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ramips: improve Xiaomi Mi Router 3G support
This commit improves support for the Xiaomi Mi Router 3G originally added in commit 6e283cd Improvements: - Remove software watchdog as hardware watchdog now working as per commit 3fbf3ab for all mt7621 devices. - Reset button polarity corrected - length of press determines reboot (short press) vs. reset to defaults (long press) behaviour. - Enable GPIO amber switch port LEDs on board rear - lit indicates 1Gbit link and blink on activity. Green LEDs driven directly by switch indicating any link speed and tx activity. - USB port power on/off GPIO exposed as 'usbpower' - Add access to uboot environment settings for checking/setting uboot boot order preference from user space. Changes: - Front LED indicator is physically made of independent Yellow/Amber, Red & Blue LEDs combined via a plastic 'lightpipe' to a front panel indicator, hence the colour behaviour is similar to an RGB LED. RGB LEDs are not supported at this time because they produce colour results that do not then match colour labels, e.g. enabling 'mir3g:red' and 'mir3g:blue' would result in a purple indicator and we have no such label for purple. The yellow, red & blue LEDs have been split out as individual yellow, red & blue status LEDs, with yellow being the default status LED as before and with red's WAN and blue's USB default associations removed. - Swapped order of vlan interfaces (eth0.1 & eth0.2) to match stock vlan layout. eth0.1 is LAN, eth0.2 is WAN - Add 'lwlll' vlan layout to mt7530 switch driver to prevent packet leakage between kernel switch init and uci swconfig uboot behaviour & system 'recovery' uboot expects to find bootable kernels at nand addresses 0x200000 & 0x600000 known by uboot as "system 1" and "system 2" respectively. uboot chooses which system to hand control to based on 3 environment variables: flag_last_success, flag_try_sys1_failed & flag_try_sys2_failed last_success represents a preference for a particular system and is set to 0 for system 1, set to 1 for system 2. last_success is considered *if* and only if both try_sys'n'_failed flags are 0 (ie. unset) If *either* failed flags are set then uboot will attempt to hand control to the non failed system. If both failed flags are set then uboot will check the uImage CRC of system 1 and hand control to it if ok. If the uImage CRC of system is not ok, uboot will hand control to system 2 irrespective of system 2's uImage CRC. NOTE: uboot only ever sets failed flags, it *never* clears them. uboot sets a system's failed flag if that system's was selected for boot but the uImage CRC is incorrect. Fortunately with serial console access, uboot provides the ability to boot an initramfs image transferred via tftp, similarly an image may be flashed to nand however it will flash to *both* kernels so a backup of stock kernel image is suggested. Note that the suggested install procedure below set's system 1's failed flag (stock) thus uboot ignores the last_success preference and boots LEDE located in system 2. Considerable thought has gone into whether LEDE should replace both kernels, only one (and which one) etc. LEDE kernels do not include a minimal rootfs and thus unlike the stock kernel cannot include a method of controlling uboot environment variables in the event of rootfs mount failure. Similarly uboot fails to provide an external mechanism for indicating boot system failure. Installation - from stock. Installation through telnet/ssh: - copy lede-ramips-mt7621-mir3g-squashfs-kernel1.bin and lede-ramips-mt7621-mir3g-squashfs-rootfs0.bin to usb disk or wget it from LEDE download site to /tmp - switch to /extdisks/sda1/ (if copied to USB drive) or to /tmp if wgetted from LEDE download site - run: mtd write lede-ramips-mt7621-mir3g-squashfs-kernel1.bin kernel1 - run: mtd write lede-ramips-mt7621-mir3g-squashfs-rootfs0.bin rootfs0 - run: nvram set flag_try_sys1_failed=1 - run: nvram commit - run: reboot Recovery - to stock. Assuming you used the above installation instructions you will have a stock kernel image in system 1. If it can be booted then it may be used to perform a stock firmware recovery, thus erasing LEDE completely. From a 'working' LEDE state (even failsafe) Failsafe only: - run: mount_root - run: sh /etc/uci-defaults/30_uboot-envtools Then do the steps for 'All' All: - run: fw_setenv flag_try_sys2_failed 1 - run: reboot The board will reboot into system 1 (stock basic kernel) and wait with system red light slowly blinking for a FAT formatted usb stick with a recovery image to be inserted. Press and hold the reset button for around 1 second. Status LED will turn yellow during recovery and blue when recovery complete. Signed-off-by: Kevin Darbyshire-Bryant <firstname.lastname@example.org>
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