Boot menu for u-boot (GTA02)

[Andy Green]

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Somebody in the thread at some point said:
> With revision 3982, GTA02 now also has a boot menu, just like GTA01
> and HXD8.
> 
> Since the Glamo is very slow if used as a dumb frame buffer, we also
> have to accelerate the clearing of the screen. I've tried to make
> hardware acceleration work, but that turned out to be too much of an
> uphill battle. So I've just replaced the scrolling with a direct
> clearing of the screen.

Wow was that even worth considering to do?  This is just U-Boot, we can
live without accelerated graphics *boggle*

- -Andy
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