Atsushi Nemoto wrote:
>
> Hmm, do the TIMER1 and CP0_COUNTER run at same speed? If no, the
> PNX8550 port should be broken (i.e. gettimeofday() did not work
> properly) even without the timer API changes. You should provide
> custom clocksource.mips_read (previously named mips_hpt_read) function
> which returns TIMER1 counter value. If the TIMER1 was not 32-bit
> free-run counter, some trick would be required. Refer sb1250 or
> jmr3927 for example.
>
> ---
> Atsushi Nemoto
>
>
>
I am just starting to look into this (thankyou for your first comments).
I have reduced the problem code, so if I change the following:
/* For use both as a high precision timer and an interrupt source. */
static void __init c0_hpt_timer_init(void)
{
expirelo = read_c0_count() + cycles_per_jiffy;
write_c0_compare(expirelo);
} (the 2.6.19 version)
to the following:
/* For use both as a high precision timer and an interrupt source. */
static void __init c0_hpt_timer_init(void)
{
unsigned int count = read_c0_count() - mips_hpt_read();
expirelo = (count / cycles_per_jiffy + 1) * cycles_per_jiffy;
write_c0_count(expirelo - cycles_per_jiffy);
write_c0_compare(expirelo);
write_c0_count(count);
}
Then i get the system to boot up and all seems well. I am new to this and
am looking into why this change makes the system boot up. As always though
any help is appreciated.
Cheers
Dan
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