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mediatek: mt7622: add a second u-boot for redmi-ax6s

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The vendor u-boot knows nothing about UBI, and we used to have a
fixed-size kernel partition for vendor u-boot and UBI for rootfs.
However, that fixed partition becomes too small eventually, and
expanding it requires complicated procedure.

This commit changed the flash layout and added a second u-boot
where the kernel supposed to be.
Now the vendor u-boot chainloads our mainline u-boot, and our
u-boot reads kernel+rootfs from UBI, verifies it, and boot
into OpenWrt.

There are two possible ways to convert from the old fw:
Flash the factory image using mtd (provided by @rany2):

mount -o remount,ro /
mount -o remount,ro /overlay
cd /tmp
dd if=factory.bin bs=1M count=4 | mtd write - kernel
dd if=factory.bin bs=1M skip=4 | mtd -r write - ubi

Or, flash the 2nd u-boot via mtd and upload the firmware
to the 2nd u-boot using tftp:

1. prepare a tftp server at 192.168.1.254 to serve the
   sysupgrade image:
   openwrt-mediatek-mt7622-xiaomi_redmi-router-ax6s-squashfs-sysupgrade.itb
2. upload the ubi-loader.itb to OpenWrt /tmp, and flash it to
   the old kernel partition:
   mtd -r write openwrt-mediatek-mt7622-xiaomi_redmi-router-ax6s-ubi-loader.itb
3. The router should reboot and flash the sysupgrade image via TFTP.

Procedure for flashing from vendor firmware shouldn't change.

Signed-off-by: Chuanhong Guo <gch981213@gmail.com>
This commit is contained in:
Chuanhong Guo 2024-03-02 21:12:54 +08:00
parent ec8c3dc701
commit a6991fc7d2
4 changed files with 48 additions and 20 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

23
target/linux/mediatek/dts/mt7622-xiaomi-redmi-router-ax6s.dts
View File

@ -22,7 +22,8 @@
chosen {
stdout-path = "serial0:115200n8";
bootargs = "earlycon=uart8250,mmio32,0x11002000 console=ttyS0,115200n8 swiotlb=512";
rootdisk = <&ubi_rootfs>;
bootargs = "earlycon=uart8250,mmio32,0x11002000 swiotlb=512 ubi.block=0,fit root=/dev/fit0";
};
memory {
@ -230,7 +231,7 @@
mediatek,bmt-v2;
mediatek,bmt-table-size = <0x1000>;
mediatek,bmt-remap-range = <0x0 0x6c0000>;
mediatek,bmt-remap-range = <0x0 0x340000>;
partitions {
compatible = "fixed-partitions";
@ -295,12 +296,9 @@
read-only;
};
/* Shrunk and renamed from "firmware"
* as to not break luci size checks
*/
partition@2c0000 {
label = "kernel";
reg = <0x2c0000 0x400000>;
label = "ubi-loader";
reg = <0x2c0000 0x80000>;
};
/* ubi partition is the result of squashing
@ -310,9 +308,16 @@
* - overlay
* - obr
*/
partition@6c0000 {
partition@340000 {
label = "ubi";
reg = <0x6C0000 0x6f00000>;
reg = <0x340000 0x7280000>;
compatible = "linux,ubi";
volumes {
ubi_rootfs: ubi-volume-fit {
volname = "fit";
};
};
};
};
};

