On 11/18/2013 02:32 AM, Stefano Babic wrote:
Hi Eric,
On 14/11/2013 22:28, Eric Nelson wrote:
I dont mind either way, but just an idea for discussion:
What do you say to implementing the DRAM controller programming in SPL? That way, we can even do proper DRAM calibration on boot and other such nice things. And we'd also get rid of these static magic numbers all around.
We can (and hopefully will very soon) implement some of the configuration in C under SPL, but we can't (and shouldn't) get rid of all of the magic numbers.
Some of these numbers come from testing large numbers of devices under a variety of temperature conditions. The best that the automagic calibration facilities can do is set things up based on nominal current conditions.
That said, I'm sure we can cut down on the total number.
My immediate goal is simply to set the stage for SPL and a single binary.
I agree on this roadmap. Of course, it will be very nice to allow runtime DDR calibration, but we can do this in a second step.
Thanks Stefano,
BTW, I did some additional work yesterday to complete the compilation of a single SPL image with multiple DDR configurations.
A V2 of this patch will be needed.
Regards,
Eric