ppc@ i have been interested in running kernel builds on qemu ... but then hit a roadblock.
the OpenBSD macppc installXX.iso images would not boot on the qemu included in ports (qemu-4.0.1). a search revealed the sad state of affairs: https://marc.info/?l=openbsd-tech&m=153450839802519 sharing here some information about 6.6-current. as it is not all bad news :-) 6.6 and 6.6-current can run on qemu. i have been able to make an installation to a RAW disk image on an amd64 host. 1) the commandline $ qemu-system-ppc -M mac99 -cpu g4 -net none -usb \ -device usb-kbd -boot d -cdrom install66.iso qemu documentation mentions https://wiki.qemu.org/Documentation/Platforms/PowerPC -M mac99,via=pmu -M mac99,via=pmu-adb -M mac99,via=cuda (default) i could never get "via=pmu" to work "via=pmu-adb" does not like to work unless "-nographic" is used ... but this mixes the console with the tons of error log from qemu (about the INTR). needs the same coaxing of the kernel to work. in this case we "disable 61" or ohci as there seems to be a conflict. "via=cuda" (== -M mac99, with to extra strings) work with the GUI but requires mapping USB devices. and some extra work via "boot -c" the extra work requires us to disable "adb" ... so boot -c find adb disable 103 quit there are errors showing up for "gem" so "-net none" i'm still reading up on the tun/tap/bridge interface if it is usable. 2) RAMDISK vs GENERIC RAMDISK image can fully boot ... but GENERIC reports a stack smash! quite early during device probing. keyboard not usable in the kernel debugger. the clang kernels i made ... doesn't even show the OpenBSD version string. goes to ddb. keyboard seems to be usable. 3) booting and blessing the firmware used by qemu does not seem to know MSDOS partitions ... so it can not find ofwboot ... even the normal OpenBSD/macppc install (1MB MSDOS part + OpenBSD part) will not boot! the installXX.iso is blessed with an HFS partition courtesy of mkhybrid ... so the ISOs boot up properly. to run my kernel builds ... i had to steal some code from distrib/macppc/iso/Makefile and create my own ISO, and modify bsd.tbxi to allow my bsd.gdb (that is now on the ISO image) to run. if i need a rootdisk i issue a "boot -c -a". may you find these info useful. yorosiku ~
