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Re: raspi3b - dumpdtb

From: Philippe Mathieu-Daudé
Subject: Re: raspi3b - dumpdtb
Date: Wed, 15 Mar 2023 16:20:46 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.8.0

Hi Little,

On 15/3/23 13:43, Little Tree wrote:
I am using QEMU 6.2.0 to emulate raspi3b (Raspberry Pi 3b). I have used the following command to dump the DTB. It is neither terminating nor dumping the DTB.

$ qemu-system-aarch64 -machine raspi3b,dumpdtb=test.dtb
VNC server running on <>

If I change the machine to 'virt' as shown below, it dumps the DTB and exits. May I know the reason for this? How can I dump the DTB of the raspi3b machine?

While the 'virt' machine _constructs_ a machine adapted to the command
line options, it *produces* the equivalent DTB.

The raspi machines in contrast are not virtual machines, they respect
the physical hardware. Therefore they *consume* already existing dtb
blobs (with the -dtb command line argument).

See for example the test_arm_raspi2_initrd() test in
tests/avocado/boot_linux_console.py which uses the bcm2709-rpi-2-b.dtb
blob file.

$qemu-system-aarch64 -machine virt,dumpdtb=test.dtb
qemu-system-aarch64: info: dtb dumped to test.dtb. Exiting.

Thanks a lot,



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