33
target/linux/mediatek/image/mt7622.mk
View File

@ -37,6 +37,21 @@ define Build/bl31-uboot
cat $(STAGING_DIR_IMAGE)/mt7622_$1-u-boot.fip >> $@
endef
define Build/uboot-bin
cat $(STAGING_DIR_IMAGE)/mt7622_$1-u-boot.bin >> $@
endef
define Build/uboot-fit
$(TOPDIR)/scripts/mkits.sh \
-D $(DEVICE_NAME) -o $@.its -k $@ \
-C $(word 1,$(1)) \
-a 0x41e00000 -e 0x41e00000 \
-c "config-1" \
-A $(LINUX_KARCH) -v u-boot
PATH=$(LINUX_DIR)/scripts/dtc:$(PATH) mkimage -f $@.its $@.new
@mv $@.new $@
endef
# Append header to a D-Link M32/R32 Kernel 1 partition
define Build/m32-r32-recovery-header-kernel1
$(eval header_start=$(word 1,$(1)))
@ -458,12 +473,20 @@ define Device/xiaomi_redmi-router-ax6s
BOARD_NAME := xiaomi,redmi-router-ax6s
DEVICE_PACKAGES := kmod-mt7915-firmware
UBINIZE_OPTS := -E 5
IMAGES += factory.bin
BLOCKSIZE := 128k
PAGESIZE := 2048
KERNEL_SIZE := 4096k
KERNEL := kernel-bin | gzip
KERNEL_INITRAMFS := kernel-bin | lzma | fit lzma $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb with-initrd | pad-to 64k
KERNEL_INITRAMFS_SUFFIX := -recovery.itb
IMAGE/factory.bin := append-kernel | pad-to $$(KERNEL_SIZE) | append-ubi
IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
IMAGES := sysupgrade.itb
IMAGE/sysupgrade.itb := append-kernel | fit gzip $$(KDIR)/image-$$(firstword $$(DEVICE_DTS)).dtb external-static-with-rootfs | append-metadata
ARTIFACTS := ubi-loader.itb
ARTIFACT/ubi-loader.itb := uboot-bin xiaomi_redmi-router-ax6s-ubi-loader | lzma | uboot-fit lzma
ifneq ($(CONFIG_TARGET_ROOTFS_SQUASHFS),)
ARTIFACTS += factory.bin
ARTIFACT/factory.bin := uboot-bin xiaomi_redmi-router-ax6s-ubi-loader | lzma | uboot-fit lzma | pad-to 512k | ubinize-image fit squashfs-sysupgrade.itb
endif
DEVICE_COMPAT_VERSION := 2.0
DEVICE_COMPAT_MESSAGE := Flash layout changes require a manual reinstall using factory.bin.
endef
# TARGET_DEVICES += xiaomi_redmi-router-ax6s
TARGET_DEVICES += xiaomi_redmi-router-ax6s

3
target/linux/mediatek/mt7622/base-files/etc/uci-defaults/05_fix-compat-version
View File

@ -9,7 +9,8 @@ case "$(board_name)" in
uci set system.@system[0].compat_version="1.1"
uci commit system
;;
linksys,e8450-ubi)
linksys,e8450-ubi|\
xiaomi,redmi-router-ax6s)
uci set system.@system[0].compat_version="2.0"
uci commit system
;;

9
target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
View File

@ -10,7 +10,8 @@ platform_do_upgrade() {
linksys,e8450-ubi|\
ubnt,unifi-6-lr-v1-ubootmod|\
ubnt,unifi-6-lr-v2-ubootmod|\
ubnt,unifi-6-lr-v3-ubootmod)
ubnt,unifi-6-lr-v3-ubootmod|\
xiaomi,redmi-router-ax6s)
[ -e /dev/fit0 ] && fitblk /dev/fit0
[ -e /dev/fitrw ] && fitblk /dev/fitrw
bootdev="$(fitblk_get_bootdev)"
@ -48,8 +49,7 @@ platform_do_upgrade() {
elecom,wrc-x3200gst3|\
mediatek,mt7622-rfb1-ubi|\
netgear,wax206|\
totolink,a8000ru|\
xiaomi,redmi-router-ax6s)
totolink,a8000ru)
nand_do_upgrade "$1"
;;
linksys,e8450)
@ -84,8 +84,7 @@ platform_check_image() {
elecom,wrc-x3200gst3|\
mediatek,mt7622-rfb1-ubi|\
netgear,wax206|\
totolink,a8000ru|\
xiaomi,redmi-router-ax6s)
totolink,a8000ru)
nand_do_platform_check "$board" "$1"
return $?
;;