This supports build for the NXP imx8mm-lpddr4-evk reference platform.

imx8mm-lpddr4-evk.coffee

@@ -0,0 +1,51 @@
+deviceTypesCommon = require '@resin.io/device-types/common'
+{ networkOptions, commonImg, instructions } = deviceTypesCommon
+
+BOARD_POWEROFF = 'Remove and re-connect power to the board.'
+BOARD_SHUTDOWN =  'Monitor the device in Balena dashboard to see when it entered the post-provisioning state. Leave the state settle for around 10 seconds.'
+
+postProvisioningInstructions = [
+	BOARD_SHUTDOWN
+	instructions.REMOVE_INSTALL_MEDIA
+	instructions.BOARD_REPOWER
+]
+
+module.exports =
+	version: 1
+	slug: 'imx8mm-lpddr4-evk'
+	name: 'NXP i.MX8M Mini LPDDR4 EVK'
+	arch: 'aarch64'
+	state: 'development'
+
+	stateInstructions:
+		postProvisioning: postProvisioningInstructions
+
+	instructions: [
+		instructions.ETCHER_SD
+		instructions.EJECT_SD
+		instructions.FLASHER_WARNING
+		BOARD_POWEROFF
+	].concat(postProvisioningInstructions)
+
+	gettingStartedLink:
+		windows: 'https://docs.resin.io/imx8mm-lpddr4-evk/nodejs/getting-started/#adding-your-first-device'
+		osx: 'https://docs.resin.io/imx8mm-lpddr4-evk/nodejs/getting-started/#adding-your-first-device'
+		linux: 'https://docs.resin.io/imx8mm-lpddr4-evk/nodejs/getting-started/#adding-your-first-device'
+
+	yocto:
+		machine: 'imx8mm-lpddr4-evk'
+		image: 'balena-image-flasher'
+		fstype: 'balenaos-img'
+		version: 'yocto-honister'
+		deployArtifact: 'balena-image-flasher-imx8mm-lpddr4-evk.balenaos-img'
+		compressed: true
+
+	options: [ networkOptions.group ]
+
+	configuration:
+		config:
+			partition:
+				primary: 1
+			path: '/config.json'
+
+	initialization: commonImg.initialization

layers/meta-balena-fsl-arm/conf/layer.conf

@@ -18,6 +18,9 @@ PREFERRED_PROVIDER_virtual/bootloader:nitrogen6x = "u-boot-boundary"
 PREFERRED_PROVIDER_u-boot:nitrogen8mm = "u-boot-boundary"
 PREFERRED_PROVIDER_virtual/bootloader:nitrogen8mm = "u-boot-boundary"
 
+PREFERRED_PROVIDER_u-boot:imx8mm-lpddr4-evk = "u-boot-imx"
+PREFERRED_PROVIDER_virtual/bootloader:imx8mm-lpddr4-evk = "u-boot-imx"
+
 BBMASK += "meta-boundary/recipes-boundary/images"
 BBMASK += "meta-solidrun-arm-imx6/recipes-multimedia/gstreamer/gstreamer1.0-plugins-bad_1.12.%.bbappend"
 BBMASK += "meta-boundary/recipes-graphics/wayland/weston_4.0.0.imx.bbappend"
@@ -33,7 +36,12 @@ KERNEL_DEVICETREE:append:nitrogen8mm = " \
         freescale/imx8mm-nitrogen8mm_rev2-m4.dtb \
 "
 
+IMX_DEFAULT_BSP:imx8mm-lpddr4-evk = "nxp"
+
+SERIAL_CONSOLES:imx8mm-lpddr4-evk = "115200;ttymxc1"
+
 FIRMWARE_COMPRESSION:nitrogen8mm ?= "1"
+FIRMWARE_COMPRESSION:imx8mm-lpddr4-evk ?= "1"
 
 # Temporarily removed until the solidrun upstream repo adds honister support: https://github.com/SolidRun/meta-solidrun-solidsense/issues/2
 BBMASK += "meta-balena-fsl-arm/recipes-bsp/u-boot/u-boot-solidsense-imx6_%.bbappend"

layers/meta-balena-fsl-arm/recipes-bsp/u-boot/files/0002-fixup-imx8mm-evk-fdt-addr.patch

