esp-qcom-image: convert to OE-core uki.bbclass (#722)

This new class uses the OE-core uki.bbclass infrastructure to assemble an
ESP image with systemd-boot + UKI. It uses method #2 for config-less booting.

Systemd-boot is installed through package management, the UKI is picked
up from deploy. 

Signed-off-by: Koen Kooi
[koen.kooi@oss.qualcomm.com](mailto:koen.kooi@oss.qualcomm.com)
Fixes #707

Author: vkraleti

classes/uki-esp-image.bbclass

@@ -0,0 +1,19 @@
+# Create an ESP image that has a type #2 EFI UKI and systemd-boot
+#
+# Copyright (c) 2025 Qualcomm Innovation Center, Inc.
+#
+# SPDX-License-Identifier: MIT
+#
+
+# Optional subfolder, dependant on where the ESP partition gets mounted
+# intended to only have a leading slash, no trailing slash e.g. '/EFI', or just empty, ''
+ESPFOLDER ?= "/EFI"
+
+do_ukiesp() {
+	mkdir -p ${IMAGE_ROOTFS}${ESPFOLDER}/EFI/Linux
+
+	# Copy over files from deploy into the rootfs
+	install -m 0755 ${DEPLOY_DIR_IMAGE}/${UKI_FILENAME} ${IMAGE_ROOTFS}${ESPFOLDER}/EFI/Linux
+}
+
+addtask ukiesp after do_deploy uki before do_image_complete do_image_wic

recipes-kernel/images/esp-qcom-image.bb

@@ -1,14 +1,21 @@
 DESCRIPTION = "EFI System Partition Image to boot Qualcomm boards"
 
 PACKAGE_INSTALL = " \
-    linux-qcom-uki \
     systemd-boot \
 "
 
 KERNELDEPMODDEPEND = ""
 KERNEL_DEPLOY_DEPEND = ""
 
-inherit image
+ESPFOLDER = ""
+inherit image uki uki-esp-image
+
+UKI_FILENAME = "${EFI_LINUX_IMG}"
+
+UKI_CMDLINE = "root=${QCOM_BOOTIMG_ROOTFS} rw rootwait"
+
+# Remove 'upstream' dtb, rely on EFI provided one
+KERNEL_DEVICETREE = ""
 
 IMAGE_FSTYPES = "vfat"
 IMAGE_FSTYPES_DEBUGFS = ""