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Re: CB030, A 68030 SBC for hobbyists [message #6945 is a reply to message #6944] Tue, 21 January 2020 07:23 Go to previous messageGo to previous message
etchedpixels is currently offline  etchedpixels
Messages: 333
Registered: October 2015
Senior Member
If it traps on move.w ccr then the CPU is seeing move.w sr still so I think you are right - CP/M is self modifying the instruction and restarting it. For 68030 you also need to ensure the data cache is written back before the instruction cache is flushed or your modification might not be seen by the i cache. Unlike x86 there is not a lot of coherency done in hardware on a 68K.

@jcoffman: I guess you've got no 32bit aligned/32bit wide I/O or you don't turn on WA ? It's very dependent upon what you are doing - when the Commodore Amiga went 68030 it caused a good deal of chaos.

Alan
 
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