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Must my bootloader be aware of NAND FLASH ?

April 26, 2017bootloader Flash NAND

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Must my bootloader be aware of NAND FLASH ?

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Yes, if you use your bootloader to erase the FLASH chip and copy a filesystem image to it. For erase make sure, that you don’t erase factory-marked bad blocks. They are marked in the 6th byte (offset 0x5) in the out of band area of the first page of a block. The block is bad, if any bit in this byte is zero. If you erase such a block, the bad block information is erased too and lost. Further use of this block will lead to erroneous results For JFFS2 filesystems it’s recommended to programm the JFFS2 erased marker into the out of band area of the first page in each erased block after erasing the block. Do not program it into the data area of the page !