Old versions of SunOS don't understand the "Sun4m with OBP" machine type of 0x80. They expect the machine type of actual Sun machines, e.g., 0x71 or 0x72. This patch adds a machine type to the Sparc target and renames the old machine to clarify that it's emulating an OBP platform rather than standard hardware.
The default behavior (without a -M flag) will be the same (using machine type of 0x80/OBP), but the explicit name for the OBP platform is now "sun4m-obp". Plain old "sun4m" mimics real hardware. This patch doesn't make SunOS 4.x boot completely under qemu, as both machines still use OpenBIOS as their boot rom, and there are a bunch of OpenBIOS incompatibilies with SunOS. I've submitted a patch to fix a number of them to the OpenBIOS mailing list, but there are still some glitches keeping the machine from booting. But this patch is necessary to boot SunOS 4.x.
qemu-sunos.patch.gz
Description: GNU Zip compressed data
