Qemu hangs booting Sysrescuecd for PPC

I am trying to boot the Sysrescuecd ISO image for PPC with Qemu-system-ppc:

/usr/bin/qemu-system-ppc -m 512 -cdrom /home/zoobab/soft/systemrescuecd/sysresccd-ppc-0.2.0.iso -vga std -boot d

It boots with the following OpenFirmware option:

0 > boot cd:,\boot\yaboot

Then it starts Yaboot and the kernel, but it hangs:

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