@@ -0,0 +1,14 @@
+diff -ur git.org/include/configs/imx8mm_evk.h git/include/configs/imx8mm_evk.h
+--- git.org/include/configs/imx8mm_evk.h	2023-09-19 17:04:45.921296582 +0100
++++ git/include/configs/imx8mm_evk.h	2023-09-19 17:06:34.504395138 +0100
+@@ -138,8 +138,8 @@
+ 	"image=Image\0" \
+ 	"splashimage=0x50000000\0" \
+ 	"console=ttymxc1,115200\0" \
+-	"fdt_addr_r=0x43000000\0"			\
+-	"fdt_addr=0x43000000\0"			\
++	"fdt_addr_r=0x44000000\0"			\
++	"fdt_addr=0x44000000\0"			\
+ 	"fdt_high=0xffffffffffffffff\0"		\
+ 	"boot_fit=no\0" \
+ 	"fdtfile=" CONFIG_DEFAULT_FDT_FILE "\0" \

layers/meta-balena-fsl-arm/recipes-bsp/u-boot/files/balenaos_tweaks-imx.cfg

@@ -0,0 +1,3 @@
+CONFIG_ENV_SIZE=0x4000
+CONFIG_ENV_IS_NOWHERE=y
+CONFIG_CMD_SAVEENV=n

layers/meta-balena-fsl-arm/recipes-bsp/u-boot/files/increase-early-malloc.cfg

@@ -0,0 +1 @@
+CONFIG_SYS_MALLOC_F_LEN=0x10000

layers/meta-balena-fsl-arm/recipes-bsp/u-boot/u-boot-imx_%.bbappend

@@ -0,0 +1,12 @@
+UBOOT_KCONFIG_SUPPORT="1"
+BALENA_UBOOT_DEVICE_TYPES="mmc"
+inherit resin-u-boot
+
+FILESEXTRAPATHS:prepend := "${THISDIR}/files:"
+
+SRC_URI:append:imx8mm-lpddr4-evk = " \
+    file://0001-nitrogen8mm_env-common-Force-using-default-environment.patch \
+    file://0002-fixup-imx8mm-evk-fdt-addr.patch \
+    file://balenaos_tweaks-imx.cfg \
+    file://increase-early-malloc.cfg \
+"

layers/meta-balena-fsl-arm/recipes-connectivity/networkmanager/networkmanager_%.bbappend

@@ -6,3 +6,12 @@ unmanaged-devices=interface-name:p2p*
 EOF
 
 }
+
+do_deploy:append:imx8mm-lpddr4-evk() {
+     cat >> ${D}${sysconfdir}/NetworkManager/NetworkManager.conf <<EOF
+
+[keyfile]
+unmanaged-devices=interface-name:p2p*
+EOF
+
+}

layers/meta-balena-fsl-arm/recipes-core/images/balena-image-initramfs.bbappend

@@ -3,4 +3,5 @@ PACKAGE_INSTALL:solidrun-n6g += " \
 "
 
 PACKAGE_INSTALL:remove:nitrogen8mm = " initramfs-module-recovery"
+
 PACKAGE_INSTALL:remove = "mdraid"

layers/meta-balena-fsl-arm/recipes-core/images/balena-image.inc

@@ -111,6 +111,20 @@ BALENA_BOOT_PARTITION_FILES:nitrogen8mm-dwe = " \
     imx-boot:/imx-boot \
 "
 
+BALENA_BOOT_SIZE:imx8mm-lpddr4-evk = "131072"
+IMAGE_ROOTFS_SIZE:imx8mm-lpddr4-evk = "524288"
+IMAGE_FSTYPES:append:imx8mm-lpddr4-evk = " balenaos-img"
+BALENA_IMAGE_BOOTLOADER:imx8mm-lpddr4-evk = "u-boot-imx"
+BALENA_BOOT_PARTITION_FILES:imx8mm-lpddr4-evk = " \
+    ${KERNEL_IMAGETYPE}${KERNEL_INITRAMFS}-${MACHINE}.bin:/${KERNEL_IMAGETYPE} \
+    imx8mm-evk.dtb:/imx8mm-evk.dtb \
+    imx-boot:/imx-boot \
+"
+
+IMAGE_CMD:balenaos-img:append:imx8mm-lpddr4-evk () {
+    dd if=${DEPLOY_DIR_IMAGE}/imx-boot of=${BALENA_RAW_IMG} conv=notrunc seek=33 bs=1024
+}
+
 # up the rootfs size to be safe for future increases
 IMAGE_ROOTFS_SIZE:emgw3="409600"
 
@@ -134,7 +148,16 @@ IMAGE_INSTALL:append:emgw3 = " \
 	udev-rules-bt \
 "
 
+IMAGE_INSTALL:append:imx8mm-lpddr4-evk = " \
+       firmware-imx-8m \
+       linux-firmware-bdsdmac \
+       linux-firmware-iwlwifi \
+       kernel-devicetree \
+       pciutils \
+"
+
 DEPENDS:append:nitrogen8mm += "imx-boot"
+DEPENDS:append:imx8mm-lpddr4-evk += "imx-boot"
 
