mac_via: update comment for VIA1B_vMystery bit
According to both Linux and NetBSD, port B bit 6 is used on the Quadra 800 to configure the GLUE logic in A/UX mode. Whilst the name VIA1B_vMystery isn't particularly descriptive, the patch leaves this to ensure that the constants in mac_via.c remain in sync with Linux's mac_via.h. Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-Id: <20211020134131.4392-2-mark.cave-ayland@ilande.co.uk> Signed-off-by: Laurent Vivier <laurent@vivier.eu>
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@ -130,6 +130,10 @@
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* On SE/30, vertical sync interrupt enable.
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* 0=enabled. This vSync interrupt shows up
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* as a slot $E interrupt.
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* On Quadra 800 this bit toggles A/UX mode which
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* configures the glue logic to deliver some IRQs
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* at different levels compared to a classic
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* Mac.
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*/
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#define VIA1B_vADBS2 0x20 /* ADB state input bit 1 (unused on IIfx) */
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#define VIA1B_vADBS1 0x10 /* ADB state input bit 0 (unused on IIfx) */
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