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FCC ID: A8J-ECB350
Engenius ECB350 v1 is an indoor wireless access point with a gigabit ethernet port,
2.4 GHz wireless, external antennas, and PoE.
**Specification:**
- AR7242 SOC
- AR9283 WLAN 2.4 GHz (2x2), PCIe on-board
- AR8035-A switch RGMII, GbE with 802.3af PoE
- 40 MHz reference clock
- 8 MB FLASH 25L6406EM2I-12G
- 32 MB RAM
- UART at J2 (populated)
- 2 external antennas
- 3 LEDs, 1 button (power, lan, wlan) (reset)
**MAC addresses:**
MACs are labeled as WLAN and WAN
vendor MAC addresses in flash are duplicate
phy0 WLAN *:b8 ---
eth0 WAN *:b9 art 0x0/0x6
**Installation:**
- if you get Failsafe Mode from failed flash:
only use it to flash Original firmware from Engenius
or risk kernel loop or halt which requires serial cable
Method 1: Firmware upgrade page:
OEM webpage at 192.168.1.1
username and password "admin"
Navigate to "Firmware" page from left pane
Click Browse and select the factory.bin image
Upload and verify checksum
Click Continue to confirm and wait 3 minutes
Method 2: Serial to load Failsafe webpage:
After connecting to serial console and rebooting...
Interrupt uboot with any key pressed rapidly
execute `run failsafe_boot` OR `bootm 0x9f670000`
wait a minute
connect to ethernet and navigate to
"192.168.1.1/index.htm"
Select the factory.bin image and upload
wait about 3 minutes
**Return to OEM:**
If you have a serial cable, see Serial Failsafe instructions
otherwise, uboot-env can be used to make uboot load the failsafe image
*DISCLAIMER*
The Failsafe image is unique to Engenius boards.
If the failsafe image is missing or damaged this will not work
DO NOT downgrade to ar71xx this way, it can cause kernel loop or halt
ssh into openwrt and run
`fw_setenv rootfs_checksum 0`
reboot, wait 3 minutes
connect to ethernet and navigate to 192.168.1.1/index.htm
select OEM firmware image from Engenius and click upgrade
**TFTP recovery** (unstable / not reliable):
rename initramfs to 'vmlinux-art-ramdisk'
make available on TFTP server at 192.168.1.101
power board while holding or pressing reset button repeatedly
NOTE: for some Engenius boards TFTP is not reliable
try setting MTU to 600 and try many times
**Format of OEM firmware image:**
The OEM software of ECB350 v1 is a heavily modified version
of Openwrt Kamikaze. One of the many modifications
is to the sysupgrade program. Image verification is performed
by the successful ungzip and untar of the supplied file
and name check and header verification of the resulting contents.
To form a factory.bin that is accepted by OEM Openwrt build,
the kernel and rootfs must have specific names
and begin with the respective headers (uImage, squashfs).
Then the files must be tarballed and gzipped.
The resulting binary is actually a tar.gz file in disguise.
This can be verified by using binwalk on the OEM firmware images,
ungzipping then untaring.
The OEM upgrade script is at /etc/fwupgrade.sh.
OKLI kernel loader is required because the OEM software
expects the kernel size to be no greater than 1536k
and otherwise the factory.bin upgrade procedure would
overwrite part of the kernel when writing rootfs.
The factory upgrade script follows the original mtd partitions.
**Note on PLL-data cells:**
The default PLL register values will not work
because of the AR8035 switch between
the SOC and the ethernet port.
For AR724x series, the PLL register for GMAC0
can be seen in the DTSI as 0x2c.
Therefore the PLL register can be read from u-boot
for each link speed after attempting tftpboot
or another network action using that link speed
with `md 0x1805002c 1`
However the registers that u-boot sets are not ideal and sometimes wrong...
the at803x driver supports setting the RGMII clock/data delay on the PHY side.
This way the pll-data register only needs to handle invert and phase.
for this board no extra adjustements are needed on the MAC side
all link speeds functional
Signed-off-by: Michael Pratt <mcpratt@pm.me>
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