Intel: Writing data to flash memory using EPCS Flash Controller. If you write using alt_write_flash(), data in unintended locations will be erased. Why?

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Intel: EPCS Flash Controller is used to write data to flash memory. Writing using alt_write_flash() will erase data at unintended locations. Why?

Nios II

Category: Nios® II
Tools: Nios® II EDS
device:-

alt_write_flash() Erases the target block and then writes data only to the specified offset address.
At that time, the data of the address not written is not written back.

Reference information
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/hb/nios2/n2sw_nii5v2gen2.pdf
(Search for alt_flash_write or alt_flash_write_block.)

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