On Wed, Jul 08, 2009 at 03:31:29PM -0700, Ira W. Snyder wrote:
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?
As a further quick note, I just hacked in support for initializing the DDR via the DDR controller. Nothing good for submission, but it works fine for my board. (We're using fixed_sdram(), no SPD code).
The DDR controller takes about 3 seconds to initialize all 256MB of RAM on the board.
Ira