[U-Boot-Users] Decrementer timer do not works

[Yu Weiping]

I think Decrementer runs because every time I read the DEC register (SPR
22), different value returned.
 In the timer_interrupt, set_dec(decrementer_count) was called to reload the
value of DEC register. I also tried to change decrementer_count value to
100, and then the value of DEC register I read out will always smaller than
100 (I tried many times). if I mask the call of set_dec in timer_interrupt,
then I can read out big values (such as 0xFxxxxxxx, 0xExxxxxxx) for the DEC
register. From this test, I guess the timer_interrupt was called after the
exception generated. But the value of timestamp always be 0. It's hard to
believe since in timer_interrupt, after calling set_dec, timestamp++ should
be excuted.

 On 11/14/05, bbosch at iphase.com <bbosch at iphase.com> wrote:
>
> I don't have the data sheet in front of me at the moment, but I seem
> to recall that the 7447 has a hardware pin which must be strapped
> properly to enable the decrementer. U-Boot assumes the hardware is
> configured this way. Without the proper pull up or down resistor, the
> decrementer just does not run.
>
> --Brad
>
>
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