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ar71xx: ubnt-m-xw: Fix factory image flashing using TFTP recovery

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This is backport of the same functionality in ath79, from commit
 d42a7c469 ("ath79: ubnt-m-xw: Fix factory image flashing using TFTP
             recovery method")

Ubiquity allows flashing of unsigned factory images via TFTP recovery
method[1]. They claim in airOS v6.0.7 release changelog[2] following:

 All future airOS versions will be signed in this way and not allow
 unsigned firmware to be loaded except via TFTP.

U-boot bootloader on M-XW devices expects factory image revision
version in specific format. On airOS v6.1.7 with `U-Boot 1.1.4-s1039
(May 24 2017 - 15:58:18)` bootloader checks if the revision major(?)
number is actually a number, but in currently generated images there's
OpenWrt text and so the check fails:

 Hit any key to stop autoboot:  0
 Setting default IP 192.168.1.20
 Starting TFTP server...
 Receiving file from 192.168.1.25:38438
 Received 4981148 bytes
 Firmware check failed! (1)

By placing arbitrary correct number first in major version, we make the
bootloader happy and we can flash factory images over TFTP again:

 Received 3801500 bytes
 Firmware Version: XW.ar934x.v6.0.4-42.OpenWrt-r9766+2-be42e44
 Setting U-Boot environment variables
 Un-Protected 1 sectors
 Erasing Flash.... done

Patch provided by AREDN[3] project, tested on Bullet M2 XW.

1. https://help.ubnt.com/hc/en-us/articles/204910124-UniFi-TFTP-Recovery-for-Bricked-Access-Points
2. https://dl.ubnt.com/firmwares/XW-fw/v6.0.7/changelog.txt
3. https://github.com/aredn

Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
Petr Štetiar 2018-11-19 21:44:50 +01:00
parent d23222a96c
commit 6009b3fd58
1 changed files with 11 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
target/linux/ar71xx/image/generic-ubnt.mk
View File

@ -1,4 +1,9 @@
DEVICE_VARS += UBNT_BOARD UBNT_CHIP UBNT_TYPE
DEVICE_VARS += UBNT_BOARD UBNT_CHIP UBNT_TYPE UBNT_VERSION UBNT_REVISION
# On M (XW) devices the U-Boot as of version 1.1.4-s1039 doesn't like
# VERSION_DIST being on the place of major(?) version number, so we need to
# use some number.
UBNT_REVISION := $(VERSION_DIST)-$(REVISION)
# mkubntimage is using the kernel image direct
# routerboard creates partitions out of the ubnt header
@ -17,7 +22,7 @@ define Build/mkubntimage-split
dd if=$@ of=$@.old1 bs=1024k count=1; \
dd if=$@ of=$@.old2 bs=1024k skip=1; \
$(STAGING_DIR_HOST)/bin/mkfwimage \
-B $(UBNT_BOARD) -v $(UBNT_TYPE).$(UBNT_CHIP).v6.0.0-$(VERSION_DIST)-$(REVISION) \
-B $(UBNT_BOARD) -v $(UBNT_TYPE).$(UBNT_CHIP).v$(UBNT_VERSION)-$(UBNT_REVISION) \
-k $@.old1 \
-r $@.old2 \
-o $@; \
@ -36,12 +41,14 @@ endef
# UBNT_BOARD e.g. one of (XS2, XS5, RS, XM)
# UBNT_TYPE e.g. one of (BZ, XM, XW)
# UBNT_CHIP e.g. one of (ar7240, ar933x, ar934x)
# UBNT_VERSION e.g. one of (6.0.0, 8.5.0)
define Device/ubnt
DEVICE_PACKAGES := kmod-usb-core kmod-usb2
DEVICE_PROFILE := UBNT
IMAGE_SIZE := 7552k
MTDPARTS := spi0.0:256k(u-boot)ro,64k(u-boot-env)ro,7552k(firmware),256k(cfg)ro,64k(EEPROM)ro
UBNT_BOARD := XM
UBNT_VERSION := 6.0.0
IMAGES := sysupgrade.bin factory.bin
IMAGE/sysupgrade.bin := append-kernel | pad-to $$$$(BLOCKSIZE) | append-rootfs | pad-rootfs | check-size $$$$(IMAGE_SIZE)
IMAGE/factory.bin := $$(IMAGE/sysupgrade.bin) | mkubntimage-split
@ -60,6 +67,8 @@ define Device/ubnt-xw
DEVICE_PACKAGES += rssileds
UBNT_TYPE := XW
UBNT_CHIP := ar934x
UBNT_VERSION := 6.0.4
UBNT_REVISION := 42.$(UBNT_REVISION)
endef
define Device/ubnt-bz