uboot: Add U-Boot bootloader support for Qualcomm platforms

Integrate U-Boot as an alternative bootloader to UEFI with conditional
selection via KAS configuration. Changes include:

- Add u-boot-qcom.yml KAS config for bootloader selection
- Add u-boot-qcom-next recipe sourcing uboot from Qualcomm Linux repo
  * Overrides default u-boot recipe from oe-core layer
  * Builds from git://github.com/qualcomm-linux/u-boot.git
  * Integrates qtestsign for signing (u-boot.elf → u-boot.mbn)
- Add qcom-partition-conf bbappend for automatic XML modification
- Conditionally replace uefi.elf with u-boot.mbn in partition XMLs

preferred bootloader can be switched between UEFI and U-Boot
by changing the KAS configuration file.

Signed-off-by: Aswin Murugan <aswin.murugan@oss.qualcomm.com>

Author: aswinm94

ci/u-boot-qcom.yml

@@ -0,0 +1,7 @@
+header:
+  version: 14
+
+local_conf_header:
+  bootloaderprovider: |
+    PREFERRED_PROVIDER_virtual/bootloader = "u-boot-qcom-next-upstream"
+    IMAGE_INSTALL:append = " u-boot-qcom-next-upstream"

conf/machine/qcs615-ride.conf

@@ -21,3 +21,5 @@ MACHINE_ESSENTIAL_EXTRA_RRECOMMENDS += " \
 QCOM_CDT_FILE = "cdt_adp_air_sa6155p"
 QCOM_BOOT_FILES_SUBDIR = "qcs615"
 QCOM_PARTITION_FILES_SUBDIR ?= "partitions/qcs615-ride/ufs"
+
+UBOOT_MACHINE = "qcom_qcs615_defconfig"

conf/machine/rb3gen2-core-kit.conf

@@ -30,3 +30,5 @@ QCOM_BOOT_FILES_SUBDIR = "qcm6490"
 QCOM_PARTITION_FILES_SUBDIR ?= "partitions/qcs6490-rb3gen2/ufs"
 
 QCOM_BOOT_FIRMWARE = "firmware-qcom-boot-qcs6490"
+
+UBOOT_MACHINE = "qcm6490_defconfig"

recipes-bsp/partition/qcom-partition-conf_git.bbappend

@@ -0,0 +1,27 @@
+# Modify partition configuration for U-Boot bootloader
+
+do_deploy:append() {
+    # Check if U-Boot is the bootloader
+    BOOTLOADER="${PREFERRED_PROVIDER_virtual/bootloader}"
+
+    if [ "$BOOTLOADER" = "u-boot-qcom-next" ] || [ "$BOOTLOADER" = "u-boot-qcom-next-upstream" ]; then
+        bbnote "U-Boot detected as bootloader, modifying partition XML files"
+
+        # Modify all rawprogram XML files in DEPLOYDIR (per-machine, safe)
+        for xml in ${DEPLOYDIR}/${QCOM_PARTITION_FILES_SUBDIR}/rawprogram*.xml; do
+            if [ -f "$xml" ]; then
+                sed -i 's/uefi\.elf/u-boot.mbn/g' "$xml"
+                bbnote "Modified $(basename $xml): uefi.elf -> u-boot.mbn"
+            fi
+        done
+
+        # Modify contents.xml file in DEPLOYDIR
+        if [ -f "${DEPLOYDIR}/${QCOM_PARTITION_FILES_SUBDIR}/contents.xml" ]; then
+            sed -i 's/<file_name>uefi\.elf<\/file_name>/<file_name>u-boot.mbn<\/file_name>/g' \
+                "${DEPLOYDIR}/${QCOM_PARTITION_FILES_SUBDIR}/contents.xml"
+            bbnote "Modified contents.xml: uefi.elf -> u-boot.mbn"
+        fi
+    else
+        bbnote "Using default UEFI bootloader (uefi.elf)"
+    fi
+}

recipes-bsp/u-boot/u-boot-qcom-next_git.bb

@@ -0,0 +1,70 @@
+SUMMARY = "U-Boot bootloader for Qualcomm platforms"
+DESCRIPTION = "U-Boot from Qualcomm Linux upstream repository"
+LICENSE = "GPL-2.0-or-later"
+LIC_FILES_CHKSUM = "file://Licenses/README;md5=2ca5f2c35c8cc335f0a19756634782f1"
+
+DEPENDS += "bison-native bc-native dtc-native gnutls-native python3-pyelftools-native xxd-native"
+DEPENDS += "python3-native python3-cryptography-native openssl-native"
+
+require recipes-bsp/u-boot/u-boot-common.inc
+require recipes-bsp/u-boot/u-boot.inc
+
+COMPATIBLE_MACHINE = "(qcom)"
+
+PV = "2026.01+git"
+
+# Pinned to specific commit from qcom-next branch
+SRCREV ?= "387b3e2f37a06337789531ffaaf3ac3e3c573ce2"
+
+SRCBRANCH ?= "nobranch=1"
+SRCBRANCH:class-devupstream ?= "branch=qcom-next"
+
+SRC_URI = " \
+    git://github.com/qualcomm-linux/u-boot.git;${SRCBRANCH};protocol=https;name=uboot \
+    git://github.com/msm8916-mainline/qtestsign;protocol=https;destsuffix=git/qtestsign;name=qtestsign;branch=main \
+"
+
+# Latest commit from qtestsign repo
+SRCREV_qtestsign = "${AUTOREV}"
+SRCREV_FORMAT = "uboot_qtestsign"
+
+# To build tip of qcom-next branch set preferred
+# virtual/bootloader provider to 'u-boot-qcom-next-upstream'
+BBCLASSEXTEND = "devupstream:target"
+PN:class-devupstream = "u-boot-qcom-next-upstream"
+SRCREV:class-devupstream ?= "${AUTOREV}"
+
+S = "${UNPACKDIR}/${BP}"
+
+# Provide virtual/bootloader
+PROVIDES += "virtual/bootloader"
+
+# Default config - can be overridden per machine
+UBOOT_MACHINE ?= "qcom_defconfig"
+
+# python3-cryptography needs the legacy provider, so set OPENSSL_MODULES to the
+# right path until this is relocated automatically.
+export OPENSSL_MODULES = "${STAGING_LIBDIR_NATIVE}/ossl-modules"
+
+do_compile:append() {
+    # Run the qtestsign script to sign and convert ELF to MBN
+    bbnote "Signing U-Boot ELF with qtestsign..."
+    ${PYTHON} ${UNPACKDIR}/git/qtestsign/qtestsign.py -v6 aboot -o ${B}/u-boot.mbn ${B}/u-boot.elf
+
+    # Check if u-boot.mbn was created successfully
+    if [ ! -f "${B}/u-boot.mbn" ]; then
+        bbfatal "Failed to create u-boot.mbn"
+    fi
+    bbnote "Successfully created u-boot.mbn"
+}
+
+do_deploy:append() {
+    # Deploy to standard DEPLOYDIR location
+    install -m 0644 ${B}/u-boot.mbn ${DEPLOYDIR}/u-boot.mbn
+
+    # Deploy to QCOM_BOOT_FILES_SUBDIR for qcomflash image
+    if [ -n "${QCOM_BOOT_FILES_SUBDIR}" ]; then
+        install -d ${DEPLOY_DIR_IMAGE}/${QCOM_BOOT_FILES_SUBDIR}
+        install -m 0644 ${B}/u-boot.mbn ${DEPLOY_DIR_IMAGE}/${QCOM_BOOT_FILES_SUBDIR}/u-boot.mbn
+    fi
+}