powerpc mvme5500 clock off by factor of 150

Peter Dufault dufault at hda.com
Mon Mar 7 12:41:25 UTC 2005

On Mar 6, 2005, at 3:20 PM, Peter Dufault wrote:

> The clock on the MVME5500 seems to be off by a factor of 150...

Here's what I've figured out this AM.

The clock code that's used is the code in libcpu/powerpc/mpc6xx/clock.

The clockIsr is going off every 57.9 seconds.

In Clock_initialize the values are:
BSP_bus_frequency 133333333 (correct)
BSP_time_base_divisor 4000
rtems_configuration_get_microseconds_per_tick() 10000
Clock_Decrementer_value 333330

What is that loop in clockIsr doing where it loops until decr < 0?


Peter Dufault
HD Associates, Inc.

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