Meraki Go GX20

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Wikipedia Cisco Systems
3rd Party Firmware
dd-wrt Status Unknown
OpenWrt Supported
Tomato any flavor Incompatible
Gargoyle Status Unknown
Platform
Brand • Model • Rev Cisco Meraki Go GX20
Type router
CPU1 checkY Qualcomm IPQ4029
CPU1 Type ARM Cortex-A7
CPU1 Speed 700 MHz ( 4 cores )
Flash1 Chip Brand? Model?
Flash1 Size 128 MiB134,217,728 B <br />1,048,576 Kib <br />131,072 KiB <br />1,024 Mib <br />0.125 GiB <br /> (NAND)
RAM1 Size 512 MiB536,870,912 B <br />4,194,304 Kib <br />524,288 KiB <br />4,096 Mib <br />0.5 GiB <br />
RAM1 Chip Brand? Model?
ETH chip1 Qualcomm IPQ4029
Switch Qualcomm Atheros QCA8075
Ethernet Port Count 1-1GbE-WAN
4-1GbE-LAN
Wired Standard IEEE 802.3i/3u/3ab
Stock bootloader U-Boot
Expansion IF types USB 3.0
USB ports 1
USB Hub Compatible Untested
Other
3rd Party Firmware Support OpenWrt • (List | Dev | DLs)

For a list of all currently documented Qualcomm chipsets with specifications, see Qualcomm.
For a list of all currently documented Qualcomm Atheros (QCA) chipsets with specifications, see Qualcomm Atheros.

For a list of all currently documented Cisco devices with specifications, see Cisco.

Links of Interest

https://documentation.meraki.com/Go/Product_Information/Meraki_Go_Datasheets/GX20_Datasheet

Flashing

Flashing OpenWrt

Target: ipq40xx
Subtarget: generic
Package architecture: arm_cortex-a7_neon-vfpv4
Supported Since Commit
Support started version: 25.12.0
Current supported version: 25.12.6
LAN Hardware: Qualcomm Atheros QCA8075
Installation method(s):
see git-commit
Recovery method(s):
see git-commit
git • >> 
ipq40xx: add support for Cisco Meraki Go GX20
This commit adds support for the Cisco Meraki Go GX20. The Go GX20 is a wired
router with 5 port Gigabit switch. It shares the same PCB as the Meraki Z3,
but without the WiFi radios.

GX20 hardware info:
* CPU: Qualcomm IPQ4029
* RAM: 512MB DDR3
* Storage: 128 MB (S34ML01G200TFV00)
* Networking: QCA8075 internal switch (5x 1GbE ports)
* USB: 1x USB3.0
* Serial: Internal header (J8, 2.54mm, populated)

Port 5 has POE output (802.3af). The Internet/WAN port is used for tftp booting
in U-Boot.

This device ships with secure boot, and cannot be flashed without
external programmers (TSOP48 NAND and I2C EEEPROM)!

Disassembly:

* Remove the four T8 screws on the bottom of the device under the rubber feet.

* Using a guitar pick or similar plastic tool, insert it on the side between
the bottom case and the side, pry up gently. The plastic bottom has several
latches around the perimeter (but none on the rear by the Ethernet ports).

* The TSOP48 NAND flash (U30, Spansion S34ML01G200TFV00) is located on the
bottom side of the PCB (facing you as you remove the bottom plastic).
To flash, you will need to desolder the TSOP48. Attempts to flash in-circuit
using a 360 clip were unsuccessful.

* The SOIC8 I2C EEPROM (U32, Atmel 24C64) is located on the bottom side of
the PCB (facing you as you remove the bottom plastic). It can be flashed in
circuit using a SOIC8 chip clip.

Installation:

The dumps to flash can be found in this repository:
https://github.com/halmartin/meraki-openwrt-docs/tree/main/z3_gx20

The device has the following flash layout (offsets with OOB data):
```
0x000000000000-0x000000100000 : "sbl1"
0x000000100000-0x000000200000 : "mibib"
0x000000200000-0x000000300000 : "bootconfig"
0x000000300000-0x000000400000 : "qsee"
0x000000400000-0x000000500000 : "qsee_alt"
0x000000500000-0x000000580000 : "cdt"
0x000000580000-0x000000600000 : "cdt_alt"
0x000000600000-0x000000680000 : "ddrparams"
0x000000700000-0x000000900000 : "u-boot"
0x000000900000-0x000000b00000 : "u-boot-backup"
0x000000b00000-0x000000b80000 : "ART"
0x000000c00000-0x000007c00000 : "ubi"
```

* Dump your original NAND (if using nanddump, include OOB data).

* Decompress `u-boot.bin.gz` dump from the GitHub repository above (dump
contains OOB data) and overwrite the `u-boot` portion of NAND from
`0x738000`-`0x948000` (length `0x210000`). Offsets here include OOB data.

* Decompress `ubi.bin.gz` dump from the GitHub repository above (dump
contains OOB data) and overwrite the `ubi` portion of NAND from
`0xc60000`-`0x8400000` (length `0x77a0000`). Offsets here include OOB data.

* Dump your original EEPROM. Change the byte at offset `0x49` to `0x1e`
(originally `0x2b`). Remember to re-write the EEPROM with the modified data.
    * This can be done on Linux via the following command:
    `printf "\x1e" | dd of=/tmp/eeprom.bin bs=1 seek=$((0x49)) conv=notrunc`

**Note**: the device will not boot if you modify the board major number and
have not yet overwritten the `ubi` and `u-boot` regions of NAND.

* Resolder the NAND after overwriting the `u-boot` and `ubi` regions.

OpenWrt Installation:

* After flashing NAND and EEPROM with external programmers. Plug an Ethernet
cable into the Internet/WAN port. Power up the device.

* The new U-Boot build uses the space character `" "` (without quotes) to
interrupt boot.

* Interrupt U-Boot and `tftpboot` the OpenWrt initramfs image from your
tftp server
```
dhcp
setenv serverip <your_tftp>
tftpboot openwrt-ipq40xx-generic-meraki_gx20-initramfs-uImage.itb
```

* Once booted into the OpenWrt initramfs, `scp` the `sysupgrade` image to
the device and run the normal `sysupgrade` procedure:
```
scp -O openwrt-ipq40xx-generic-meraki_gx20-squashfs-sysupgrade.bin root@192.168.1.1:/tmp/
ssh root@192.168.1.1 "sysupgrade -n /tmp/openwrt-ipq40xx-generic-meraki_gx20-squashfs-sysupgrade.bin"
```

* OpenWrt should now be installed on the device.

Signed-off-by: Hal Martin
Link: https://github.com/openwrt/openwrt/pull/17026
Signed-off-by: Robert Marko
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