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Re: CB030, A 68030 SBC for hobbyists [message #7548 is a reply to message #7493] Fri, 17 April 2020 21:47 Go to previous messageGo to previous message
mikemac is currently offline  mikemac
Messages: 250
Registered: March 2017
Senior Member
plasmo wrote on Sat, 11 April 2020 06:55
Added instructions on how to modify CF interface to 16-bit. Also added the corresponding CPLD equations. Still need to upload the CP/M68K BIOS, modified memory map, and modified schematic.
https://www.retrobrewcomputers.org/doku.php?id=builderpages: plasmo:cb030:cb030_rev1:16-bit_cf_upgrade
Bill

Argh! Spent the day pulling my hair out as none of the results I was getting from the new 16 bit CF interface made sense to me. In 8 bit PIO mode, it should "just work" but it was failing with the data never ready after the read command was sent. I finally switched out my Transcend 4G card for my 64M. Same problem. Swapped it out for the 256M card that has CPM on it. Works like a charm! Swapped that out for another SanDisk 8M card and it works too.

Enable the 16 bit mode and both SanDisk cards work. The 4G and 64M ones still fail. Both of those should have worked at least in 8 bit mode. I'm at a loss as to why they don't. Unless the fact that the IRQ line is now connected to something [GND via a 10K resistor] causes the card to intialize into a different mode.

That's all in the boot loader, BTW.

Using the 8M card, it does boot into Linux. Quickly too! Linux currently craps out once the CF device driver gets initialized because of the new IRQ that the old driver isn't expecting. That should be pretty easy to fix. [Knock on wood!]

I'm not sure I'm going to be able to produce a single set of binaries that'll work on CB030s with and without the 16bit CF mod. At least not without some major work to the CF driver in the boot loader.



Mike
 
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