[U-Boot-Users] 83xx DDR2 667Mhz memory

[Bruce_Leonard at selinc.com]

> 
> Any ideas? Again, same exact u-boot just different memory. SPD sees it 
all
> just fine, just can't use the RAM after its setup. Currently using a
> slightly older version of U-boot 1.3.0-dirty.
> 
> -Russ
> 

Hi Russ,

I don't know what the current state is (I'm running a slightly older 
version than you), but we ran into a problem with the 83xx SPD code being 
able to recognize faster DDR2 memories.  There was a whole series of 
nested if/else if statements figuring out if it was DDR400, DDR333, etc., 
and then figuring out effective data rates and CAS latencies from that. 
What we ran into was that (at the time) it would only figure out upto 
DDR400 and we're using 533.  Since we're only using the one speed of RAM 
for this release of the product we just hardcoded values into registers 
and decided to look at fixing SPD later.  Don't know if anyone else has 
yet.  Know it doesn't help you much, but it gives you some place to look 
:(.

Bruce