[syslinux] vesamenu.c32 retain image

[H. Peter Anvin]

Tomas M wrote:
> Hello.
> 
> vesamenu.c32 can currently display a PNG image along the menu.
> But when the kernel is started, the image is lost.
> 
> LILO supports bmp-retain option, where the bitmap graphic is retained 
> when control is passed to the loaded kernel image; i.e., the screen is 
> not blanked to alphanumeric mode before starting the kernel.
> 
> Is it possible for vesamenu.c32 (or syslinux in general) to support 
> similar functionality?
> 
> This would be very handy replacement of all the 
> bootsplash/gensplash/whatever kernel patches.
> 
> Thank you very much for consideration!
> 

It's a bit messy, because syslinux will reset the screen in order to 
write the "Loading" message; however, it's just a matter of sorting out 
the proper loose ends.

I think I'd like to leave this for post-3.52, but that doesn't mean I'm 
rejecting the idea, just that I'd like to get 3.52 out the door.

	-hpa