Re: memory management things to hack...

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 17 Nov 1997 23:09:12 +0000 (GMT)

> fine with 256M of ram. However, it crashes almost immediately (during
> boot) when the machine has 512M of ram installed. It doesn't even work
> if I use "mem=256M" ( i don't know why). Now, I have managed to get the
> machine usable with 512M by using kernel 2.1.62.

The way memory is mapped by hardware normally interleaves the SIMMs so a
bad spot on a SIMM will cause crashes in any setup on a good box.

> Questions: why does 2.1.62 work? (Machine has been runing 4 days now -
> but not without some odd quirks, not sure if its because its 2.1.X or if
> not all is well with 512M still, or both)

Now that is a different puzzle. Given the other randomness I'd suspect the
SIMM or boards. You could perhaps try 256Mb using the other SIMMs if thats
a legal setup on your box (ie pull the known to work ones)