Follow-up Comment #2, patch #6878 (project avr-libc):
There is a problem using r20 register: it is used to count bytes to write in
eewr_block (look in eedef.h) that uses eewr_byte function. If you use that
register you will overwrite the counter and the eeprom_write_block function
will not work anymore.
There is another point: there's no need to look for NVM busy after a buffer
erase, it will not erase eeprom locations but only the buffer.
I tested the eewr_byte function with all the write/update functions
(word/dword/block) because they all uses the byte write function.
I suggest to update the CVS with this file, no need to change the other write
and update functions.
P.S. The function 'eeprom_write_r18' uses one more scratch register, r17.
Update "readme_eeprom.txt" accordingly.
(file #18534)
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