vi fs/Kconfig,找到menu "Pseudo filesystems"处增加如下:
config DEVFS_FS #config的标识
bool "/dev file system support (OBSOLETE)"
depends on EXPERIMENTAL
help
config DEVFS_MOUNT
bool "Automatically mount at boot"
depends on DEVFS_FS #依赖上面的DEVFS_FS
help
config DEVFS_DEBUG
bool "Debug devfs"
depends on DEVFS_FS #依赖上面的DEVFS_FS
help
重新make menuconfig 在File systems->Pseudo filesystems目录里面可以后到devfs的配置选项如下：
[*] /proc file system support
[*] /dev file system support (OBSOLETE)
[*] Automatically mount at boot
[*] Debug devfs
[*] Virtual memory file system support (former shm fs)
[ ] Relayfs file system support
8
修改内核启动选项, make menuconfig,
这里绝大部分选项都先采用默认设置，待移植成功后我们再进一步裁减, 以上(3)中修改了common-smdk.c, 为了让修改生效, 必须选上
还有启动参数 Boot Options ---> Default kernel command string: (注意, )
noinitrd root=/dev/mtdblock4 console=ttySAC0,115200
解释, 也就是mtdblock3是存放cramfs根文件系统的分区，故设置 root=/dev/mtdblock3. console=ttySAC0指kernel启动期间的信息都输出到串口1上.