Thomas <74cmo...@gmail.com> writes:
> Hi, > > I'm trying to emulate Rpi with QEMU. > I found > [url=1]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 Let's start with the fact you are using a versatilepb machine type with a versatilepb dtb and not the rasppi model. The manual goes into more details about why you can't generally share kernels built for one ARM system on another: https://qemu.readthedocs.io/en/latest/system/target-arm.html Since that article was written we have added models for the -M raspi2 and -M raspi3 which might work better with a kernel written for it although the emulation isn't complete. > 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 -- Alex Bennée
