[U-Boot-Users] Why should disable i+AF8-cache when erase SyncFlash on mx1ads

just now,i get the latest u-boot ,it has supported mx1ads,but i can not the code as follows,in board/mx1ads/flash.c: int flash_erase (flash_info_t *info, int s_first, int s_last) { int iflag, cflag, prot, sect; int rc = ERR_OK; .................... ...................... cflag = icache_status(); icache_disable(); .................. } i do not know why disable the icache when erasing the flash!