RT809H

在uboot启动时，会快速扫描NandFlash上的坏块并在内存中建立坏块表。 这个过程由下面的函数完成：. /** * create_bbt - [GENERIC] Create a bad block table ...

Another strange thing we notice is that re-flashing only the u-boot (and nothing else) have made the bad block on the initramfs partition disappear. To flash ...

Hi, I have a few questions on bad block management on NAND device as done by u-boot (2009-03) and kernel (2.6.30-rc6) and would appreciate any responses to help ...

U-Boot only checks for bad block markers in the first two pages of an eraseblock. There is even a flag NAND_BBT_SCANALLPAGES, but it is not the default option.

Generally speaking, when you format the ubi partition, UBIFS will manage the bad blocks correctly. And at a lower level, NAND driver also ...

就是chip 之中有可以讀取後，會無法還原成原本數值的block，會分成：. factory-bad: 指的是出廠就已經出現問題的bad block; worn-out: 即使用多次erase 後 ...

What I am trying to do is test the board to see how many bad blocks it can handle before failing. Is the way I mark the bad blocks correct?

Online forums may recommend use of command called 'nand scrub', which will erase 'bad' markings from BBT and if any application tries to read/write that block ...

The presence of factory bad blocks in NAND flash is as much based on technology as is the occurrence of further bad blocks during the lifetime.