configs/imxrt1050-evk: bump U-Boot and switch to use extlinux.conf

Switch to extlinux instead of built in U-Boot script.
Drop custom U-Boot fragment and genimage config.
Update U-Boot from 2024.01 to 2025.07. This new U-Boot now
requires BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y in the defconfig.

Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
[Julien:
 - mention U-Boot bump in commit log
 - add BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
]
Signed-off-by: Julien Olivain <ju.o@free.fr>

board/freescale/imxrt1050evk/genimage.cfg

@@ -1,14 +1,3 @@
-image boot.vfat {
-	vfat {
-		files = {
-			"zImage",
-			"imxrt1050-evk.dtb",
-		}
-	}
-
-	size = 8M
-}
-
 image sdcard.img {
 	hdimage {
 	}
@@ -27,12 +16,6 @@ image sdcard.img {
 		size = 512K
 	}
 
-	partition boot {
-		partition-type = 0xc
-		bootable = "true"
-		image = "boot.vfat"
-	}
-
 	partition rootfs {
 		partition-type = 0x83
 		image = "rootfs.ext4"

board/freescale/imxrt1050evk/rootfs_overlay/boot/extlinux/extlinux.conf

@@ -0,0 +1,4 @@
+label buildroot
+	kernel /boot/zImage
+	devicetree /boot/imxrt1050-evk.dtb
+	append console=ttyLP0 root=/dev/mmcblk0p1 rootwait rw

board/freescale/imxrt1050evk/uboot.fragment

@@ -1,2 +0,0 @@
-CONFIG_USE_BOOTCOMMAND=y
-CONFIG_BOOTCOMMAND="setenv bootargs console=ttyLP0 root=/dev/mmcblk0p2 rw earlycon rootwait;load mmc 0:1 0x80800000 imxrt1050-evk.dtb;load mmc 0:1 0x80000000 zImage;bootz 0x80000000 - 0x80800000"

configs/imxrt1050-evk_defconfig

@@ -1,6 +1,7 @@
 BR2_arm=y
 BR2_cortex_m7=y
 BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_7=y
+BR2_ROOTFS_OVERLAY="board/freescale/imxrt1050evk/rootfs_overlay"
 BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
 BR2_ROOTFS_POST_SCRIPT_ARGS="-c board/freescale/imxrt1050evk/genimage.cfg"
 BR2_LINUX_KERNEL=y
@@ -9,15 +10,16 @@ BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.7"
 BR2_LINUX_KERNEL_DEFCONFIG="imxrt"
 BR2_LINUX_KERNEL_DTS_SUPPORT=y
 BR2_LINUX_KERNEL_INTREE_DTS_NAME="nxp/imx/imxrt1050-evk"
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
 BR2_TARGET_ROOTFS_EXT2=y
 BR2_TARGET_ROOTFS_EXT2_4=y
 BR2_TARGET_ROOTFS_EXT2_SIZE="16M"
 BR2_TARGET_UBOOT=y
 BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
 BR2_TARGET_UBOOT_CUSTOM_VERSION=y
-BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2024.01"
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2025.07"
 BR2_TARGET_UBOOT_BOARD_DEFCONFIG="imxrt1050-evk"
-BR2_TARGET_UBOOT_CONFIG_FRAGMENT_FILES="board/freescale/imxrt1050evk/uboot.fragment"
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
 BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
 BR2_TARGET_UBOOT_FORMAT_IMG=y
 BR2_TARGET_UBOOT_SPL=y