Qemu won't boot i386 kernel or amd64 kernel directly

Reinoud Zandijk <[email protected]> Fri, 13 Nov 2020 21:08:59 +0100

Newsgroups	gmane.os.netbsd.ports.x86-64,gmane.os.netbsd.ports.i386
Message-ID	<[email protected]>

Dear folks,

I'm trying to run a NetBSD-current kernel using qemu using the 'qemu -kernel'
option. The host is an 86_64 machine.

When trying out an NetBSD-current/x86_64 kernel (amd64) qemu won't load the
kernel and complains about

qemu-system-x86_64: Error loading uncompressed kernel without PVH ELF Note

I'm curious as how if possible these notes can be added and what they ought to
be! The only reference i found so far are Xen 4.x PVH ELF notes. Is it
possible? Would reverse-engineering Qemu on this help?

When trying out an NetBSD-current/i386 kernel, qemu acceps the kernel since
the i386 kernel supports multiboot. The kernel starts fine but the CPU
detection fails and it panics.

I've tried running 

qemu-system-x86_64 -m 2048 -cdrom boot-com.iso -drive file=dummy.fs,format=raw
-net nic -net tap,ifname=tap0,script=no -kernel
/usr/sources/cvs.netbsd.org/src-clean/obj/sys/arch/i386/compile/GENERIC/netbsd
-serial stdio -cpu pentium -display curses

but also

qemu-system-i386 -m 2048 -cdrom boot-com.iso -drive file=dummy.fs,format=raw
-net nic -net tap,ifname=tap0,script=no -kernel
/usr/sources/cvs.netbsd.org/src-clean/obj/sys/arch/i386/compile/GENERIC/netbsd
-serial stdio -cpu pentium -display curses

It doesn't matter what CPU I specify in either -86_64 or -i386 or if I obmit
it even; its completely ignored and the output is always:

[   1.0000030] ACPI: 1 ACPI AML tables successfully acquired and loaded
[   1.0000030] ioapic0 at mainbus0 apid 0
[   1.0000030] cpu0 at mainbus0 apid 0
[   1.0000030] cpu0: Intel 386-class
[   1.0000030] cpu0: node 0, package 0, core 0, smt 0
[   1.0000030] panic: NetBSD requires an 80486DX or later processor

[   1.0000030] The operating system has halted.
[   1.0000030] Please press any key to reboot.

Any thoughts or hints on this?

Thanks in advance,
Reinoud

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