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PCD
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Also See:
Additional
write_program_eeprom , erase_program_eeprom , Program Eeprom Overview
Clarification about the functions to write to program memory:
Notes:
In order to get the desired results while using write_program_memory(), the block
of memory being written to needs to first be read in order to save any other
variables currently stored there, then erased to clear all values in the block before
the new values can be written. This is because the write_program_memory()
function does not save any values in memory and will only erase the block if the
first location is written to. If this process is not followed, when new values are
written to the block, they will appear as garbage values.
For chips where
getenv(“FLASH_ERASE_SIZE”) > getenv(“FLASH_WRITE_SIZE”)
write_program_eeprom() - Writes 2 bytes, does not erase (use
erase_program_eeprom())
write_program_memory() - Writes any number of bytes, will erase a block
whenever the first (lowest) byte in a block is written to. If the first address is
not the start of a block that block is not erased.
erase_program_eeprom() - Will erase a block. The lowest address bits are
not used.
For chips where
getenv(“FLASH_ERASE_SIZE”) = getenv(“FLASH_WRITE_SIZE”)
write_program_eeprom() - Writes 2 bytes, no erase is needed.
write_program_memory() - Writes any number of bytes, bytes outside the
range of the write block are not changed. No erase is needed.
erase_program_eeprom() - Not available
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