Public bug reported:
With the RTC configure for Binary instead of BCD I am getting the
incorrect result for Century.
mov al, 0x0B ; Set RTC to binary mode
out 0x70, al
in al, 0x71
bts ax, 2
mov bl, al
mov al, 0x0B
out 0x70, al
mov al, bl
out 0x71, al
mov al, 0x32 ; Century
out 0x70, al
in al, 0x71
In QEMU 0.12.5 it returns 0x20 but should return 0x14. The following
work correctly:
mov al, 0x09 ; Year
out 0x70, al
in al, 0x71
mov al, 0x08 ; Month
out 0x70, al
in al, 0x71
mov al, 0x07 ; Day
out 0x70, al
in al, 0x71
** Affects: qemu
Importance: Undecided
Status: New
--
Accessing Century byte via RTC
https://bugs.launchpad.net/bugs/659276
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Status in QEMU: New
Bug description:
With the RTC configure for Binary instead of BCD I am getting the incorrect
result for Century.
mov al, 0x0B ; Set RTC to binary mode
out 0x70, al
in al, 0x71
bts ax, 2
mov bl, al
mov al, 0x0B
out 0x70, al
mov al, bl
out 0x71, al
mov al, 0x32 ; Century
out 0x70, al
in al, 0x71
In QEMU 0.12.5 it returns 0x20 but should return 0x14. The following work
correctly:
mov al, 0x09 ; Year
out 0x70, al
in al, 0x71
mov al, 0x08 ; Month
out 0x70, al
in al, 0x71
mov al, 0x07 ; Day
out 0x70, al
in al, 0x71
