OpenSBI 1.5 packaged in QEMU 9.0.50 fails to support poweroff with 'spike' board

Host environment

• Operating system: Ubuntu 24.10
• OS/kernel version: 6.8.0-31-generic
• Architecture: amd64
• QEMU flavor: qemu-system-riscv64
• QEMU version: 9.0.50 (v9.0.0-2711-g93b799fafd)
• QEMU command line: qemu-system-riscv64 -kernel u-boot.bin

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.