Boot menu for u-boot (GTA02)

Werner Almesberger werner at
Wed Jan 30 11:23:35 CET 2008

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.

- Werner

----------------------------------- Changes -----------------------------------

- drivers/video/cfb_console.c (process_sequence): to clear the screen just 
  clear the screen, instead of slowly scrolling away its content 

- board/neo1973/gta02/gta02.c (board_late_init): enabled boot menu invocation
- board/neo1973/gta02/gta02.c (board_late_init): call "neo1973_bootmenu", not
  the platform-independent "bootmenu"
- board/neo1973/gta02/gta02.c (neo1973_aux_key_pressed): AUX polarity is
  reversed in GTA02

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