Checking OS loads

[Mitch Bradley]

Scott -

To help diagnose the problem you're having with getting the OS image 
onto the NAND FLASH, I've written a NAND image checker.  It compares 
what is on the NAND FLASH with the disk file.

http://dev.laptop.org/~wmb/chknand.fth

I'm going to add this function to an upcoming firmware build, but for 
now you can load it manually.

To use it, put that file onto a USB key, and

 ok  fload disk:\chknand.fth
 ok  verify-nand disk:\boot\nand285.img

I'm going to write a block-by-block USB disk image verifier too.  Stay 
tuned.

Mitch