Emulate Rpi with QEMU fails

[Thomas]

Hi,

I'm trying to emulate Rpi with QEMU.
I found
[url=https://www.raspberry-pi-geek.de/ausgaben/rpg/2014/04/raspberry-pi-emulieren/]this[/url]
arcticle in Raspberry Pi Geek documenting the steps including persistent
storage on host.

However when starting the emulation with command
qemu-system-arm -M versatilepb -cpu arm1176 -m 256 -serial stdio -hda
2020-08-20-raspios-buster-armhf-lite.img -net
"user,hostfwd=tcp::5022-:22" -dtb versatile-pb-buster.dtb -kernel
kernel-qemu-5.4.51-buster -append "root=/dev/sda2 rootfstype=ext4 rw
panic=1" -no-reboot
I get this error:
VFS: Cannot open root device "sda2" or unknown-block(0,0): error -6
Please append a correct "root=" boot option; here are the available
partitions:
0100            4096 ram0
 (driver?)
0101            4096 ram1
 (driver?)
0102            4096 ram2
 (driver?)
0103            4096 ram3
 (driver?)
0104            4096 ram4
 (driver?)
0105            4096 ram5
 (driver?)
0106            4096 ram6
 (driver?)
0107            4096 ram7
 (driver?)
0108            4096 ram8
 (driver?)
0109            4096 ram9
 (driver?)
010a            4096 ram10
 (driver?)
010b            4096 ram11
 (driver?)
010c            4096 ram12
 (driver?)
010d            4096 ram13
 (driver?)
010e            4096 ram14
 (driver?)
010f            4096 ram15
 (driver?)
1f00           65536 mtdblock0
 (driver?)
Kernel panic - not syncing: VFS: Unable to mount root fs on
unknown-block(0,0)

I assume this is related to the content in fstab of RaspiOS:
proc            /proc           proc    defaults          0       0
PARTUUID=907af7d0-01  /boot           vfat    defaults          0       2
PARTUUID=907af7d0-02  /               ext4    defaults,noatime  0       1

Can you please advise how to fix this error?

THX