拨码开关
配置说明
拨码示例
NAND flash
In case the NAND memory is the boot devices, this implies that the boot partition must be organized in order fulfill the bootrom requirements. Specifically, it contains:
- A 1MB area (named Flash Control Block, FCB) which, in turn, includes
- A data structure called NAND Control Block (NCB)
- Three addresses which indicate where are located
- The Discovered Bad Block Table (DBBT) which is the data structure used to manage the bad blocks of the NAND flash
- The first copy of the firmware to load
- The second (redundant) copy of the firmware to load
- The DBBT
- The first copy of the firmware
- The second copy of the firmware.
u-boot对于Kernel和DTB区域中的坏块进行管理，rootfs中的坏块由UBIFS文件系统进行处理。