Re: [microblaze-uclinux] Ethernet update for David Banas' NuHorizonsboard project

[John Williams <jwilliams@xxxxxxxxxxxxxx>]

Hi Mike,

Mike wrote:

>>Mike,
>>
>>How'd you get the design to meet timing closure at 67 MHz? When I 
>>look at my timing report for a 50 MHz clock, it shows that I just barely made it!
>>
>>David Banas

>   The other problem seems to be OS timing, at least.  
> After the speed change, my reported Dhrystones went down
> slightly.  14xxx to 13xxx.  I think that it is really faster, but the
> OS does not know that the period of the system timer has
> changed.

Under auto-config, the kernel gets the system clock frequency from the 
MSS file, specifically the parameter C_CORE_CLOCK_FREQ which lives in 
the PROCESSOR section of the MSS file.

Regards,

John


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