On 22/07/2026 02:15, Nathan Chancellor wrote:
Hi Mark,
On Tue, Jul 07, 2026 at 10:32:05PM +0100, Mark Cave-Ayland wrote:
The following changes since commit 916ab315cc2b3a3825ebb399d83339660144d5bd:
Merge tag 'pull-nvme-20260707' of https://gitlab.com/birkelund/qemu into
staging (2026-07-07 07:09:38 +0200)
are available in the Git repository at:
https://github.com/mcayland/qemu.git tags/qemu-openbios-20260707
for you to fetch changes up to 9e3508dce0045de26ec8cab064443c92fdd15288:
Update OpenBIOS images to e5ac46dd built from submodule. (2026-07-07
22:07:16 +0100)
----------------------------------------------------------------
qemu-openbios queue
----------------------------------------------------------------
Mark Cave-Ayland (1):
Update OpenBIOS images to e5ac46dd built from submodule.
pc-bios/openbios-ppc | Bin 677200 -> 673104 bytes
pc-bios/openbios-sparc32 | Bin 382080 -> 382048 bytes
pc-bios/openbios-sparc64 | Bin 1593408 -> 1593408 bytes
roms/openbios | 2 +-
4 files changed, 1 insertion(+), 1 deletion(-)
I bisected a hang that I see when trying to boot a Linux kernel built
from pmac32_defconfig to this change.
$ git show 9e3508dce0045de26ec8cab064443c92fdd15288:pc-bios/openbios-ppc
>openbios-ppc-bad
$ git show 9e3508dce0045de26ec8cab064443c92fdd15288^:pc-bios/openbios-ppc
>openbios-ppc-good
$ curl -LSs
https://github.com/nathanchance/bug-files/raw/main/qemu-9e3508dce0045de26ec8cab064443c92fdd15288/rootfs.cpio.zst
| zstd -d >rootfs.cpio
$ curl -LSs
https://github.com/nathanchance/bug-files/raw/main/qemu-9e3508dce0045de26ec8cab064443c92fdd15288/vmlinux.zst
| zstd -d >vmlinux
$ qemu-system-ppc \
-display none \
-nodefaults \
-no-reboot \
-machine mac99 \
-append console=ttyS0 \
-kernel ./vmlinux \
-initrd ./rootfs.cpio \
-m 128m \
-serial mon:stdio \
-bios ./openbios-ppc-good
>> =============================================================
>> OpenBIOS 1.1 [Sep 24 2024 19:56]
>> Configuration device id QEMU version 1 machine id 1
>> CPUs: 1
>> Memory: 128M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,G4
milliseconds isn't unique.
Output device screen not found.
Output device screen not found.
>> [ppc] Kernel already loaded (0x01000000 + 0x00ed2410) (initrd 0x01fd3000
+ 0x004fb000)
>> [ppc] Kernel command line: console=ttyS0
>> switching to new context:
NULL ihandle
Unexpected client interface exception: -2
printk: legacy console [ttyS0] enabled
printk: legacy bootconsole [udbg0] disabled
pid_max: default: 32768 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
VFS: Finished mounting rootfs on nullfs
Memory: 108176K/131072K available (10508K kernel code, 1004K rwdata, 2180K
rodata, 1232K init, 178K bss, 21680K reserved, 0K cma-reserved, 0K highmem)
Found UniNorth PCI host bridge at 0x00000000f2000000. Firmware bus number:
0->0
...
Starting network: OK
Linux version 7.2.0-rc4+ (nathan@ax162) (powerpc-linux-gcc (GCC) 16.1.0, GNU
ld (GNU Binutils) 2.46) #1 PREEMPT Tue Jul 21 16:59:50 MST 2026
Stopping network:OK
Stopping klogd: OK
Stopping syslogd: OK
Seeding 256 bits without crediting
seedrng: can't open '/dev/urandom': No such file or directory
The system is going down NOW!
Sent SIGTERM to all processes
Sent SIGKILL to all processes
Requesting system reboot
reboot: Restarting system
$ qemu-system-ppc \
-display none \
-nodefaults \
-no-reboot \
-machine mac99 \
-append console=ttyS0 \
-kernel ./vmlinux \
-initrd ./rootfs.cpio \
-m 128m \
-serial mon:stdio \
-bios ./openbios-ppc-bad
>> =============================================================
>> OpenBIOS 1.1 [Jun 29 2026 21:11]
>> Configuration device id QEMU version 1 machine id 1
>> CPUs: 1
>> Memory: 128M
>> UUID: 00000000-0000-0000-0000-000000000000
>> CPU type PowerPC,G4
milliseconds isn't unique.
Output device screen not found.
Output device screen not found.
>> [ppc] Kernel already loaded (0x01000000 + 0x00ed2410) (initrd 0x01fd3000
+ 0x004fb000)
>> [ppc] Kernel command line: console=ttyS0
>> switching to new context:
<hangs with no additional output>
Presumably this is due to OpenBIOS commit b0267d5 ("ppc: bump SAVE_SPACE
to include enough space to store all registers"), as this appears to be
the only actual source change to OpenBIOS? I have not had time to try
running under gdb to get more information about where it is hanging but
I wanted to get this report out sooner rather than later.
Hi Nathan,
Thanks for the heads-up: nothing showed up in my local tests before committing, so I
will take a look over the next few days.
ATB,
Mark.
