# Linux Kernel Module Cheat
The perfect emulation setup to study and develop the <<linux-kernel>> v5.9.2, kernel modules, <<qemu-buildroot-setup,QEMU>>, <<gem5-buildroot-setup,gem5>> and x86_64, ARMv7 and ARMv8 <<userland-assembly,userland>> and <<baremetal-setup,baremetal>> assembly, <<c,ANSI C>>, <<cpp,C++>> and <<posix,POSIX>>. <<gdb>> and <<kgdb>> just work. Powered by <<about-the-qemu-buildroot-setup,Buildroot>> and <<about-the-baremetal-setup,crosstool-NG>>. Highly automated. Thoroughly documented. Automated <<test-this-repo,tests>>.

##### 14.2.2.1. QEMU graphic mode arm terminal

TODO: on arm, we see the penguin and some boot messages, but don’t get a shell at then end:

    ./run --arch aarch64 --graphic

I think it does not work because the graphic window is DRM only, i.e.:

    cat /dev/urandom > /dev/fb0

fails with:

    cat: write error: No space left on device

and has no effect, and the Linux kernel does not appear to have a built-in DRM console as it does for fbdev with fbcon.

There is however one out-of-tree implementation: kmscon.