[U-Boot-Users] Where in u-boot is the RAM "Mode Register" programmed?

[Jerry Van Baren]

Bjook wrote:
>  

[snip]

> The only problem is my hardware layout guy decided to mangle the address 
> lines when he connected the RAM to the ARM processor.  His reasoning was 
> that a RAM address is a RAM address is a RAM address.  If you always 
> access the RAM from the Arm chip then the mangled lines will always get 
> decoded and you will get the correct data value.
> 
> What the layout guy did not realize was that this RAM has a Mode 
> Register that needs to be programmed.  Where does this happen in 
> u-boot?  If I can find out where it is set then I can decode the mangled 
> address lines and put the proper value in.
> 
> Also I will set the “burst read” to 0.
> 
> Do you think this situation salvageable?  A10 is the same because it is 
> a special line but I may need to jumper A8 and A9 since it looks like 
> they are only used to program the address register.

[snip]

> Next time I will fix the mangled lines but I really need to prove out my 
> design on my current 50 boards since another spin takes around a month 
> (because of BGA chips).
> 
> -Bjook

Oooooo, you get this working he owes you a lifetime supply of beer. 
Make him pay for a long time, don't drink it all at once. ;-)

grep is your friend and start.S is the place to start.
/u-boot/cpu/arm920t/at91rm9200/lowlevel_init.S

I'm not familiar with the ARM(r) memory controller.  If it just does 
address and data (looks like it), it should be salvageable (if so, it 
probably isn't worth re-laying out the board unless you have other 
problems).  The initialization is a stream of defines of (address / 
data) pairs at the labels SMRDATA and SMRDATA1.  You will have to warp 
the addresses, but it probably will work.

Good luck,
gvb