[LinuxBIOS] problem about dram init

[aaron lwe]

On Dec 27, 2007 1:22 PM, ron minnich  wrote:
> yes I think you are probably right but how are the fixed mtrr's set?
>
> I don't know, This still seems like memory timing issues to me but who
> knows.
>
> ron

ron, you're right, it's a dram configuration problem.
after I set the dram clocking control and signal timing
control registers, it worked well after enabling memory
cache. Hmm...these registers have nothing to do when
cache disabled? and they are not mentioned in the
bios porting guide either

[ron minnich]

On Dec 27, 2007 10:44 PM, aaron lwe  wrote:
> ron, you're right, it's a dram configuration problem.
> after I set the dram clocking control and signal timing
> control registers, it worked well after enabling memory
> cache. Hmm...these registers have nothing to do when
> cache disabled? and they are not mentioned in the
> bios porting guide either

This is a tricky issue that can come up when caching is turned on,
since caching does bursts, and that's another point at which any small
timing errors will be experienced.

That's what happened to you ... I am very glad you fixed it.

thanks

ron