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This commit adds support for the Cisco Meraki MR20/Go GR10. The Meraki MR20 is a Cisco 802.11ac/WiFi 5 AP with 1 Ethernet port. It can be powered by a 12V DC barrel jack (5.5x2.5mm, center positive) or via 802.3af POE. The Meraki Go GR10 (codename: Maggot) is identical to the MR20 (codename: Grub), so this document will refer to both devices as the MR20. MR20 hardware info: * CPU: Qualcomm IPQ4029 * RAM: 256MB DDR3 * Storage: 128 MB (MX30LF1G18AC) * Networking: 1 Gigabit Ethernet * WiFi: QCA4019 802.11b/g/n/ac * Serial: Internal header (J10, 2.54mm, unpopulated) This device ships with secure boot, and cannot be flashed without external programmers (TSOP48 NAND and I2C EEEPROM)! Disassembly: Remove the four rubber feet on the rear of the AP and the four Torx T8 screws under the feet. Using a guitar pick or similar plastic tool, insert it on the side along the seam around the edge. Push in gently while gently lifting the front of the housing to release the plastic retention clips. There are 15 clips in total. Once you have removed the plastic front (shown above already removed so you know where the clips are), remove the 4 Philips screws holding down the two metal WiFi antennas. Lift the PCB gently while pushing the Ethernet port into the housing to release it. The PCB should come free from the metal heat spreader. The TSOP48 NAND flash (U9, Macronix/MXIC MX30LF1G18AC) is located on the opposite side of the PCB. To flash, you need to desolder the TSOP48 or use a 360 clip. You also need to reprogram the I2C EEPROM (U20, Atmel 24c64). Installation: The dumps to flash can be found in this repository: https://github.com/halmartin/meraki-openwrt-docs/tree/main/mr20_gr10 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 `0x2c` or `0x25`). 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 in an Ethernet cable and 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_mr20-initramfs-uImage.itb ``` * Once booted into the OpenWrt initramfs, created the `ART` ubivol with the WiFi radio calibration from the mtd partition: ``` cat /dev/mtd10 > /tmp/ART.bin ubiupdatevol /dev/ubi0_1 /tmp/ART.bin ``` * `scp` the `sysupgrade` image to the device and run the normal `sysupgrade` procedure: ``` scp -O openwrt-ipq40xx-generic-meraki_mr20-squashfs-sysupgrade.bin root@192.168.1.1:/tmp/ ssh root@192.168.1.1 "sysupgrade -n /tmp/openwrt-ipq40xx-generic-meraki_mr20-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/20646 Signed-off-by: Robert Marko <robimarko@gmail.com> |
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