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ipq40xx: add support for Cisco Meraki Go GX20

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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 <hal.martin@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/17026
Signed-off-by: Robert Marko <robimarko@gmail.com>
This commit is contained in:
Hal Martin 2025-10-19 12:13:54 +02:00 • committed by Robert Marko
parent 60bbf46930
commit 11f7aa122a
5 changed files with 113 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
target/linux/ipq40xx/base-files/etc/board.d/01_leds
View file

@ -96,6 +96,7 @@ mobipromo,cm520-79f)
ucidef_set_led_netdev "lan1" "LAN1" "blue:lan1" "lan1"
ucidef_set_led_netdev "lan2" "LAN2" "blue:lan2" "lan2"
;;
meraki,gx20 |\
meraki,z3)
ucidef_set_led_netdev "wan_link" "WAN (link)" "green:wan-0" "wan" "link"
ucidef_set_led_netdev "wan_act" "WAN (txrx)" "green:wan-1" "wan" "tx rx"

1
target/linux/ipq40xx/base-files/etc/board.d/02_network
View file

@ -29,6 +29,7 @@ ipq40xx_setup_interfaces()
zyxel,nbg6617)
ucidef_set_interfaces_lan_wan "lan1 lan2 lan3 lan4" "wan"
;;
meraki,gx20|\
meraki,z3)
ucidef_set_interfaces_lan_wan "lan2 lan3 lan4 lan5" "wan"
;;

1
target/linux/ipq40xx/base-files/etc/board.d/03_gpio_switches
View file

@ -21,6 +21,7 @@ cilab,meshpoint-one)
compex,wpj428)
ucidef_add_gpio_switch "sim_card_select" "SIM card select" "3" "0"
;;
meraki,gx20|\
meraki,z3)
ucidef_add_gpio_switch "lan5_poe_disable" "LAN5 PoE disable" "540" "0"
;;

1
target/linux/ipq40xx/base-files/lib/upgrade/platform.sh
View file

@ -183,6 +183,7 @@ platform_do_upgrade() {
CI_KERNPART="part.safe"
nand_do_upgrade "$1"
;;
meraki,gx20|\
meraki,z3)
# DO NOT set CI_KERNPART to part.safe,
# that is used for chain-loading an unlocked u-boot

109
target/linux/ipq40xx/files-6.12/arch/arm/boot/dts/qcom/qcom-ipq4029-gx20.dts Normal file
View file

@ -0,0 +1,109 @@
// SPDX-License-Identifier: GPL-2.0-only
// Device Tree Source for Meraki Go GX20 (Fairyfly)
#include "qcom-ipq4029-wired-qca-common.dtsi"
/ {
model = "Meraki Go GX20 Router";
compatible = "meraki,gx20";
leds {
compatible = "gpio-leds";
power_orange: power {
color = <LED_COLOR_ID_AMBER>;
function = LED_FUNCTION_POWER;
gpios = <&tlmm 49 GPIO_ACTIVE_LOW>;
panic-indicator;
};
led-1 {
/* WAN left */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_WAN;
function-enumerator = <0>;
gpios = <&tlmm 46 GPIO_ACTIVE_LOW>;
};
led-2 {
/* WAN right */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_WAN;
function-enumerator = <1>;
gpios = <&tlmm 30 GPIO_ACTIVE_LOW>;
};
led-3 {
/* port 2 left */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <2>;
gpios = <&tlmm 23 GPIO_ACTIVE_LOW>;
};
led-4 {
/* port 2 right */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <3>;
gpios = <&tlmm 22 GPIO_ACTIVE_LOW>;
};
led-5 {
/* port 3 left */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <4>;
gpios = <&tlmm 25 GPIO_ACTIVE_LOW>;
};
led-6 {
/* port 3 right */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <5>;
gpios = <&tlmm 24 GPIO_ACTIVE_LOW>;
};
led-7 {
/* port 4 left */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <6>;
gpios = <&tlmm 29 GPIO_ACTIVE_LOW>;
};
led-8 {
/* port 4 right */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <7>;
gpios = <&tlmm 26 GPIO_ACTIVE_LOW>;
};
led-9 {
/* port 5 left */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <8>;
gpios = <&tlmm 33 GPIO_ACTIVE_LOW>;
};
led-10 {
/* port 5 right */
color = <LED_COLOR_ID_GREEN>;
function = LED_FUNCTION_LAN;
function-enumerator = <9>;
gpios = <&tlmm 32 GPIO_ACTIVE_LOW>;
};
};
};
/* GX20 does not have WiFi radios */
&wifi0 {
status = "disabled";
};
&wifi1 {
status = "disabled";
};