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

More work is needed:
- add Balena website details for this board at given links
- "contracts" have not been looked at
- writing to /dev/ttymxc0 seems to reset the board
- need to check support for secure boot / secure filesystem
- need to support image flasher
- testing

Changelog-entry: Add support for NXP imx8mm-lpddr4-evk board
Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

Remove extraneous patch

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

Default to balenaOS image flasher

We have made changes to correctly enable build of the
flasher image which has been tested to run up and flash
the onboard EVK eMMC part correctly. This then boots
and runs up to the BalenaOS prompt

TODO:

- Still need to verify portal HostOS update works
  but will do that when device is supported through
  portal

Changelog-entry: Default imx8mm-lpddr4-evk board to image-flasher
Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

Use correct Yocto MACHINE name imx8mm-lpddr4-evk

I was overriding this to append -nxp to enable use of
IMX_DEFAULT_BSP="nxp" but am now adding this in layer.conf
instead so we can use the original machine name

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

iwlwifi: Add support for Intel iwlwifi devices

We're using an M.2 WiFi module AX210NGW which this change supports

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

linux-fslc-imx: Changes for peer review

- inherit kernel-balena not kernel-resin
- tidy up comments
- make settings board specific for disabling kernel versioning
  and kernel patches
- don't disable apparmour as this done elsewhere
- don't optimise for size as we set f/s size for EVK board

Signed-off-by: Alex J Lennon <ajlennon@dynamicdevices.co.uk>

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 +3,6 @@ PACKAGE_INSTALL:solidrun-n6g += " \
 "
 
 PACKAGE_INSTALL:remove:nitrogen8mm = " initramfs-module-recovery"
+PACKAGE_INSTALL:remove:imx8mm-lpddr4-evk = " 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_%.bbappend

@@ -0,0 +1,13 @@
+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 \
+"
+

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"