The checksum used by MacOS to validate the PROM content is an exclusive-OR
rather than a sum over the corresponding bytes. In addition the MAC address
must be stored in bit-reversed format as indicated in comments in Linux's
macsonic.c.
With the PROM contents fixed MacOS starts to probe the device registers
when AppleTalk is enabled in the Control Panel.
Signed-off-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
---
hw/m68k/q800.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/hw/m68k/q800.c b/hw/m68k/q800.c
index 491f283a17..6817c8b5d1 100644
--- a/hw/m68k/q800.c
+++ b/hw/m68k/q800.c
@@ -334,11 +334,8 @@ static void q800_init(MachineState *machine)
prom = memory_region_get_ram_ptr(dp8393x_prom);
checksum = 0;
for (i = 0; i < 6; i++) {
- prom[i] = nd_table[0].macaddr.a[i];
- checksum += prom[i];
- if (checksum > 0xff) {
- checksum = (checksum + 1) & 0xff;
- }
+ prom[i] = bitrev8(nd_table[0].macaddr.a[i]);
+ checksum ^= prom[i];
}
prom[7] = 0xff - checksum;
--
2.20.1