 # the BSP sets this variable so let's unset it since this makes our build fail
 unset ROOTFS_SIZE

layers/meta-balena-fsl-arm/recipes-kernel/linux/linux-fslc-imx/0001-disable-audio-codecs.patch

@@ -0,0 +1,43 @@
+diff -ur kernel-source.org/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi kernel-source/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
+--- kernel-source.org/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi	2023-09-20 14:08:41.822947549 +0100
++++ kernel-source/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi	2023-09-20 16:08:00.194748554 +0100
+@@ -130,6 +130,7 @@
+ 		audio-cpu = <&sai1>;
+ 		audio-codec = <&ak4458_1>, <&ak4458_2>;
+ 		reset-gpios = <&pca6416 4 GPIO_ACTIVE_LOW>;
++		status = "disabled";
+ 	};
+
+ 	sound-ak5558 {
+@@ -409,6 +410,7 @@
+ 		reg = <0x10>;
+ 		AVDD-supply = <&reg_audio_board>;
+ 		DVDD-supply = <&reg_audio_board>;
++		status = "disabled";
+ 	};
+
+ 	ak4458_2: ak4458@12 {
+@@ -416,6 +418,7 @@
+ 		reg = <0x12>;
+ 		AVDD-supply = <&reg_audio_board>;
+ 		DVDD-supply = <&reg_audio_board>;
++		status = "disabled";
+ 	};
+
+ 	ak5558: ak5558@13 {
+@@ -424,6 +427,7 @@
+ 		reset-gpios = <&pca6416 3 GPIO_ACTIVE_LOW>;
+ 		AVDD-supply = <&reg_audio_board>;
+ 		DVDD-supply = <&reg_audio_board>;
++		status = "disabled";
+ 	};
+
+ 	ak4497: ak4497@11 {
+@@ -433,6 +437,7 @@
+ 		AVDD-supply = <&reg_audio_board>;
+ 		DVDD-supply = <&reg_audio_board>;
+ 		dsd-path = <1>;
++		status = "disabled";
+ 	};
+
+ 	ov5640_mipi: ov5640_mipi@3c {

layers/meta-balena-fsl-arm/recipes-kernel/linux/linux-fslc-imx/0002-disable-caam-jr2.patch

@@ -0,0 +1,11 @@
+diff -ur kernel-source.org/arch/arm64/boot/dts/freescale/imx8mm.dtsi kernel-source/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+--- kernel-source.org/arch/arm64/boot/dts/freescale/imx8mm.dtsi	2023-09-20 18:56:03.116395438 +0100
++++ kernel-source/arch/arm64/boot/dts/freescale/imx8mm.dtsi	2023-09-20 19:00:09.565594489 +0100
+@@ -941,6 +941,7 @@
+ 					compatible = "fsl,sec-v4.0-job-ring";
+ 					reg = <0x3000 0x1000>;
+ 					interrupts = <GIC_SPI 114 IRQ_TYPE_LEVEL_HIGH>;
++                                        status = "disabled";
+ 				};
+ 			};
+

layers/meta-balena-fsl-arm/recipes-kernel/linux/linux-fslc-imx/enable-iwlwifi.cfg

@@ -0,0 +1,13 @@
+CONFIG_IWLWIFI=y
+CONFIG_IWLWIFI_LEDS=y
+CONFIG_IWLDVM=y
+CONFIG_IWLMVM=y
+# CONFIG_IWLWIFI_BCAST_FILTERING is not set
+
+#
+# Debugging Options
+#
+# CONFIG_IWLWIFI_DEBUG is not set
+# end of Debugging Options
+
+# CONFIG_MXC_GPU_VIV is not set

layers/meta-balena-fsl-arm/recipes-kernel/linux/linux-fslc-imx/extra-kernel.cfg

@@ -0,0 +1 @@
+CONFIG_NETFILTER_XT_MATCH_PKTTYPE=m

layers/meta-balena-fsl-arm/recipes-kernel/linux/linux-fslc-imx_%.bbappend

@@ -0,0 +1,14 @@
+FILESEXTRAPATHS:append := ":${THISDIR}/${PN}"
+
+inherit kernel-balena
+
+# Disable commit SHA in kernel version string
+SCMVERSION:imx8mm-lpddr4-evk ="n"
+
+SRC_URI:append:imx8mm-lpddr4-evk = " \
+	file://0001-disable-audio-codecs.patch \
+        file://0002-disable-caam-jr2.patch \
+        file://enable-iwlwifi.cfg \
+        file://extra-kernel.cfg \
+"
+

layers/meta-balena-fsl-arm/recipes-support/balena-info/balena-info.bbappend

@@ -1 +1,2 @@
 TTYS:append:nitrogen8mm = " ttymxc1"
+TTYS:append:imx8mm-lpddr4-evk = " ttymxc1"

layers/meta-balena-fsl-arm/recipes-support/hostapp-update-hooks/files/99-flash-bootloader-imx8mm-lpddr4-evk

