low level shell
ollie at lanl.gov
Thu Oct 28 11:09:00 CEST 2004
On Thu, 2004-10-28 at 08:22, Eric W. Biederman wrote:
> "Ronald G. Minnich" <rminnich at lanl.gov> writes:
> > On Wed, 27 Oct 2004, Eric W. Biederman wrote:
> > > The other trick that helps is to hard code the memory configuration and
> > > put that in the fallback image. And then use a second copy of linuxbios
> > > to develop new code. At least that way you don't need to swap the rom
> > > chip.
> > some times that works, sometimes not. On the i855gm, hardcoding did not
> > seem to work -- there's something dynamic you have to do, evidently, and
> > just setting in the registers was not it.
> I guess what I meant was that you can hard code the values that
> only change when you swap dimms. This means you don't initially need
> to look at SPD and all of that jazz when you first start bringing
> your memory up.
I guess this is the most diffcult part. Once you know how to issue the
JEDEC command to the DRAM chip via the memory controller, you have no
problem to program the size info in the controller.
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