리눅스 마운트 에러 시 can't open /dev/ttySAC1

리눅스 마운트 에러 시 can't open /dev/ttySAC1

 buildroot 파일 시스템 사용시 

[    6.551683] Freeing init memory: 224K

can't open /dev/null: No such file or directory

can't open /dev/null: No such file or directory

can't open /dev/null: No such file or directory

can't open /dev/null: No such file or directory

can't open /dev/null: No such file or directory

can't open /dev/null: No such file or directory

Starting logging: OK

Populating /dev using udev: /etc/init.d/S10udev: line 31: /proc/sys/kernel/hotplug: No such file or directory

cannot open /dev/null

done

Starting portmap: portmap: fork: No such file or directorydone

Starting watchdog...

Starting system message bus: Unknown group "lp" in message bus configuration file

done

Loading marvell SD8787 wifi/BT driver

[    7.237204] mlan: module license 'Marvell Proprietary' taints kernel.

[    7.238005] Disabling lock debugging due to kernel taint

Starting network...

[    7.390044] smsc911x smsc911x.1: eth0: SMSC911x/921x identified at 0xeed20000, IRQ: 364

udhcpc (v1.20.2) started

Sending discover...

Sending discover...

Sending discover...

No lease, failing

cp: cannot stat '/root/resolv.conf': No such file or directory

Starting lighttpd: OK

Generating RSA Key...

Couldn't open /dev/null: No such file or directory

Generating RSA Key...

Couldn't open /dev/null: No such file or directory

Generating DSA Key...

THIS CAN TAKE A MINUTE OR TWO DEPENDING ON YOUR PROCESSOR!

Couldn't open /dev/null: No such file or directory

Generating ECDSA Key...

THIS CAN TAKE A MINUTE OR TWO DEPENDING ON YOUR PROCESSOR!

Couldn't open /dev/null: No such file or directory

Starting sshd: Couldn't open /dev/null: No such file or directory

OK

Starting NFS statd: Cannot register service: RPC: Unable to receive; errno = Connection refused

done

Starting NFS services: Cannot register service: RPC: Unable to receive; errno = Connection refused

done

Starting NFS daemon: rpc.nfsd: Unable to access /proc/fs/nfsd errno 2 (No such file or [   17.205532] svc: failed to register nfsdv2 RPC service (errno 111).

[   17.209233] svc: failed to register nfsaclv2 RPC service (errno 111).

[   17.215636] nfsd: last server has exited, flushing export cache

directory).

Please try, as root, 'mount -t nfsd nfsd /proc/fs/nfsd' and then restart rpc.nfsd to correct the problem

done

Starting NFS mountd: Cannot register service: RPC: Unable to receive; errno = Connection refused

done

Starting vsftpd: OK

Starting HPA's tftpd: /etc/init.d/S80tftpd-hpa: line 20: /usr/sbin/in.tftpd: No such file or directory

Starting SMB services: done

Starting NMB services: done

can't open /dev/ttySAC1: No such file or directory

can't open /dev/ttySAC1: No such file or directory

can't open /dev/ttySAC1: No such file or directory

can't open /dev/ttySAC1: No such file or directory

can't open /dev/ttySAC1: No such file or directory

커널에서

x                 [*] Maintain a devtmpfs filesystem to mount at /dev                                    x x

  x x                 [*]   Automount devtmpfs at /dev, after the kernel mounted the rootfs

하고 다시 해 보자