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 stores. > It is why I added these code here. > > I suggest to keep the way.
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 now faster than the previous CPU method." Logically the DMA method should be faster, and Ira's results seem to reinforce this. I don't have an 83xx board to test on, so let me know if others have different results than Ira. Best, Peter _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
