[openwrt/openwrt] lantiq: ar7: use okli loader for FRITZ!Box

[LEDE Commits]

mkresin pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/9764968bbac00a1b8a99ef22f24f1a3c25e76f9d

commit 9764968bbac00a1b8a99ef22f24f1a3c25e76f9d
Author: Mathias Kresin <dev at kresin.me>
AuthorDate: Sun Nov 14 21:53:45 2021 +0100

    lantiq: ar7: use okli loader for FRITZ!Box
    
    With Kernel 5.10 the ar7 FRITZ!Box are not booting the initramfs nor the
    sysupgrade image any more. Presumably due to the grown kernel.
    
    Use the okli preloader to workaround the bootloader issue. No solution
    so far for the initramfs.
    
    Signed-off-by: Mathias Kresin <dev at kresin.me>
---
 .../mips/boot/dts/lantiq/ar9_avm_fritz7312.dts     |  4 +++
 .../mips/boot/dts/lantiq/ar9_avm_fritz7320.dts     |  4 +++
 target/linux/lantiq/image/Makefile                 | 35 +++++++++++++++++++++-
 target/linux/lantiq/image/ar9.mk                   |  6 ++--
 4 files changed, 46 insertions(+), 3 deletions(-)

diff --git a/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7312.dts b/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7312.dts
index 8d3d686f46..c8e67537a9 100644
--- a/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7312.dts
+++ b/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7312.dts
@@ -1,6 +1,7 @@
 #include "ar9.dtsi"
 
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/mtd/partitions/uimage.h>
 
 / {
 	compatible = "avm,fritz7312", "lantiq,xway", "lantiq,ar9";
@@ -131,7 +132,10 @@
 
 			partition at 20000 {
 				label = "firmware";
+				compatible = "openwrt,uimage", "denx,uimage";
 				reg = <0x20000 0xf60000>;
+				openwrt,ih-magic = <IH_MAGIC_OKLI>;
+				openwrt,offset = <0x11000>;
 			};
 
 			partition at f80000 {
diff --git a/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7320.dts b/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7320.dts
index f3b4e5e4f5..44b8a18dae 100644
--- a/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7320.dts
+++ b/target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_avm_fritz7320.dts
@@ -1,6 +1,7 @@
 #include "ar9.dtsi"
 
 #include <dt-bindings/input/input.h>
+#include <dt-bindings/mtd/partitions/uimage.h>
 
 / {
 	compatible = "avm,fritz7320", "lantiq,xway", "lantiq,ar9";
@@ -140,8 +141,11 @@
 			};
 
 			partition at 20000 {
+				compatible = "openwrt,uimage", "denx,uimage";
 				label = "firmware";
 				reg = <0x20000 0xf60000>;
+				openwrt,ih-magic = <IH_MAGIC_OKLI>;
+				openwrt,offset = <0x11000>;
 			};
 
 			partition at f80000 {
diff --git a/target/linux/lantiq/image/Makefile b/target/linux/lantiq/image/Makefile
index ec10cd882a..facc3fbe09 100644
--- a/target/linux/lantiq/image/Makefile
+++ b/target/linux/lantiq/image/Makefile
@@ -49,12 +49,35 @@ define Build/fullimage
 	rm $@.tmp
 endef
 
-DEVICE_VARS += SIGNATURE MAGIC CRC32_POLY
+define Build/loader-okli-compile
+	rm -rf $@.src
+	$(MAKE) -C lzma-loader \
+		PKG_BUILD_DIR="$@.src" \
+		TARGET_DIR="$(dir $@)" LOADER_NAME="$(notdir $@)" \
+		PLATFORM="lantiq" \
+		LZMA_TEXT_START=0x82000000 \
+		LOADADDR=0x80002000 \
+		FLASH_START=0x10000000 \
+		FLASH_OFFS=$(LOADER_FLASH_OFFS) \
+		FLASH_MAX=0x0 \
+		$(1) compile loader.bin
+	mv "$@.bin" "$@"
+	rm -rf $@.src
+endef
+
+define Build/prepend-loader-okli
+	cat "$(KDIR)/loader-$(word 1,$(1)).bin" "$@" >> "$@.new"
+	mv "$@.new" "$@"
+endef
+
+DEVICE_VARS += SIGNATURE MAGIC CRC32_POLY LOADER_FLASH_OFFS
+
 DTS_DIR := $(DTS_DIR)/lantiq
 
 # Shared device definition: applies to every defined device
 define Device/Default
   PROFILES = Default
+  COMPILE :=
   KERNEL_DEPENDS = $$(wildcard $(DTS_DIR)/$$(DEVICE_DTS).dts)
   KERNEL_INITRAMFS_NAME = $$(KERNEL_NAME)-initramfs
   KERNEL := kernel-bin | append-dtb | lzma | uImage lzma
@@ -105,6 +128,16 @@ define Device/AVM
 	append-rootfs | pad-rootfs | check-size | append-metadata
 endef
 
+define Device/AVM_preloader
+  DEVICE_VENDOR := AVM
+  COMPILE := loader-$(1).bin
+  COMPILE/loader-$(1).bin := loader-okli-compile | lzma | eva-image | \
+	pad-to 64k | append-avm-fakeroot | pad-to 4k
+  KERNEL := kernel-bin | append-dtb | lzma | uImage lzma -M 0x4f4b4c49 | \
+	prepend-loader-okli $(1)
+  KERNEL_INITRAMFS := kernel-bin | append-dtb | lzma | eva-image
+endef
+
 ifeq ($(SUBTARGET),ase)
 DEFAULT_SOC := amazonse
 include amazonse.mk
diff --git a/target/linux/lantiq/image/ar9.mk b/target/linux/lantiq/image/ar9.mk
index a68868f0d9..5a17395f82 100644
--- a/target/linux/lantiq/image/ar9.mk
+++ b/target/linux/lantiq/image/ar9.mk
@@ -1,8 +1,9 @@
 define Device/avm_fritz7312
-  $(Device/AVM)
+  $(Device/AVM_preloader)
   DEVICE_MODEL := FRITZ!Box 7312
   SOC := ar9
   IMAGE_SIZE := 15744k
+  LOADER_FLASH_OFFS := 0x31000
   DEVICE_PACKAGES := kmod-ath9k kmod-owl-loader wpad-basic-wolfssl \
 	kmod-ltq-adsl-ar9-mei kmod-ltq-adsl-ar9 \
 	kmod-ltq-adsl-ar9-fw-b kmod-ltq-atm-ar9 \
@@ -12,12 +13,13 @@ endef
 TARGET_DEVICES += avm_fritz7312
 
 define Device/avm_fritz7320
-  $(Device/AVM)
+  $(Device/AVM_preloader)
   DEVICE_MODEL := FRITZ!Box 7320
   DEVICE_ALT0_VENDOR := 1&1
   DEVICE_ALT0_MODEL := HomeServer
   SOC := ar9
   IMAGE_SIZE := 15744k
+  LOADER_FLASH_OFFS := 0x31000
   DEVICE_PACKAGES := kmod-ath9k kmod-owl-loader wpad-basic-wolfssl \
 	kmod-ltq-adsl-ar9-mei kmod-ltq-adsl-ar9 \
 	kmod-ltq-adsl-ar9-fw-b kmod-ltq-atm-ar9 \