[U-Boot-Users] [PATCH] MPC83xx platform memory access performance improved

Kumar Gala galak at kernel.crashing.org
Tue May 30 17:30:28 CEST 2006

On May 30, 2006, at 12:06 AM, Liu Dave-r63238 wrote:

> Hi Wolfwang,
> Here is one patch which can make DMA performance improved 6x,
> memory write access performance improved 2.5x. and fixed some bugs.
> The change is:
> 1. Bus pipeline
> Set the CSB bus pipeline depth as 4, which makes 4 outstanding
> transcation on CSB bus.
> 2. Memory write
> When ECC enable, CPU write with 64bit. It makes DDR bus more  
> effective.

we need to be careful with this since not all 83xx have the ability  
to do 64bit writes (832x doesn't have FP)

> 3. DMA performance
> DMA transfer with cache line burst read and burst write.
> 4. ECC test
> I fixed some bugs in ECC test code, and enhanced the test code.
> 5. Platform clean up and bug fixed
> I clean up the start.S file, and change the comments which comes
> from 826x and 74xx.


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