The sun4u machines use a slightly different modification of the ISA Mostek chip. It has MMIO, 1968 as a base year and no IRQ line. Since it matches our m48t08, make keep PIO behavior for the 59 model and use MMIO for the 8 model.
This series fixes recognising Mostek RTC in the Linux/sparc64 guest. Artyom Tarasenko (2): m48t59: use mmio for the m48t08 model of the m48t59_isa card sparc64: Use the correct type of the Mostek NVRAM chip hw/sparc64/sun4u.c | 5 ++++- hw/timer/m48t59.c | 38 +++++++++++++++++++++++++++++++++++--- 2 files changed, 39 insertions(+), 4 deletions(-)