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| author | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2022-03-05 15:09:55 +0000 |
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| committer | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | 2022-03-09 09:28:28 +0000 |
| commit | 677a4725b1c49b139b00d8eaa932676ed8620931 (patch) | |
| tree | 28bc9adb208ff5b684d0e16260f8950324b92fd4 /python/qemu/utils/accel.py | |
| parent | d4454e41d74b85c92fbca06a30622a18545aad81 (diff) | |
| download | focaccia-qemu-677a4725b1c49b139b00d8eaa932676ed8620931.tar.gz focaccia-qemu-677a4725b1c49b139b00d8eaa932676ed8620931.zip | |
mac_via: make SCSI_DATA (DRQ) bit live rather than latched
The VIA2 on the Q800 machine is not a separate chip as in older Macs but instead is integrated into the on-board logic. From analysing the SCSI routines in the MacOS toolbox ROM (and to a lesser extent NetBSD and Linux) the expectation seems to be that the SCSI_DATA (DRQ) bit is live on the Q800 and not latched. Fortunately we can use the recently introduced mos6522 last_irq_levels variable which tracks the edge-triggered state to return the SCSI_DATA (DRQ) bit live to the guest OS. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org> Message-Id: <20220305150957.5053-11-mark.cave-ayland@ilande.co.uk> Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Diffstat (limited to 'python/qemu/utils/accel.py')
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