在产品的实际使用过程中，多次出现丢失ResidentFlash目录的现象，因为在写Flash时OS要先整理磁盘，如果这时掉电就可能烧坏Flash，为了防止这种故障隐患，修改了NandFlash驱动。通过修改NandFlash驱动，限制用户应用程序访问受限区域（nboot区域，toc区域，eboot区域，nk镜像区域，OEM区域），让这些区域被写保护，以达到保护flash的目的。-Products used in the actual process, the repeated loss of ResidentFlash directory phenomenon, because in writing when the OS first collated Flash disk, if at this time may be burned down Flash, in order to prevent such failures hidden amended the NANDFLASH drive . By modifying the NANDFLASH drive to restrict the user application to access restricted region (nboot region, toc region, eboot region, nk mirror region, OEM region), so that these areas are write-protected, so as to achieve the purpose of protection of flash.