[PATCH] PowerPC: add setup_cpu for 44x for processor-specific init

Josh Boyer jwboyer at linux.vnet.ibm.com
Fri Sep 21 04:13:36 EST 2007

On Thu, 20 Sep 2007 21:55:58 +0400
Valentine Barshak <vbarshak at ru.mvista.com> wrote:

> This adds cpu_setup functionality to PowerPC 44x platform.
> The cpu_setup callback is invoked by head_32 code and 
> the identify_cpu() function at early init and is used to 
> initialize FPU on 440EP(x) processors. The FPU initialization 
> was previously done in head_44x.S. Also a workaround for 
> the incorrect write to DDR SDRAM 440EPx/440GRx errata added.
> Data can be written to wrong address in SDRAM when write 
> pipelining is enabled on plb0. The setup_cpu function
> for these processors disables write pipelining.

Wow, you're fast ;)

I'd like to see this split up a bit so there's not so much in one
patch.  Essentially, introduce cpu_setup_44x.S, move the FPU init to
use it, and then add the PLB workaround.

I still need to look at the code too :)


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