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
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