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FE的 坏字节处理,错误字节编辑器添加到FE_737

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admin 发表于 2018-2-28 13:53:48 | 显示全部楼层 |阅读模式 打印 上一主题 下一主题
Software bad bytes
[size=13.3333px]Some memory chips have broken bytes at pages
[size=13.3333px]Controller can not use this bytes to store data
[size=13.3333px]So it skip this bytes



[size=13.3333px]Flash-Extractor expects that data is sequential
[size=13.3333px]So we must cut unused bytes
[size=13.3333px]And fill free space at end of page with ff to keep same page size



Hardware bad bytes

[size=13.3333px]Some memory chips is tested at factory
[size=13.3333px]List of bad bytes positions gen be read from chip with special command
[size=13.3333px]NAND_Reader read this positions and store them in 01_01.dump.bb file
[size=13.3333px]Then we can use "Cut bad bytes" step in mix editor to remove bad bytes

Software bad bytes

[size=13.3333px]Some controllers test memory chips by its own method
[size=13.3333px]They form list of bad bytes and store it somewhere in memory
[size=13.3333px]We do not know where they store it
[size=13.3333px]And can not use it to remove bad bytes

[size=13.3333px]So, before use Flash Extractor,
[size=13.3333px]we need find positions of bad bytes and remove them


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