On Sat, 12 Oct 2019 at 13:30, Oleksii Kurochko <oleksii.kuroc...@gmail.com> wrote: > First I successfully booted it without dtb flag in the next way: > qemu-system-aarch64 -M virt -cpu cortex-a57 -nographic -m 2048 -kernel > kernel/arch/arm64/boot/Image -append "console=ttyAMA0"
Yes, this is the expected way to use the 'virt' board. > After that I decided to dump dtb that is generated inside Qemu: > qemu-system-aarch64 -M virt,dumpdtb=virt.dtb -cpu cortex-a57 -nographic -m > 2048 -kernel kernel/arch/arm64/boot/Image -append "console=ttyAMA0" > > Finally I tried to boot it with dumped dtb: > qemu-system-aarch64 -M virt -cpu cortex-a57 -nographic -m 2048 -kernel > kernel/arch/arm64/boot/Image -append "console=ttyAMA0 > " -dtb virt.dtb > But I did not see any messages. Hmm. In theory that's supposed to work, but it's a bit of an odd thing to do -- generally you just let the virt board autogenerate the DTB and you don't need to use the -dtb option at all. (If you do this it's important that the options you pass to the qemu binary when you do the dumpdtb exactly match the ones you use when you later use the virt.dtb, but it seems like you're doing that.) thanks -- PMM
