On Sat, Jul 12, 2008 at 9:05 PM, ron minnich <rminnich(a)gmail.com> wrote:
On Sat, Jul 12, 2008 at 3:36 PM, Tom Sylla
The decode might seem interesting, but this is
close to veering down a
You do *not* want to try and futz around with any of those settings. The
values in the table (plus the missing one for unterminated) are the only
ones you will ever want to use. Thousands of hours of debug and
validation time by AMD came up with those numbers. You should not have
to "tweak" any of those settings to get something to work. There are
comments in the coreboot source to that effect, too.
believe me, I dont' want to mess with them.
My only reason to point this out is that by decoding it, you are sort of
implying that the fields might need to be tweaked.
no. Here's my thinking. It could decode those bits and then say,
"This is appropriate to an UNTERMINATED bus with ONE row of DIMMS and
4 devices. "
"The DRAM hardware is configured for CL 2.5'
and so on.
I.e. allow people to backtrack from the settings to the hardware and
see if things make sense. The goals is NOT to tweak the individual
in fact I'm actually working with a mobo vendor RIGHT NOW to create
this type of 'what are the settings' tool for barcelona so we can
track down a bug. Would that we had it.
Although, really, would that they had listened and done coreboot in
the first place; they're having trouble on a DRAM config problem and
lack of coreboot means it is hard to help them .
In fact, make that *2* vendors I am talking to in this situation; same
problem, different (very different) boards.