Emulating sd card with hifive_u risc-v machine

[Pascal Scholz]

Hi all,

I'm hoping that I addressed the right mailing lists.

I'm working a bit with qemu's risc-v emulation. My current goal is to 
simulate a complete boot process for the SiFive Unleashed Board (SU 540 
SoC)[1]. I've created the correspondig OpenSBI and U-Boot images, being 
the -bios and the -kernel images. It's possible for me to boot up to the 
U-Boot prompt. From this prompt I now want to boot an system image 
located on an emulated sd card.

However I now fail to get a working sd card within qemu for the device 
sifive_u. For example i tried the following command:

qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios 
build/platform/sifive/fu540/firmware/fw_jump.bin -kernel 
../../u-boot/u-boot.bin -device sdhci-pci -device sd-card,drive=sdX 
-drive id=sdX,if=none,format=raw,file=path/to/image.elf

This results in Qemu telling me: -device sdhci-pci: No 'PCI' bus found 
for device 'sdhci-pci'.

Using the machine "virt" the command above works.

The thing i tried was:

qemu-system-riscv64 -M sifive_u -m 8G -serial stdio -bios 
opensbi/build/platform/sifive/fu540/firmware/fw_jump.bin -kernel 
../u-boot/u-boot.bin -sd path/to/image.elf

Resulting in: machine type does not support if=sd,bus=0,unit=0


Even if the machine gets stuck at some point when booting, Qemu has no 
problem starting the VM if I use "-M virt" instead of "-M sifive_u". At 
this point i think, that the machine "sifive_u" doesn't support sd 
cards? Is this guess right or is there anything left I can try? After 
all I'm a bit confused, because there seems to be a block device "sd0" 
when I try to start the machine "sifive_u" without any additional 
device/drive arguments. I would really appreciate if someone would tell 
me, what I'm doing wrong.

Thanks in advance and stay healthy!

Best regards

Pascal


[1] https://www.sifive.com/boards/hifive-unleashed