NMC-5VMX: More than 384MB possible?

Is your memory not fully recognized? (Intel VX chipset Memory recognition)
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mofa84
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I have a NMC 5MVX with the MVP3-Chipset.

According to the manual the maximum amount of RAM ist 384MB, and my 2x256 are also only detected as 2x128.

But afaik the MVP3 supports 768MB. So s it possible to use the whole 256MB of each module?
Denniss
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It seems you need i440BX compatible memory sticks, doublesided with 16 memory chips (8 per seide) and 8x 16 internal organisation.

Maybe a bios update helps to resolve some memory bugs ?
mofa84
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I have flashed the latest 1MBit-BIOS because I don't know if I can flash the 2MBit-Version?!

http://www.enmic.com/default.php?pg=dow ... 8775cc30e0
Denniss
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No - you can't flash the 2MBit version unless you change your 1MBit Flashrom to a 2MBit one.
Is your SDRAM i440BX compatible or are they 8-chip 256MB sticks ?
mofa84
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they both have 8 chips on each side.
Denniss
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Manufacturer, memory chips used ?
It is possible this sticks are internal single sided despite having chips on both sides.

Post an infos from stickers you'll see on your sticks !
mofa84
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the label:
256MB PC133
Mustang
M0032643304N

chips:
Infineon
HYB39S128800CT-7
C2
stephan_g
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These Infineon chips should be the right ones for BX-compatible 256 meggers. Probably it's a BIOS issue. That board should be a relabeled Epox, maybe there's a newer one available there.
mofa84
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well, now it works by using slot 1 and 3, although the bios says that only 256mb can be cached.
Denniss
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Do you have the option to change L2-Cache policy from Write-Back to Write-Through ?

Edit : Sustained 3T-Write to disabled (Chipset Features Setup) should do the trick

L2-Cache will be slower but Cacheable Area should be doubled
apple_rom
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1. Find 2Mbit flashrom and use last 2mbit bios.
2. Get "Mem_Size" procedure from 2Mbit- bios to 1Mbit bios:
- Copy block at 36000-36FFF from 2Mbit to 1B000-1BFFF of 1Mbit.
- change enter point to this - 9860 in the end block change to 98B0.
- recalculate both checksums - "Mem_Size" and "bios_files".
Or simply disable they checking by "nop-ing" at:
1E954 = 90 90 90 90 90 (five nops - compare bios CRC)
1E979 = 90 90 (two nops - compare Mem_Size CRC)
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