OpenSBI 1.5 packaged in QEMU 9.0.50 fails to support poweroff with 'spike' board
Steps to reproduce:
Build upstream U-Boot:

- git clone https://source.denx.de/u-boot/u-boot.git
- cd u-boot
- make qemu-riscv64_smode_defconfig
- CROSS_COMPILE=riscv64-linux-gnu- make

Run U-Boot and execute poweroff command

- qemu-system-riscv64 -kernel u-boot.bin
- poweroff

Poweroff fails.

When building upstream OpenSBI v1.5 with 

- git clone https://github.com/riscv-software-src/opensbi.git
- cd opensbi
- git reset --hard v1.5
- CROSS_COMPILE=riscv64-linux-gnu- make PLATFORM=generic

and then running

- qemu-system-riscv64 -bios fw_dynamic.bin -kernel u-boot.bin
- poweroff

poweroff succeeds.

Please, distribute an unpatched OpenSBI v1.5 with QEMU.