Starting Qemu with "qemu-system-unicore32 -M puv3,accel=qtest -S -nographic"
and entering "x 0 " at the monitor prompt leads to abort():
$ ./unicore32-softmmu/qemu-system-unicore32 -M puv3,accel=qtest -S -nographic
QEMU 2.9.90 monitor - type 'help' for more information
(qemu) x 0
qemu: fatal: uc32_cpu_get_phys_page_debug not supported yet