SDRAM board

[Sorgelig]

It's auto-detected but detection happens in Menu core.
So make sure you start Menu core first.

[richx]

Hi all,

would you say that I am correct to assume that adding an SDRAM board does not require any configuration?
Just for transparency, I've got a 128Mb v2.5 that core does not see. Basically, memtest shows 100% failure (multiple versions, all speeds), as if I didn't plug the board in.

Cheers

Also, I initially had the same issue with my bad PCB board, see a few posts back, menu RAM icon and memtest were acting like SDRAM module was not plugged in. If you built this yourself, you can check continuity between module header and RAM chip and also between the RAM chips to see if the nodes are connected properly.

[Rikko]

@Sorgelig:
perhaps I'm not doing it right, but it's the Menu that I use to start the memtest.

@richx:
I was afraid of this, and I didn't come up with anything else, before I reached out.

Thank you both for sharing your wisdom with me. I'll post here once I figure it out, for record purposes.

Cheers

EDIT:
Sorted. It was a "cold solder" on pin 34 of the U1.
Memtest v191220 - 140MHz
Memtest v190920 - 150MHz

Thanks again

[reflex]

Hi all,

would you say that I am correct to assume that adding an SDRAM board does not require any configuration?
Just for transparency, I've got a 128Mb v2.5 that core does not see. Basically, memtest shows 100% failure (multiple versions, all speeds), as if I didn't plug the board in.

Cheers

No configuration needed. Are you certain you didn't plug it in backwards or something?

[Rikko]

No configuration needed. Are you certain you didn't plug it in backwards or something?

You know, someone may laugh at this, but I realised it's a challenge to figure out which way things go. Luckily for me, "this side faces outward" was indicative enough to avoid mistakes. I agree it would have been easier if the whole thing is keyed somehow, but with generic 2x40 header, it's not practically feasible to do (excluding replacement of the header itself).

In my case, it turned out to be a poor connection on pin 34 on one of the memory chips.

Cheers

[reflex]

No configuration needed. Are you certain you didn't plug it in backwards or something?

You know, someone may laugh at this, but I realised it's a challenge to figure out which way things go. Luckily for me, "this side faces outward" was indicative enough to avoid mistakes. I agree it would have been easier if the whole thing is keyed somehow, but with generic 2x40 header, it's not practically feasible to do (excluding replacement of the header itself).

In my case, it turned out to be a poor connection on pin 34 on one of the memory chips.

Cheers

Back in the mid-90's I owned a PC repair/build shop. While working very late at night I wasn't paying attention and inserted a 486 CPU (actually an AMD5x86 133Mhz) into the socket backwards (they weren't keyed back then). When I powered it on there was a pop and a flash and I couldn't get it to boot up. When I realized what I had done I assumed I had killed the CPU for good. With nothing to lose I started tinkering. By default this was a 3.45v CPU, but I discovered that if I set the board voltage to 5v, it booted!

I still have that CPU, and it still boots, but only at 5v.