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Old 02 December 2019, 12:36   #1
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Can't boot from A4091 with Piccolo SD64 Z3 configured

Hi Toni, here's another odd thing I have noticed...

When I add the Piccolo SD64 Z3 board to a system configuration that already includes the A4091 SCSI controller, there seems to be a conflict between the two boards. I'm not sure if this would also happen with real hardware, or if it is a problem with the emulator.

With the Piccolo SD64 Z3 configured, the A4091 will not boot. It acts as if its boot ROM has been disabled. If I use manual reordering to move the A4091 up the AutoConfig list so it initializes before the SD64, then the A4091 will boot, and the SD64 works fine. With this ordering, the SD64 address range falls entirely after that of the A4091. With default ordering, the SD64 comes first.

Another thing I see is that ShowConfig reports a 16meg RAM allocation for the SD64 with a 12meg subsize, even though the board is only configured with 4meg of VRAM. Configured as a Z2 board, the SD64 correctly shows up with a 4meg allocation.

Could the Piccolo SD64 VRAM be occupying more address space than it's supposed to, thereby intruding on the address space of the A4091?

Configs and HDFs here:


EDIT: Also wanted to note that the A4091 will boot if the SD64 is configured as a Z2 board instead of Z3.

Last edited by superfrog; 02 December 2019 at 13:18.
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Old 02 December 2019, 20:37   #2
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 46
Posts: 25,241
Fix in next beta. Internal Z3 board size was incorrectly set to 64M.

Not sure what subsize means when autoconfig board is not RAM board.
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