Problem booting from HDD - Zyxel NAS326 (1 reply)

Hello again ;)

unfortunately I could not manage to boot from internal Harddisk on my brand new NAS326. After a while it boots to stock firmware.

This is how partitions and fstab look like:

/mnt # parted /dev/sda print
Model: ATA TOSHIBA DT01ACA3 (scsi)
Disk /dev/sda: 3001GB
Sector size (logical/physical): 512B/4096B
Partition Table: gpt
Disk Flags: 

Number  Start   End     Size    File system     Name    Flags
 1      1049kB  2999GB  2999GB  ext3            rootfs  boot
 2      2999GB  3001GB  2048MB  linux-swap(v1)

/mnt # blkid
/dev/ubi6_0: UUID="63a41213-ef4b-4c0c-8047-00f9368d1ec6" TYPE="ubifs"
/dev/loop0: UUID="a9027743-fe43-4399-9afa-bbe73337cada" TYPE="ext2"
/dev/sda1: UUID="eadd50eb-c549-419f-bb41-bdb280f1b002" TYPE="ext3" PARTLABEL="rootfs" PARTUUID="e2a6c269-7bf0-4a95-b6e5-86a000307579"
/dev/sda2: UUID="70c9344c-2974-4a4c-a730-d92ccf2555fa" TYPE="swap" PARTUUID="7a2c6d82-814a-416a-925e-e7e98ea86017"
/mnt # cat etc/fstab 
# UNCONFIGURED FSTAB FOR BASE SYSTEM


/dev/root      /               ext3    noatime,errors=remount-ro 0 1

/mnt # ls -la
drwxrwxrwx   22 root     root          4096 Jan 20  2017 .
drwxr-xr-x   19 root     root             0 Aug  8 12:39 ..
drwxr-xr-x    2 root     root          4096 Jan 19  2017 bin
drwxr-xr-x    3 root     root          4096 Aug  7 16:42 boot
drwxr-xr-x    4 root     root          4096 Jan  2  2017 dev
drwxr-xr-x   66 root     root          4096 Aug  8 00:27 etc
drwxr-xr-x    2 root     root          4096 Sep 12  2016 home
drwxr-xr-x   15 root     root          4096 Feb  4  2017 lib
drwx------    2 root     root         16384 Jan  9  2017 lost+found
drwxr-xr-x    2 root     root          4096 Jan 21  2017 media
drwxr-xr-x    2 root     root          4096 Jan  2  2017 mnt
drwxrwxrwx    3 root     root          4096 Aug  8 00:00 nas326
drwxr-xr-x    2 root     root          4096 Jan  2  2017 opt
drwxr-xr-x    2 root     root          4096 Sep 12  2016 proc
drwx------    4 root     root          4096 Feb  4  2017 root
drwxr-xr-x    7 root     root          4096 Jan  2  2017 run
drwxr-xr-x    2 root     root          4096 Jan 19  2017 sbin
drwxr-xr-x    2 root     root          4096 Jan  2  2017 srv
drwxr-xr-x    2 root     root          4096 Apr  7  2015 sys
drwxrwxrwt    2 root     root          4096 Feb  4  2017 tmp
drwxr-xr-x   10 root     root          4096 Jan  2  2017 usr
drwxr-xr-x   11 root     root          4096 Jan  2  2017 var
/mnt #

How could I find out what the problem is without usb-serial?

usb-serial is not attached. I could not find any doc how to attach usb-serial. Does anybody know where on the NAS326 Board to connect it?
I still have the USB-to-Serial Cable which I use for NSA325. Is this compatible to NAS326?

Thanks in advance,
Peter