qemu-system-aarch64 shows black framebuffer window on minimal bare metal example on SDL but not on VNC

[Ciro Santilli 六四事件 法轮功]

QEMU v2.12.0, Ubuntu 18.04 host.

Build QEMU and the bare metal image exactly as described at: https://raspberrypi.stackexchange.com/revisions/85135/4 with:

Then cd into example 09_framebuffer.

Now if I do:

../../qemu/aarch64-softmmu/qemu-system-aarch64 -M raspi3 -kernel kernel8.img -serial stdio

the SDL window shows up black.

However, if I use VNC:

../../qemu/aarch64-softmmu/qemu-system-aarch64 -M raspi3 -kernel kernel8.img -serial stdio -vnc :1
vinagre :5901

an image of Homer Simpson appears as expected.

Therefore, I think this must be a QEMU / SDL bug instead of the repository, since we get different behaviors with `-vnc` and with SDL.

[Ciro Santilli 六四事件 法轮功 (cirosantilli)]

Things that work:

- https://github.com/cirosantilli/linux-kernel-module-cheat/tree/741f5215e9515c0d7179671f49fe1781f94e70e3#graphic-mode-arm which shows the Penguin with the Linux kernel, after hacking that repo up to use the exact same QEMU executable as reported here
- the UART examples on the image repo: https://github.com/bztsrc/raspi3-tutorial/tree/9e5611a624b3037788d5b29d951304938bff13ea/05_uart0

[Peter Maydell (pmaydell)]

Works for me with both the GTK display and '-display sdl' with current head-of-git QEMU...

[Peter Maydell (pmaydell)]

Hi; I'm moving this bug to 'incomplete', because I was never able to repro it -- gtk and sdl displays both worked for me.

[Launchpad Janitor (janitor)]

[Expired for QEMU because there has been no activity for 60 days.]