Add recipe for balena bootloader

This is a separate version of the kernel that will be used as a second
stage bootloader instead of u-boot. With just this patch nothing will
use it yet but it will be ready for use when we start to switch.

Change-type: patch
Changelog-entry: Add recipe for balena bootloader
Signed-off-by: Michal Toman <michalt@balena.io>

layers/meta-balena-raspberrypi/recipes-kernel/linux/linux-balena-bootloader_6.1.bb

@@ -0,0 +1,50 @@
+LINUX_VERSION ?= "6.1.64"
+LINUX_RPI_BRANCH ?= "rpi-6.1.y"
+LINUX_RPI_KMETA_BRANCH ?= "yocto-6.1"
+
+SRCREV_machine = "dad5d57939cfae7af363e7c9862b59d33d96794b"
+SRCREV_meta = "f845a7f37d7114230d6609e2bd630070f2f6cd9b"
+
+KMETA = "kernel-meta"
+
+SRC_URI = " \
+          git://github.com/raspberrypi/linux.git;name=machine;branch=${LINUX_RPI_BRANCH};protocol=https \
+          git://git.yoctoproject.org/yocto-kernel-cache;type=kmeta;name=meta;branch=${LINUX_RPI_KMETA_BRANCH};destsuffix=${KMETA} \
+"
+SRC_URI:remove = "file://initramfs-image-bundle.cfg"
+SRC_URI:remove = "file://vc4graphics.cfg"
+
+require recipes-kernel/linux/linux-raspberrypi.inc
+
+inherit balena-bootloader
+
+BALENA_DEFCONFIG_NAME = "${KBUILD_DEFCONFIG}"
+
+BALENA_CONFIGS:append = " \
+    rpisense \
+    "
+
+BALENA_CONFIGS[rpisense] = " \
+    CONFIG_MFD_RPISENSE_CORE=n \
+    CONFIG_FB_RPISENSE=n \
+    "
+
+do_deploy:append () {
+    BOOTENV_FILE="${DEPLOYDIR}/${KERNEL_PACKAGE_NAME}/bootenv"
+    grub-editenv "${BOOTENV_FILE}" create
+    grub-editenv "${BOOTENV_FILE}" set "resin_root_part=A"
+    grub-editenv "${BOOTENV_FILE}" set "bootcount=0"
+    grub-editenv "${BOOTENV_FILE}" set "upgrade_available=0"
+}
+
+do_deploy[depends] += " grub-native:do_populate_sysroot"
+
+KERNEL_DTC_FLAGS += "-@ -H epapr"
+
+INITRAMFS_IMAGE = "balena-image-bootloader-initramfs"
+
+KERNEL_PACKAGE_NAME = "balena-bootloader"
+
+KERNEL_DEVICETREE = "${RPI_KERNEL_DEVICETREE}"
+
+PROVIDES = "virtual/balena-bootloader"