@@ -0,0 +1,38 @@
+#!/bin/sh
+
+#
+# Script used by hostapps updater to flash bootloader onto internal media
+#
+
+set -o errexit
+
+# machine specific data
+uboot_file="imx-boot"
+uboot_block_size=1024
+uboot_seek_blocks=33
+device="/dev/mmcblk2boot0"
+
+update_files="uboot"
+
+for i in $update_files; do
+	current_update_file=$(eval echo \$${i}_file)
+	block_size=$(eval echo \$${i}_block_size)
+	seek_blocks=$(eval echo \$${i}_seek_blocks)
+
+	# calculate size and md5sum of the binary to update from the update bundle
+	update_size=$(ls -al /resin-boot/$current_update_file | awk '{print $5}')
+	update_md5sum=$(md5sum /resin-boot/$current_update_file | awk '{print $1'})
+
+	let skip_bytes=$block_size*$seek_blocks
+
+	# calculate md5sum of the data already written to $device, using $update_size bytes and skipping $skip_bytes from $device
+	existing_md5sum=$(dd if=$device bs=1 skip=$skip_bytes count=$update_size status=none | md5sum | awk '{print $1}')
+
+	# This hw partition should NOT be erased on imx8mm-lpddr4-evk, as it might contain an u-boot eMMC environment
+	if [ ! "$existing_md5sum" = "$update_md5sum" ]; then
+		echo "Will update u-boot on /dev/mmcblk2boot0"
+		echo 0 > /sys/block/mmcblk2boot0/force_ro
+		dd if=/resin-boot/$current_update_file of=$device conv=fdatasync seek=$seek_blocks bs=$block_size
+		echo 1 > /sys/block/mmcblk2boot0/force_ro
+	fi
+done

layers/meta-balena-fsl-arm/recipes-support/hostapp-update-hooks/hostapp-update-hooks.bbappend

@@ -19,3 +19,8 @@ HOSTAPP_HOOKS:append:nitrogen8mm = " \
     99-resin-uboot \
     99-flash-bootloader-nitrogen8mm \
 "
+
+HOSTAPP_HOOKS:append:imx8mm-lpddr4-evk = " \
+    99-resin-uboot \
+    99-flash-bootloader-imx8mm-lpddr4-evk \
+"

layers/meta-balena-fsl-arm/recipes-support/resin-init/resin-init-flasher-board-imx8mm/resin-init-flasher-board

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+#
+# Initial flashing of u-boot
+#
+
+set -o errexit
+
+# machine specific data
+uboot_file="imx-boot"
+uboot_block_size=1024
+uboot_seek_blocks=33
+uboot_device="/dev/mmcblk2boot0"
+
+# This hw partition should never be erased on the iMX8MM
+# as it might contain an eMMC u-boot environment
+echo 0 > /sys/block/mmcblk2boot0/force_ro
+dd if=/mnt/boot/$uboot_file of=$uboot_device conv=fdatasync seek=$uboot_seek_blocks bs=$uboot_block_size
+echo 1 > /sys/block/mmcblk2boot0/force_ro

layers/meta-balena-fsl-arm/recipes-support/resin-init/resin-init-flasher-board.bbappend

@@ -1 +1,2 @@
-FILESEXTRAPATHS:append := "${THISDIR}/${PN}"
+FILESEXTRAPATHS:append:nitrogen8mm := "${THISDIR}/${PN}-nitrogen8mm"
+FILESEXTRAPATHS:append:imx8mm-lpddr4-evk := "${THISDIR}/${PN}-imx8mm"

layers/meta-balena-fsl-arm/recipes-support/resin-init/resin-init-flasher.bbappend

@@ -1,3 +1,4 @@
 # Flash to internal eMMC - kernel always enumerates emmc as mmcblk2
 INTERNAL_DEVICE_KERNEL:solidrun-imx6 = "mmcblk2"
 INTERNAL_DEVICE_KERNEL:nitrogen8mm = "mmcblk0"
+INTERNAL_DEVICE_KERNEL:imx8mm-lpddr4-evk = "mmcblk2"