configs/imx8mn-ddr4-evk_defconfig: new defconfig

Add a new defconfig for the imx8mn-ddr4-evk board that uses upstream
components, such as:

- Linux Kernel: Upstream version 6.12.16
- U-boot: Upstream version 2025.01
- ATF: Upstream version 2.12

Signed-off-by: Fabio Estevam <festevam@gmail.com>
Tested-by: Julien Olivain <ju.o@free.fr>
[Julien: Tested on board 700-31407 REV A5]
Signed-off-by: Julien Olivain <ju.o@free.fr>

board/freescale/imx8mn-evk/extlinux.conf.in

@@ -0,0 +1,4 @@
+label buildroot
+  kernel /boot/Image
+  devicetree /boot/freescale/imx8mn-ddr4-evk.dtb
+  append root=PARTUUID=%PARTUUID% rootwait rw

board/freescale/imx8mn-evk/genimage.cfg.in

@@ -0,0 +1,17 @@
+image sdcard.img {
+	hdimage {
+		partition-table-type = "gpt"
+	}
+
+	partition imx-boot {
+		in-partition-table = "no"
+		image = "flash.bin"
+		offset = 32K
+	}
+
+	partition rootfs {
+		offset = 8M
+		image = "rootfs.ext4"
+		partition-uuid = %PARTUUID%
+	}
+}

board/freescale/imx8mn-evk/patches/arm-trusted-firmware/arm-trusted-firmware.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  06b35a3596b8417bf66f7bfdd7acd181bcb53fc36dc13216227b5cae154e0219  arm-trusted-firmware-v2.12-git4.tar.gz

board/freescale/imx8mn-evk/patches/linux-headers/linux-headers.hash

@@ -0,0 +1 @@
+../linux/linux.hash

board/freescale/imx8mn-evk/patches/linux/linux.hash

@@ -0,0 +1,2 @@
+# From https://www.kernel.org/pub/linux/kernel/v6.x/sha256sums.asc
+sha256  5f81362a694f51520bff9faecb73f1cc9bc7bece6fdd10d5c27e348df39d7dc4  linux-6.12.16.tar.xz

board/freescale/imx8mn-evk/patches/uboot/uboot.hash

@@ -0,0 +1,2 @@
+# Locally calculated
+sha256  cdef7d507c93f1bbd9f015ea9bc21fa074268481405501945abc6f854d5b686f  u-boot-2025.01.tar.bz2

board/freescale/imx8mn-evk/post-build.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+BOARD_DIR="$(dirname "$0")"
+PARTUUID="$("$HOST_DIR"/bin/uuidgen)"
+
+install -d "$TARGET_DIR/boot/extlinux/"
+sed "s/%PARTUUID%/$PARTUUID/g" "$BOARD_DIR/extlinux.conf.in" > "$TARGET_DIR/boot/extlinux/extlinux.conf"
+sed "s/%PARTUUID%/$PARTUUID/g" "$BOARD_DIR/genimage.cfg.in" > "$BINARIES_DIR/genimage.cfg"

board/freescale/imx8mn-evk/readme.txt

@@ -0,0 +1,31 @@
+NXP i.MX8MN DDR4 EVK
+====================
+
+This is a Buildroot target for building an image for the imx8mn-ddr4-evk
+board using upstream components: TF-A, U-Boot and kernel.
+
+How to build it
+===============
+
+Configure Buildroot and build it:
+
+  $ make imx8mn-ddr4-evk_defconfig
+  $ make
+
+Flashing the SD card image
+==========================
+
+Copy the sdcard.img file into the SD card:
+
+  $ sudo dd if=output/images/sdcard.img of=<your-sd-device>; sync
+
+
+Booting the board
+=================
+
+To boot your newly created system:
+
+- Insert the SD card in the MicroSD slot of the board.
+- Connect a serial to USB cable to the DEBUG port.
+- Open a terminal on ttyUSB2 port. For example: sudo picocom -b 115200 /dev/ttyUSB1
+- Power on the board.

configs/imx8mn-ddr4-evk_defconfig

@@ -0,0 +1,48 @@
+BR2_aarch64=y
+BR2_ARM_FPU_VFPV3=y
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_6_12=y
+BR2_GLOBAL_PATCH_DIR="board/freescale/imx8mn-evk/patches"
+BR2_DOWNLOAD_FORCE_CHECK_HASHES=y
+BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttymxc1"
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/freescale/imx8mn-evk/post-build.sh"
+BR2_ROOTFS_POST_IMAGE_SCRIPT="support/scripts/genimage.sh"
+BR2_ROOTFS_POST_SCRIPT_ARGS="-c $(BINARIES_DIR)/genimage.cfg"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="6.12.16"
+BR2_LINUX_KERNEL_USE_ARCH_DEFAULT_CONFIG=y
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="freescale/imx8mn-ddr4-evk"
+BR2_LINUX_KERNEL_DTB_KEEP_DIRNAME=y
+BR2_LINUX_KERNEL_INSTALL_TARGET=y
+BR2_LINUX_KERNEL_NEEDS_HOST_OPENSSL=y
+BR2_PACKAGE_FREESCALE_IMX=y
+BR2_PACKAGE_FREESCALE_IMX_PLATFORM_IMX8MN=y
+BR2_PACKAGE_FIRMWARE_IMX=y
+BR2_PACKAGE_FIRMWARE_IMX_DDR4=y
+BR2_TARGET_ROOTFS_EXT2=y
+BR2_TARGET_ROOTFS_EXT2_4=y
+BR2_TARGET_ROOTFS_EXT2_SIZE="256M"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION=y
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_CUSTOM_VERSION_VALUE="v2.12"
+BR2_TARGET_ARM_TRUSTED_FIRMWARE_PLATFORM="imx8mn"
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION=y
+BR2_TARGET_UBOOT_CUSTOM_VERSION_VALUE="2025.01"
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="imx8mn_ddr4_evk"
+BR2_TARGET_UBOOT_NEEDS_DTC=y
+BR2_TARGET_UBOOT_NEEDS_PYLIBFDT=y
+BR2_TARGET_UBOOT_NEEDS_OPENSSL=y
+BR2_TARGET_UBOOT_NEEDS_GNUTLS=y
+BR2_TARGET_UBOOT_NEEDS_UTIL_LINUX=y
+BR2_TARGET_UBOOT_NEEDS_ATF_BL31=y
+BR2_TARGET_UBOOT_NEEDS_IMX_FIRMWARE=y
+BR2_TARGET_UBOOT_FORMAT_CUSTOM=y
+BR2_TARGET_UBOOT_FORMAT_CUSTOM_NAME="flash.bin"
+BR2_TARGET_UBOOT_SPL=y
+BR2_PACKAGE_HOST_GENIMAGE=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS=y
+BR2_PACKAGE_HOST_UBOOT_TOOLS_FIT_SUPPORT=y