问题
I am trying to draw things on the screen without an X11 server. (I want my program to be in initrd, so I don't want to bloat it with X11.)
It's easy when I have /dev/fb0, but when I use Xen, I don't have it (also I am not sure how that works - the passing of vesafb to the kernel by grub and such).
I've tried SDL but it won't work without /dev/fb0 or X11. How does X11 work without /dev/fb0? It seems like no matter what I do X11 will always work... yet all libraries (like directfb, SDL, etc.) will fail.
回答1:
the /dev/fb0 handeling with kernel. you must enable:
- CONFIG_FRAMEBUFFER_CONSOLE if you want to enable 'df' for console
- CONFIG_DRM and VGA card driver in this.
- FB and your VGA card driver in this.
来源：https://stackoverflow.com/questions/20720134/put-graphics-on-the-screen-without-dev-fb0