Re: eb164 SROM

Rolf Karlstad (
Fri, 8 Nov 1996 19:11:39 -0600 (CST)

> Nope, don't think so. Ponder this:
> Machine I am sitting next to:
> 300MHz EB164
> 256 MB RAM
> 2 MB cache
> ncr 53c810 scsi
> 1 x quantum XP 34300 fast scsi 3 (wide)
> trio64+ s3 video
> 512MB swap on sda1 1, root on sda2
> Things to check:
> SROM's on some machines don't recognise RAM properly. Does SRM or MILO see
> right amount of RAM?
> Bad cache can show up in mysterious ways, as well. Only way to check this is
> to change it (not so easy, as it is a very special part).
> I do know that after fighting with an EB164 very much like yours, it is now
> running kernel 2.0.24, and is quite happy so far.
> I am fighting with a Buslogic on it, and after that it is pretty well where
> I want it to be.
> >first, (this is during 3.0.3 and 4.0 installs) mkswap fails.
> Yup, this happened to me too, until new SROM was installed. System at that
> time only saw 64MB< not the 256 that is in it.

Okay, Okay... :P I think that I am seeing the light. After paying attention
to what you were saying, I looked through my (sparse) manual, and located the
SROM. In the diagrams, it is number 16, component number U12, described as:
"Xilinx serial ROM (initialization code) chip (mbB164.30)"
and it is located right next to the bottom SIMM socket. It IS socketed, and
has a yellow paper label that reads "U12 DAF2"
I suppose that this is the little creature that needs to be replaced. :)
I was fooled, because the SRM console ALWAYS saw 128 MB. MILO, however,
had to be told that I had 128 MB, or would default to 32 MB.

> >> Do the milo and kernel versions have to match?
> No, I have booted this machine with it's older 2.0.12 and worked OK as well.

I find this interesting:
With the 2.0.12 MILO and the 2.0.18 kernel, fsck would always validate my
/usr partition, whereas with the 2.0.22 MILO and the 2.0.18 kernel, it would
always FAIL. Ack. Happily, it took that catalyst to get me to see the
light. If I had been following the (ahem.. unspoken) rules (bug!) and
had / and /usr on one partition, I'd have never had that kick in the pants
to get a solution.

thanks much for your insight.

Rolf Karlstad
Univertsity of Minnesota

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