| commit | b4d3a83b89fba814613f7ead6b6ea92e0b2c3cd8 | |
| author | Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> | |
| Wed, 4 Oct 2023 08:38:06 +0000 (4 09:38 +0100) | ||
| committer | Laurent Vivier <laurent@vivier.eu> | |
| Fri, 6 Oct 2023 08:33:43 +0000 (6 10:33 +0200) | ||
| tree | 7dd35771fa3a0e8422a7976f5354c5e8d01331ec | treesnapshot (tar.gz zip) |
| parent | 9d35c6ade54c05754a1cac99df5c9a8ce6252bbe | commitdiff |
mac_via: extend timer calibration hack to work with A/UX
The A/UX timer calibration loop runs continuously until 2 consecutive iterations
differ by at least 0x492 timer ticks. Modern hosts execute the timer calibration
loop so fast that this situation never occurs causing a hang on boot.
Use a similar method to Shoebill which is to randomly add 0x500 to the T2
counter value during calibration to enable it to eventually succeed.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-ID: <20231004083806.757242-21-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The A/UX timer calibration loop runs continuously until 2 consecutive iterations
differ by at least 0x492 timer ticks. Modern hosts execute the timer calibration
loop so fast that this situation never occurs causing a hang on boot.
Use a similar method to Shoebill which is to randomly add 0x500 to the T2
counter value during calibration to enable it to eventually succeed.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-ID: <20231004083806.757242-21-mark.cave-ayland@ilande.co.uk>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
| hw/misc/mac_via.c | diffblobblamehistory |