They will work, but they are slower than standard RAM, as they have higher latencies for for reliability, on top of the fact that PC3200 RAM would run at further lower latencies at 266MHz.

The ECC feature is not used as the processor exceptions are not hooked up (the same as 36-bit addressing is not hooked up).

However the Marvell Northbridge can count ECC exceptions and you can gain statistics on it. You are free to reverse engineer how to do this on pain of voiding your warranty when you fry your board.

If you manage to install more than 2GB of RAM and coerce the firmware to configure it, too, then you can encourage the Marvell Northbridge to map it in the 36-bit address space and access it using the DMA controller. Again, on pain of voiding warranty :)

Both are documented somewhere in code online (the DMA controller has an old Linux driver by a Philip Something?) if you search hard enough.

_________________
Matt Sealey

btw, you are lucky, i've just now bought a 1GB stick and doesn't work on peg2....

_________________
acrux _at_ linuxmail _dot_ org

I bought an 512MB RAM module a few weeks ago, and it did not work. It's a 400Mhz one. Today I put it in an old P4 and took a 333Mhz 512 MB module home, put it into my Pegasos, and it works fine. So I have now a total of 768MB of RAM in my Peg.

Maybe you will have more luck with an older module? Just a guess...

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CzP
http://czanik.blogs.balabit.com/

mmh, i've just bought a 512MB pc2700 (samsung) for our peg2, it works. I cannot add the other 256MB 'cause slot2 seems to be broken :/

_________________
acrux _at_ linuxmail _dot_ org

Finally I downgraded to 512MB, as using both of the modules worked for most of the time, even for compiles, but crashed the openSUSE installer all the time. And I don't want to take it out for all the installs and put it back for the rest, as sometimes I do installs more than once a day :-)

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CzP
http://czanik.blogs.balabit.com/

We shipped many ODW with 1GB in each slot. 2GB works and is still working today in many instances.

R&B :)

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http://bbrv.blogspot.com

Caveat: you may need paired RAM and you may need a 2B5 revision board for it to work. We used Kingston kit ram with blue heatspreaders.. I think KHX3200AK2/2G is the right model.

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Matt Sealey

i've tried a bit again.

Pegasos2 does accept both low or high density mem modules but never exceeding 512MB per rank...

then a maximum of 512MB module x slot if high density type or 1024MB module x slot if low density one.

_________________
acrux _at_ linuxmail _dot_ org

but our pegasos2 (fw version 1.2 20040810112413) seems to have some problems and great instability using more than 512MB then we'll move this machine only to test peg2 iso boot kernel.

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acrux _at_ linuxmail _dot_ org

FWIW, I'm using exactly one of these (sorry, it's a greek site):

http://www.e-shop.gr/show_per.phtml?id=PER.552054

For quite some time with absolutely no problems. Using both for a total of 2GB didn't work, but one of these is fine. I still have the 2nd here as a spare but no machine to use it :)

thanks for the hint, maybe i'll try again in the future (maybe not). I'm a deadly tired to lose time in this way.

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acrux _at_ linuxmail _dot_ org

we really need to upgrade our Pegasos2 (fw version 1.2 20040810112413) to 2GB ram. Can somebody tell/suggest me about 100% working ones? Brand/Type .

btw, did someone use PCI66 slot ?

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acrux _at_ linuxmail _dot_ org

Any single 2GB unbuffered non-ECC module should work fine, but in reality.. they are really hard to find. If you had a 2B5 board (firmware 2005xxxx) then two 1GBs would have been fine. Older boards have some real trouble in this department.
None of the Pegasos PCI slots are 66MHz capable except the AGP slot. This is because for PCI slots to be 66MHz capable, every device on the bus needs to support it too, and the VT8231 is on that very same bus.. and it's a 33MHz device.

So unfortunately they will all run 33MHz.

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Matt Sealey

Rev. 2B3 and i'm actually unable to have more then 512MB. With two 512MBs it's totally unstable... then it's an own board revision limit. That's bad.
oh, that's bad again.
Anyway, thanks for your detailed answer. It really helps.

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acrux _at_ linuxmail _dot_ org

You may be able to find something that works, but, basically 2B5 is the only one that doesn't have any problem.

My Pegasos is a 2B3 and it has 1GB of RAM in it. It may go up to 2GB.. but most people see weird segfaults in Linux, although memory testing apps seem to work just fine, at random.

You could try it. Crucial will sell a 2x1GB pack and they have a no-quibble returns policy and free shipping. We're even in the Manufacturer list (http://www.crucial.com/eu/)

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Matt Sealey