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Hardware: CPU: MediaTek MT7621AT (2x880MHz) RAM: 512MB DDR3 FLASH: 256MB NAND WiFi: 2.4GHz 4x4 MT7615 b/g/n (Needs driver, See Issues!) WiFI: 5GHz 4x4 MT7615 a/n/ac (Needs driver, See Issues!) USB: 1x 3.0 ETH: 1x WAN 10/100/1000 3x LAN 10/100/1000 LED: Power/Status BTN: RESET UART: 115200 8n1 Partition layout and boot: Stock Xiaomi firmware has the MTD split into (among others) - kernel0 (@0x200000) - kernel1 (@0x600000) - rootfs0 - rootfs1 - overlay (ubi) Xiaomi uboot expects to find kernels at 0x200000 & 0x600000 referred to as system 1 & system 2 respectively. a kernel is considered suitable for handing control over if its linux magic number exists & uImage CRC are correct. If either of those conditions fail, a matching sys'n'_fail flag is set in uboot env & a restart performed in the hope that the alternate kernel is okay. If neither kernel checksums ok and both are marked failed, system 2 is booted anyway. Note uboot's tftp flash install writes the transferred image to both kernel partitions. Installation: Similar to the Xiaomi MIR3G, we keep stock Xiaomi firmware in kernel0 for ease of recovery, and install OpenWRT into kernel1 and after. The installation file for OpenWRT is a *squashfs-factory.bin file that contains the kernel and a ubi partition. This is flashed as follows: nvram set flag_try_sys1_failed=1 nvram set flag_try_sys2_failed=0 nvram commit dd if=factory.bin bs=1M count=4 | mtd write - kernel1 dd if=factory.bin bs=1M skip=4 | mtd write - rootfs0 reboot Reverting to stock: The part of stock firmware we've kept in kernel0 allows us to run stock recovery, which will re-flash stock firmware from a *.bin file on a USB. For this we do the following: fw_setenv flag_try_sys1_failed 0 fw_setenv flag_try_sys2_failed 1 reboot After reboot the LED status light will blink red, at which point pressing the 'reset' button will cause stock firmware to be installed from USB. Issues: OpenWRT currently does not have support for the MT7615 wifi chips. There is ongoing work to add mt7615 support to the open source mt76 driver. Until that support is in place, there are closed-source kernel modules that can be used. See: https://forum.openwrt.org/t/support-for-xiaomi-wifi-r3p-pro/20290/170 Signed-off-by: Ozgur Can Leonard <ozgurcan@gmail.com> Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [02_network remaps, Added link to notes] |
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