_OPROFILE ?
I think I found the problem at last.
static struct clocksource clocksource_mips = {
.name = "MIPS",
.rating = 250,
.read = read_mips_hpt,
.shift = 24,
.is_continuous = 1,
};
This shift value is too large for ip27 HPT (1.25MHz).
temp = (u64) NSEC_PER_SEC << clocksource_mips.shift;
do_div(temp, mips_hpt_frequency);
clocksource_mips.mult = (unsigned)temp;
If mips_hpt_frequency is less than 0x1000000 (16777216), temp would be
larger than possible 32bit value. I'll cook a patch later but until
then you can use lesser shift value, for example, 20.
---
Atsushi Nemoto
