[U-Boot] [PATCH] 85xx: Using proper I2C source clock divider for MPC8544

Kumar Gala galak at kernel.crashing.org
Tue Oct 14 23:04:04 CEST 2008


>>>> thanks.  How did you do the measurements that got you this 1.5x  
>>>> factor?
>>>
>>> This afternoon I re-measured the I2C bus clock frequency with the
>>> oscilloscope at the I2C clock line on our Socrates MPC8544 board.  
>>> With
>>> the patch applied, I measured the correct frequency of 100 kHz.  
>>> Without,
>>> it was a factor of 1.5 too high.
>>
>> are you able to change cfg_seq_freq on the board?
>
> At least I don't know how. It's defined via hardware strap, I imagine.

Its is.. not sure if you have schematics for the board.  If you do  
look to see if LWE_B is wired to anything.

- k


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