[U-Boot-Users] 83xx SPD_EEPROM DDR2 Issues

[Bruce_Leonard at selinc.com]

> 
> Today, I went to my local PC store, and bought EVERY type of DDR2 
> SODIMM memory they had, Kingston, Crucial, PC4200, PC5300 four 
> different kinds of memory, and NONE of them will boot with U-boot now.
> 

Hay Russell,

I don't have patches, and I haven't worked on this in a long time because 
we have a single build option for our RAM.  However, I may have a pointer 
for you to look at if you haven't already.  Way back when we we're 
thinking about having SPD support I did spend some time digging through 
spd_sdram.c and found that some of the calculations were....I won't say 
broken, but not exactly acurate because of they way they were done.  I 
also found that the highest data rate speeds supported didn't go high 
enough to support all of the speeds DDR2 can have.  Like I said, it's been 
a long time and someone may have already fixed it, but it had to do with 
calculating max_data_rate, effective_data_rate, and caslat in spd_sdram(). 
 It was something I ment to fix and then never did because we didn't end 
up using it.  Hope this helps.  If not, sorry for the noise.

Bruce