DOC on Via Epia board

Sometimes, you have to specify the exact IO/MEM address of the DOC, otherwise the util won't find it.

I had that same problem using DOS tools once.

-- Many regards,

Bonny Gijzen TB Systems Holland

Yes, but that is a problem, cos I don't know DoC address. DINFO from M-Systems can't find DoC, my own util can't find DoC (looking on every 16 byte from c0000 to f0000), and on linux (RH 8.0) I tied to build MTD utils and stuff, but can't 'modprobe -a docprobe'. Dmesg says 'No Doc detected' or something. I investigate connections on board and find out that DOC address lines, data lines, CE#, OE# lines are connected to BIOS ROM address lines, data lines, CE#, and OE# line. WE# lines are not connected together, and it's OK. But, if (DOC CE# = = BIOS CE#) can I expect to see BIOS or DoC on whatever address it is (probably 0xe0000)? I tried to boot DOS and then pull out BIOS ROM, but nothing changed. Can't find DoC. I assumed it has something to do with south bridge VT8231. BIOS boot code decompress peaces of BIOS code at various addresses in RAM and then disable access to BIOS ROM. (although, 'option ROM shadowing' is disabled in BIOS). What can I do to get it work? Thanks.

You can't disable shadowing of main system BIOS, because it is compressed in flash. As you say, it is decompressed at boot time into shadow RAM This is how they fit 512K of BIOS into a 256K chip :)

In order to get the DoC to work, you may need to get a custom BIOS from Via. Did you look at the BIOS with MODBIN/MODBIN6 to see if there is a DoC option to be changed there? (not in Epia 2.07, I just looked...)