I think unless you can either (a) show that QEMU is behaving differently from the real hardware or (b) point at what bit of the hardware documentation QEMU's implementation is not following, then this doesn't really sound like it's a bug in QEMU.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1914535 Title: PL110 8-bit mode is not emulated correctly Status in QEMU: New Bug description: When the emulated pl110/pl111 is switched programmatically to 8-bit color depth mode, the display is drawn green and blue, but the real PL110 displays grayscale in 8-bit mode. The bug appears in qemu-system-arm version 3.1.0 (Debian 1:3.1+dfsg-8+deb10u8) and qemu-system-arm version 5.2.50 (v5.2.0-1579-g99ae0cd90d). To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1914535/+subscriptions