assert in stm32l4x5_rcc

• Operating system: Ubuntu 22.04.4 LTS

• OS/kernel version: Linux 6.5.0-25-generic

• Architecture: aarch64

• QEMU flavor: 9.0.0

• QEMU version: commit 7e1c0047

• QEMU command line:

  cat << EOF | qemu-system-aarch64 -display \
  none -machine accel=qtest, -m 512M -machine b-l475e-iot01a -qtest stdio
  writeq 0x40021008 0xffffffff
  EOF

Description of problem

The following log reveals it:

qemu-system-aarch64: ../hw/misc/stm32l4x5_rcc.c:546: void rcc_update_cfgr_register(Stm32l4x5RccState *): Assertion `val <= 0b100' failed.
Aborted

Steps to reproduce

cat << EOF | qemu-system-aarch64 -display \
none -machine accel=qtest, -m 512M -machine b-l475e-iot01a -qtest stdio
writeq 0x40021008 0xffffffff
EOF