[FS#3960] Xiaomi MiWifi Nano 3C/ R3C/ R3L dts mismatch causes the device not to boot

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - vamanea (vamanea) 

Attached to Project - OpenWrt/LEDE Project
Summary - Xiaomi MiWifi Nano 3C/ R3C/ R3L dts mismatch causes the device not to boot
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - openwrt-19.07
Due in Version - Undecided
Due Date - Undecided
Details - Supply the following if possible:
 - Device problem occurs on
Xiaomi MiWifi R3L
 - Software versions of OpenWrt/LEDE release, packages, etc.
OpenWrt v19.07.7
 - Steps to reproduce
1) From the Wiki at https://openwrt.org/toh/xiaomi/mir3c flash the sysupgrade image: http://downloads.openwrt.org/releases/19.07.7/targets/ramips/mt76x8/openwrt-19.07.7-ramips-mt76x8-miwifi-nano-squashfs-sysupgrade.bin
2) Device does not boot anymore

The problem is the dts MIWIFI-NANO.dts defines a incompatible layout of the flash, which ends up flashing OpenWrt to the wrong part of the flash.
The OEM partition layout is:

[    1.510000] 0x000000000000-0x000001000000 : "ALL"
[    1.510000] 0x000000000000-0x000000030000 : "Bootloader"
[    1.520000] 0x000000030000-0x000000040000 : "Config"
[    1.530000] 0x000000040000-0x000000050000 : "Bdata"
[    1.530000] 0x000000050000-0x000000060000 : "Factory"
[    1.540000] 0x000000060000-0x000000070000 : "crash"
[    1.550000] 0x000000070000-0x000000080000 : "cfg_bak"
[    1.550000] 0x000000080000-0x000000140000 : "overlay"
[    1.560000] 0x000000140000-0x0000008a0000 : "OS1"
[    1.610000] 0x0000002a0000-0x0000008a0000 : "rootfs"
[    1.610000] 0x0000008a0000-0x000001000000 : "OS2"


with emphasis on OS1 and OS2.

However MIWIFI-NANO.dts defines firmware partition as:

                        partition at 50000 {
                                compatible = "denx,uimage";
                                label = "firmware";
                                reg = ;

                        };
 

The bootloader will boot either OS1 or OS2 -> we get an unbootable device.

Now we have two similar devices, MiWifi Nano R1 and R3L/R3C with different partition layout but the wiki proposes to flash the same image: https://openwrt.org/toh/xiaomi/mir3c https://openwrt.org/toh/xiaomi/miwifi_nano I personally still use my R3L so I would propose we add a new device type that could cover R3L. 

 

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3960

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