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Specifications:
- Device: DNA Valokuitu Plus EX400
- SoC: MT7621A
- Flash: 256MB NAND
- RAM: 256MB
- Ethernet: Built-in, 2 x 1GbE
- Wifi: MT7603 2.4 GHz, MT7615 5 GHz (4x internal antennas)
- USB: 1x 3.0
- LED: 1x green/red, 1x green
- Buttons: Reset
MAC addresses:
- LAN: u-boot 'ethaddr' (label)
- WAN: label + 1
- 2.4 GHz: label + 6
- 5 GHz: label + 7
Serial:
There is a black block connector next to the red ethernet connector. It
is accessible also through holes in the casing.
Pinout (TTL 3.3V)
+---+---+
|Tx |Rx |
+---+---+
|Vcc|Gnd|
+---+---+
Firmware:
The vendor firmware is a fork of OpenWrt (Reboot) with a kernel version
4.4.93. The flash is arranged as below and there is a dual boot
mechanism alternating between rootfs_0 and rootfs_1.
+-------+------+------+-----------+-----------+
| | env1 | env2 | rootfs_0 | rootfs_1 |
| +------+------+-----------+-----------+
| | UBI volumes |
+-------+-------------------------------------+
|U-Boot | UBI |
+-------+-------------------------------------+
|mtd0 | mtd1 |
+-------+-------------------------------------+
| NAND |
+---------------------------------------------+
In OpenWrt rootfs_0 will be used as a boot partition that will contain the
kernel and the dtb. The squashfs rootfs and overlay are standard OpenWrt
behaviour.
+-------+------+------+-----------+--------+------------+
| | env1 | env2 | rootfs_0 | rootfs | rootfs_data|
| +------+------+-----------+--------+------------+
| | UBI volumes |
+-------+-----------------------------------------------+
|U-Boot | UBI |
+-------+-----------------------------------------------+
|mtd0 | mtd1 |
+-------+-----------------------------------------------+
| NAND |
+-------------------------------------------------------+
U-boot:
With proper serial access booting can be halted to U-boot by pressing any
key. TFTP and flash writes are available, but only the first one has been
tested.
NOTE: Recovery mode can be accessed by holding down the reset button while
powering on the device. The led 'Update' will show a solid green light
once ready. A web server will be running at 192.168.1.1:80 and it will
allow flashing a firmware package. You can cycle between rootfs_0 and
rootfs_1 by pressing the reset button once.
Root password:
With the vendor web UI create a backup of your settings and download the
archive to your computer. Within the archive in the file
/etc/shadow replace the password hash for root with that of a password you
know. Restore the configuration with the vendor web UI and you will have
changed the root password.
SSH access:
You might need to enable the SSH service for LAN interface as by default
it's enabled for WAN only.
Installing OpenWrt:
With the vendor web UI install the OpenWrt factory image. Alternatively,
ssh to the device and use sysupgrade -n from cli.
Finalize by installing the OpenWrt sysupgrade image to get a fully
functioning system.
Reverting to the vendor firmware:
Boot with OpenWrt initramfs image
- Remove volumes rootfs_0, rootfs and rootfs_data and create vendor
volumes.
ubirmvol /dev/ubi0 -n 2
ubirmvol /dev/ubi0 -n 3
ubirmvol /dev/ubi0 -n 4
ubimkvol /dev/ubi0 -N rootfs_0 -S 990
ubimkvol /dev/ubi0 -N rootfs_1 -S 990
Power off and enter to the U-boot recovery to install the vendor
firmware.
Known issues:
- MACs for wifi are stored in currently unknown place but it seems
to persist over power-off. They might be stored on the chip.
Signed-off-by: Mauri Sandberg <maukka@ext.kapsi.fi>
[rmilecki: try NVMEM for MACs]
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
45 lines
1.6 KiB
Bash
45 lines
1.6 KiB
Bash
#
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# Copyright (C) 2023 Mauri Sandberg
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#
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# The vendor UBI is split in volumes 0-3. Volumes 0 and 1 contain U-Boot
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# environments env1 and env2, respectively. The vendor root file systems
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# are in volumes 2 (rootfs_0) and 3 (rootfs_1). Drop the two roots and
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# explicitly use rootfs_0 as a boot partition that contains the dtb and the
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# OpenWrt kernel. This is because the vendor U-Boot expects to find them there.
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# Then continue upgrade with the default method - a SquashFS rootfs will be
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# installed and the rest of UBI will be used as an overlay.
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# The 'kernel' inside the sysupgrage.tar is an UBIFS image that contains
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# /boot/dtb and /boot/kernel. The 'root' is an OpenWrt SquashFS root
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. /lib/functions.sh
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. /lib/upgrade/nand.sh
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dna_do_upgrade () {
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tar -xaf $1
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# get the size of the new bootfs
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local _bootfs_size=$(wc -c < ./sysupgrade-dna_valokuitu-plus-ex400/kernel)
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[ -n "$_bootfs_size" -a "$_bootfs_size" -gt "0" ] || nand_do_upgrade_failed
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# remove existing rootfses and recreate rootfs_0
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ubirmvol /dev/ubi0 --name=rootfs_0 > /dev/null 2>&1
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ubirmvol /dev/ubi0 --name=rootfs_1 > /dev/null 2>&1
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ubirmvol /dev/ubi0 --name=rootfs > /dev/null 2>&1
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ubirmvol /dev/ubi0 --name=rootfs_data > /dev/null 2>&1
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ubimkvol /dev/ubi0 --type=static --size=${_bootfs_size} --name=rootfs_0
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# update the rootfs_0 contents
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local _kern_ubivol=$( nand_find_volume "ubi0" "rootfs_0" )
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ubiupdatevol /dev/${_kern_ubivol} sysupgrade-dna_valokuitu-plus-ex400/kernel
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fw_setenv root_vol rootfs_0
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fw_setenv boot_cnt_primary 0
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fw_setenv boot_cnt_alt 0
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# proceed to upgrade the default way
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CI_KERNPART=none
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nand_do_upgrade "$1"
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}
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