John Paul Adrian Glaubitz <glaub...@physik.fu-berlin.de> writes:
> Hi Michael,
>
> On Thu, 2024-02-29 at 17:42 +1100, Michael Ellerman wrote:
>> > There seems to be a regression in the kernel which affects PowerPC 970
>> > machines,
>> > i.e. PowerMac G5 CPUs. The issue needs to be bisected and reported
>> > upstream.
>>
>> I have a quad G5 that is booting mainline happily.
>
> it's a really tricky problem because it seems to depend on how the kernel
> image
> is booted.
>
> It fails when trying to boot the kernel off the installation CD, i.e. like
> from here:
>
>> https://cdimage.debian.org/cdimage/ports/snapshots/2024-02-25/debian-12.0.0-ppc64-NETINST-1.iso
>
> but the kernel will boot fine when installing in an existing system which was
> installed
> with an installation CD which uses an older kernel.
>
>> https://cdimage.debian.org/cdimage/ports/snapshots/2023-06-18/debian-12.0.0-ppc64-NETINST-1.iso
>
> I have not really figured out yet what the problem is.
OK.
That second iso boots OK for me in qemu. It boots grub and then the
kernel loads and shows:
Loading ...
OF stdout device is: /pci@f0000000/mac-io@c/escc@13000/ch-a@13020
Preparing to boot Linux version 6.3.0-1-powerpc64
(debian-ker...@lists.debian.org) (gcc-12 (Debian 12.3.0-2) 12.3.0, GNU ld (GNU
Binutils for Debian) 2.40) #1 SMP Debian 6.3.7-1 (2023-06-12)
Detected machine type: 0000000000000400
command line: BOOT_IMAGE=/install/vmlinux --- quiet
memory layout at init:
memory_limit : 0000000000000000 (16 MB aligned)
alloc_bottom : 0000000005e70000
alloc_top : 0000000030000000
alloc_top_hi : 0000000080000000
rmo_top : 0000000030000000
ram_top : 0000000080000000
copying OF device tree...
Building dt strings...
Building dt structure...
Device tree strings 0x0000000005e80000 -> 0x0000000005e80560
Device tree struct 0x0000000005e90000 -> 0x0000000005ea0000
Quiescing Open Firmware ...
Booting Linux via __start() @ 0x0000000002000000 ...
Hello World !
smp_core99_probe
smp_core99_bringup_done
Starting system log daemon: syslogd, klogd.
And eventually starts the installer.
That's using no VGA, so possibly there's something wrong with the video
setup on real hardware:
$ qemu-system-ppc64 -nographic -vga none -M mac99,via=pmu -smp 1 -m 2G -nic
user -drive
file=$HOME/debian-12.0.0-ppc64-NETINST-1.2023-06-18.iso,format=raw,media=cdrom
-boot d
I'll try and find time to test it on my actual G5 next week when I'm in
the office.
cheers
