Ralf Kleineisel wrote:
Charlie Ferrero wrote:

  
Did you ever get to the bottom of this?  I have also had zero success in 
getting a white background.  I've tried setting both 0x4b and 0x4a 
polygons to white and neither has an effect.
    

In the TYP file for my topo map Germany I set 0x4b (Background coverage)
and 0x10d01 (Basemap coverage area) to white and it works fine on my
eTrex and in mapsource. Both have the lowest drawing level.

You can get the typ and the mkgmap style here:
http://www.kleineisel.de/blogs/index.php/osmmap/2009/09/17/how-to-make-a-topographic-map
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I also have no problem - well the restriction being that 500m upwards (on medium detail) the white background disappears.