ath79: switch some RedBoot based devices to OKLI loader

After the kernel has switched version to 5.10, JA76PF2 and
RouterStations lost the capability to sysupgrade the OpenWrt version.
The cause is the lack of porting the patches responsible for partial
flash erase block writing and these boards FIS directory and RedBoot
config partitions share the same erase block. Because of that the FIS
directory can't be updated to accommodate kernel/rootfs partition size
changes. This could be remedied by bootloader update, but it is very
intrusive and could potentially lead to non-trivial recovery procedure,
if something went wrong. The less difficult option is to use OpenWrt
kernel loader, which will let us use static partition sizes and employ
mtd splitter to dynamically adjust kernel and rootfs partition sizes.
On sysupgrade from ath79 19.07 or 21.02 image, which still let to modify
FIS directory, the loader will be written to kernel partition, while the
kernel+rootfs to rootfs partition.

The caveats are:
* image format changes, no possible upgrade from ar71xx target images
* downgrade to any older OpenWrt version will require TFTP recovery or
  usage of bootloader command line interface

To downgrade to 19.07 or 21.02, or to upgrade if one is already on
OpenWrt with kernel 5.10, for RouterStations use TFTP recovery
procedure. For JA76PF2 use instructions from this commit message:
commit 0cc87b3bacee ("ath79: image: disable sysupgrade images for routerstations and ja76pf2"),
replacing kernel image with loader (loader.bin suffix) and rootfs
image with firmware (firmware.bin suffix).

Fixes: b10d6044599d ("kernel: add linux 5.10 support")
Fixes: 15aa53d7ee65 ("ath79: switch to Kernel 5.10")
Signed-off-by: Tomasz Maciej Nowak <tmn505@gmail.com>
(mkubntimage was moved to generic-ubnt.mk)
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>

1 files changed, 17 insertions, 8 deletions

diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 6af90c9903..96b073b1b5 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -1466,15 +1466,24 @@ define Device/jjplus_ja76pf2
   DEVICE_VENDOR := jjPlus
   DEVICE_MODEL := JA76PF2
   DEVICE_PACKAGES += -kmod-ath9k -swconfig -wpad-basic-wolfssl -uboot-envtools fconfig kmod-hwmon-lm75
-  IMAGES += kernel.bin rootfs.bin
-  IMAGE/kernel.bin := append-kernel
-  IMAGE/rootfs.bin := append-rootfs | pad-rootfs
-  IMAGE/sysupgrade.bin := append-rootfs | pad-rootfs | combined-image | \
-	check-size | append-metadata
-  KERNEL := kernel-bin | append-dtb | lzma | pad-to $$(BLOCKSIZE)
+  LOADER_TYPE := bin
+  LOADER_FLASH_OFFS := 0x60000
+  COMPILE := loader-$(1).bin
+  COMPILE/loader-$(1).bin := loader-okli-compile | lzma | pad-to 128k
+  ARTIFACTS := loader.bin
+  ARTIFACT/loader.bin := append-loader-okli $(1)
+  IMAGES += firmware.bin
+  IMAGE/firmware.bin := append-kernel | uImage lzma -M 0x4f4b4c49 | pad-to $$$$(BLOCKSIZE) | \
+	append-rootfs | pad-rootfs | pad-to $$$$(BLOCKSIZE) | check-size
+  IMAGE/sysupgrade.bin := $$(IMAGE/firmware.bin) | \
+	sysupgrade-tar kernel=$$$$(KDIR)/loader-$(1).bin rootfs=$$$$@ | append-metadata
+  KERNEL := kernel-bin | append-dtb | lzma
   KERNEL_INITRAMFS := kernel-bin | append-dtb
-  IMAGE_SIZE := 16000k
-  SUPPORTED_DEVICES += ja76pf2
+  IMAGE_SIZE := 15872k
+  DEVICE_COMPAT_VERSION := 2.0
+  DEVICE_COMPAT_MESSAGE := Partition design has changed compared to older versions (19.07 and 21.02) \
+	due to kernel drivers restrictions. Upgrade via sysupgrade mechanism is one way operation. \
+	Downgrading OpenWrt version will involve usage of bootloader command line interface.
 endef
 TARGET_DEVICES += jjplus_ja76pf2