[Qemu-devel] [Bug 1778182] Re: 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]

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

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https://bugs.launchpad.net/bugs/1778182

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

Status in QEMU:
  New

Bug description:
  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.

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