This commit introduces OpenWrt U-Boot UBI layout support
for the COMFAST CF-WR632AX, enabling:
- Prolonged device lifetime by allocating most of the flash
to UBI (which takes care of wear-leveling)
- Maximum available storage space for OpenWrt
- Fully-featured U-Boot
- Effective recovery mechanisms
OpenWrt U-Boot UBI flash instructions
-------------------------------------
A device running stock firmware should be upgraded to the
latest standard OpenWrt firmware
(https://firmware-selector.openwrt.org/?target=mediatek%2Ffilogic&id=comfast_cf-wr632ax).
Back up critical data
---------------------
Console:
1. While the device is running OpenWrt with stock MTD partitions:
mtd dump BL2 > /tmp/BL2.bin
mtd dump u-boot-env > /tmp/u-boot-env.bin
mtd dump Factory > /tmp/Factory.bin
mtd dump FIP > /tmp/FIP.bin
2. Copy the backup files to your PC via SCP.
LuCI Web-UI:
"System" -> "Backup / Flash Firmware" -> "Save mtdblock contents"
Save mtdblock:
BL2
u-boot-env
Factory
FIP
Make sure the files were successfully downloaded to your downloads directory,
especially the Factory file.
Using the installer image
-------------------------
To simplify the installation process, this method uses a fork
of Daniel Golle's (@dangowrt) UBI Installer
https://github.com/dangowrt/owrt-ubi-installer
1. Ensure your router is running the latest generic OpenWrt firmware.
Upgrade it if necessary.
2. Obtain the installer image:
Build the installer from source
https://github.com/andros-ua/owrt-ubi-installer/tree/cf-wr632ax
or download a prebuilt image from the
https://github.com/andros-ua/owrt-ubi-installer/releases
3. Flash the openwrt*-ubi-initramfs-recovery-installer.itb
image using sysupgrade.
4. Wait for installation: the green status LED will blink rapidly,
indicating that the all-in-UBI installer is running.
5. Once the installation finishes,
the status LED will turn solid amber for 5 seconds.
6. After the device reboots, perform a final sysupgrade using the
openwrt*-ubi-squashfs-sysupgrade.itb image.
Return to stock MTD
-------------------
1. Flash openwrt*comfast_cf-wr632ax-initramfs-kernel.bin
via sysupgrade
2. Copy files to /tmp on the device via SCP:
BL2.bin
u-boot-env.bin
Factory.bin
FIP.bin
openwrt*-squashfs-sysupgrade.bin
3. Restore stock MTD partitions:
apk add kmod-mtd-rw
insmod mtd-rw i_want_a_brick=1
mtd write /tmp/BL2.bin BL2
mtd write /tmp/u-boot-env.bin u-boot-env
mtd write /tmp/Factory.bin Factory
mtd write /tmp/FIP.bin FIP
4. Install the system:
sysupgrade /tmp/*sysupgrade.bin
BL2 and FIP Recovery
--------------------
Use mtk_uartboot to recover corrupted BL2 or FIP via UART:
https://github.com/981213/mtk_uartboot
Stock layout
----------------------------------------
| dev: size erasesize name |
| mtd0: 00100000 00020000 "BL2" |
| mtd1: 00080000 00020000 "u-boot-env" |
| mtd2: 00200000 00020000 "Factory" |
| mtd3: 00200000 00020000 "FIP" |
| mtd4: 07000000 00020000 "ubi" |
----------------------------------------
OpenWrt U-Boot UBI layout
----------------------------------
| dev: size erasesize name |
| mtd0: 00100000 00020000 "bl2" |
| mtd1: 07f00000 00020000 "ubi" |
----------------------------------
Signed-off-by: Andrii Kuiukoff <andros.ua@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23981
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
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