On Wed, Jul 08, 2009 at 02:28:39PM -0500, Peter Tyser wrote:
These changes bring the 83xx SDRAM ECC initialization in line with the 85xx/86xx boards and also fixes a minor bug in fsl_dma.c.
I don't have any 83xx boards to test on, so it would be appreciated if someone with 83xx hardware that uses ECC could give the patches a shot.
It'd be nice if SDRAM could be initialized via the DDR controller with CONFIG_ECC_INIT_VIA_DDRCONTROLLER on the 83xx platform too, but I'm not going to tackle it:)
The patches also resolve the compile error Stefan brought up with non-freescale boards with CONFIG_ECC.
Peter Tyser (3): 83xx: Default to using DMA to initialize SDRAM 83xx: Added CONFIG_MEM_INIT_VALUE for boards with ECC fsl_dma: Fix SDRAM initial value
Something in this patch makes the ECC DDR initialization VERY slow. It used to take <5 seconds, now it takes ~20 seconds for the memory to initialize.
I wonder why the CPU method would be so much faster?
Other than the speed, I can confirm that it works as expected on my 8349emds-based board. I see no reason why there would be a problem on the mpc8349emds, though I cannot test on the eval board itself. I do not have an ECC SDRAM module.
Ira