mpc85xx: p1010: Use zImage loader for Watchguard Firebox T10

Since kernel 6.1, the Watchguard Firebox T10 can't boot anymore due to
increased kernel size.

This commit introduces the zImage loader from 7d768a9 to boot the kernel.
This is required, since the U-Boot version used in this device appears
to have a hard limit of 16MB for the kernel size it can handle. The
current kernel size is around 17MB, though, due to kernel page alignment
required for memory protection.

(cherry-picked from commit be7aa5bda40ee05b1dd0b4f4a1bf88e653ef875a)
Signed-off-by: Shine <4c.fce2@proton.me>
Link: https://github.com/openwrt/openwrt/pull/21130
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit 9123a0c358d0b5275fcd99c3001f47020d27425b)

target/linux/mpc85xx/image/p1010.mk

@@ -78,7 +78,12 @@ define Device/watchguard_firebox-t10
   DEVICE_VENDOR := Watchguard
   DEVICE_MODEL := Firebox T10
   DEVICE_PACKAGES := kmod-rtc-s35390a kmod-eeprom-at24
+  # This boot loader doesn't reliably boot an uncompressed image,
+  # therefore resort to gzipping the already compressed zImage
   KERNEL = kernel-bin | gzip | fit gzip $(KDIR)/image-$$(DEVICE_DTS).dtb
+  KERNEL_NAME := zImage.la3000000
+  KERNEL_ENTRY := 0x3000000
+  KERNEL_LOADADDR := 0x3000000
   IMAGES := sysupgrade.bin
   IMAGE/sysupgrade.bin := sysupgrade-tar | append-metadata
 endef

target/linux/mpc85xx/p1010/target.mk

@@ -1,5 +1,5 @@
 BOARDNAME:=P1010
-KERNEL_IMAGES:=simpleImage.br200-wp simpleImage.tl-wdr4900-v1 simpleImage.ws-ap3715i
+KERNEL_IMAGES:=simpleImage.br200-wp simpleImage.tl-wdr4900-v1 simpleImage.ws-ap3715i zImage.la3000000
 
 define Target/Description
 	Build firmware images for P1010 based boards.

target/linux/mpc85xx/patches-6.6/108-powerpc-85xx-firebox-t10-support.patch

@@ -1,6 +1,6 @@
 --- a/arch/powerpc/platforms/85xx/Kconfig
 +++ b/arch/powerpc/platforms/85xx/Kconfig
-@@ -83,6 +83,16 @@ config WS_AP3825I
+@@ -83,6 +83,17 @@ config WS_AP3825I
  	  This board is a Concurrent Dual-Band wireless access point with a
  	  Freescale P1020 SoC.
  
@@ -9,6 +9,7 @@
 +	select DEFAULT_UIMAGE
 +	select ARCH_REQUIRE_GPIOLIB
 +	select GPIO_MPC8XXX
++	select PPC_ZIMAGE_LA3000000
 +	help
 +	  This option enables support for the Watchguard Firebox T10 board.
 +	  This board is a VPN Gateway-Router with a

target/linux/mpc85xx/patches-6.6/111-powerpc-85xx-hpe-msm-support.patch

@@ -1,6 +1,6 @@
 --- a/arch/powerpc/platforms/85xx/Kconfig
 +++ b/arch/powerpc/platforms/85xx/Kconfig
-@@ -114,6 +114,18 @@ config FIREBOX_T10
+@@ -115,6 +115,18 @@ config FIREBOX_T10
  	  This board is a VPN Gateway-Router with a
  	  Freescale P1010 SoC.