Faster flash_eraseall for NOR flash

[Øyvind Harboe]

I don't think this feature is going to work very well as-is.

To make this effective in real life, I think I'll have to add in an
option to read in a binary file, which is written to flash after
erase.

Only those erase blocks which changed should be
erased + written.

The cleanmarkers would be written for erase blocks after
the end of the binary file.

This fixes two things: even faster for blocks that don't change,
if the cleanmarker is not supposed to be there for certain
blocks, then it will currently fail.

-- 
Øyvind Harboe

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