Jerry Van Baren wrote:
> Liu Dave-R63238 wrote:
>>> According to Ira, the DMA method was faster than the cpu method:
>>> "It makes the DMA initialization normal speed again. The DMA
>>> in the for loop takes the longest (as expected).
>>>
>>> So yes, strangely it (enabling the icache) makes a HUGE
Liu Dave-R63238 wrote:
>> According to Ira, the DMA method was faster than the cpu method:
>> "It makes the DMA initialization normal speed again. The DMA
>> in the for loop takes the longest (as expected).
>>
>> So yes, strangely it (enabling the icache) makes a HUGE
>> difference. The total tim
On Wed, Jul 08, 2009 at 07:32:26PM -0500, Peter Tyser wrote:
> On Thu, 2009-07-09 at 08:24 +0800, Liu Dave-R63238 wrote:
> > > When SDRAM ECC is enabled and CONFIG_ECC_INIT_VIA_DDRCONTROLLER is not
> > > defined use DMA to set SDRAM to a known state. Previously a
> > > sequence of
> > > 64-bit st
> According to Ira, the DMA method was faster than the cpu method:
> "It makes the DMA initialization normal speed again. The DMA
> in the for loop takes the longest (as expected).
>
> So yes, strangely it (enabling the icache) makes a HUGE
> difference. The total time is <3 seconds now. It is
On Thu, 2009-07-09 at 08:24 +0800, Liu Dave-R63238 wrote:
> > When SDRAM ECC is enabled and CONFIG_ECC_INIT_VIA_DDRCONTROLLER is not
> > defined use DMA to set SDRAM to a known state. Previously a
> > sequence of
> > 64-bit stores was used.
>
> IIRC, the DMA init SDRAM is slower than the 64bit s
> When SDRAM ECC is enabled and CONFIG_ECC_INIT_VIA_DDRCONTROLLER is not
> defined use DMA to set SDRAM to a known state. Previously a
> sequence of
> 64-bit stores was used.
IIRC, the DMA init SDRAM is slower than the 64bit stores.
It is why I added these code here.
I suggest to keep the way.
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