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Author Topic: Is it possible to change CPU speed in U-Boot?  (Read 1056 times)
doragasu
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« on: July 05, 2010, 11:26:35 AM »
I have browsed U-Boot sources and it looks like it's not setting CPU speed. Is it possible to add support to change CPU speed in U-Boot? I'd like to use it for underclocking my GuruPlug...

I have browsed the 88F6281 Hardware Specifications and pages 67, 67 and 68 detail how to select the CPU, L2 and DDR speed using hardware pullups/pulldowns. Unfortunately, I can't find documentation detailing the PLL block and if it can be changed on the fly by modifying some registers. If anybody knows something about this, please help me.
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blueqoo0321
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« Reply #1 on: July 28, 2010, 08:20:33 AM »
Hi doragasu

It's possible.

Rebuild UBOOT DB version and you will find some thing.

Regards
 Grin
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