diff --git a/recipes-kernel/qcom-rtss-mailbox-kmd/qcom-rtss-mailbox-kmd_1.0.0.bb b/recipes-kernel/qcom-rtss-mailbox-kmd/qcom-rtss-mailbox-kmd_1.0.0.bb
new file mode 100644
index 000000000..ac3680e89
--- /dev/null
+++ b/recipes-kernel/qcom-rtss-mailbox-kmd/qcom-rtss-mailbox-kmd_1.0.0.bb
@@ -0,0 +1,35 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+SUMMARY = "QCOM RTSS Mailbox Kernel Driver Module"
+DESCRIPTION = "Dynamically Loadable Kernel Module (DLKM) for RTSS mailbox communication. \
+Provides mailbox IPC communication between APSS and RTSS."
+LICENSE = "GPL-2.0-only"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/${LICENSE};md5=801f80980d171dd6425610833a22dbe6"
+
+PV = "1.0.0"
+
+SRC_URI = "git://github.com/qualcomm-linux/rtss-mailbox-kmd.git;branch=rtss-mailbox-kernel.le.0.0;protocol=https;tag=v${PV}"
+SRCREV  = "74f4ec17e45a65e455c2bff33638b5c5a7c507e0"
+
+inherit module
+
+RPROVIDES:${PN} += "kernel-module-rtss-mailbox"
+
+EXTRA_OEMAKE += "MACHINE='${MACHINE}'"
+MAKE_TARGETS = "modules"
+MODULES_INSTALL_TARGET = "modules_install"
+
+# qcom-ipcc (CONFIG_QCOM_IPCC=y) is built into the kernel image, not a DLKM,
+# so no RDEPENDS on a qcom-ipcc package is needed.
+# The softdep below documents the runtime dependency and ensures modprobe
+# loads rtss_mailbox only after the MAILBOX framework is ready.
+KERNEL_MODULE_PROBECONF += "rtss_mailbox"
+module_conf_rtss_mailbox = "softdep rtss_mailbox pre: qcom_ipcc"
+
+# Install the UAPI header into the sysroot so the UMD build can consume it.
+# DEPENDS = "qcom-rtss-mailbox-kmd" in qcom-rtss-mailbox-umd.bb pulls this in first.
+do_install:append() {
+    install -d ${D}${includedir}
+    install -m 0644 ${S}/include/uapi/rtss_mailbox_uapi.h ${D}${includedir}/
+}
+
diff --git a/recipes-support/qcom-rtss-mailbox-umd/qcom-rtss-mailbox-umd_1.0.0.bb b/recipes-support/qcom-rtss-mailbox-umd/qcom-rtss-mailbox-umd_1.0.0.bb
new file mode 100644
index 000000000..aafb8257f
--- /dev/null
+++ b/recipes-support/qcom-rtss-mailbox-umd/qcom-rtss-mailbox-umd_1.0.0.bb
@@ -0,0 +1,118 @@
+# SPDX-License-Identifier: BSD-3-Clause
+
+SUMMARY = "Qualcomm RTSS mailbox userspace middleware"
+DESCRIPTION = "Userspace middleware libraries and utilities for RTSS mailbox \
+IPC communication between APSS and RTSS. Provides librtss_mailbox, \
+librtss_safemlib, and the librtss_ota OTA SDK library."
+LICENSE = "BSD-3-Clause"
+LIC_FILES_CHKSUM = "file://${COMMON_LICENSE_DIR}/BSD-3-Clause;md5=550794465ba0ec5312d6919e203a55f9"
+
+# ---------------------------------------------------------------------------
+# Version tracks
+#
+# Track 1 — Mailbox middleware  (librtss_mailbox + librtss_safemlib)
+#   Tied to RTSS_MB_UAPI_VERSION_MAJOR in rtss_mailbox_uapi.h.
+#   Bump SOVERSION when KMD IOCTL struct or numbers change.
+#   Bump minor for UMD-only additive API changes.
+#   Bump patch for bug fixes with no API/ABI change.
+#   Bump PR (r0->r1) for recipe/packaging fix with no source change.
+#
+# Track 2 — OTA SDK  (librtss_ota)
+#   Tied to RTSS_UPD_VER_MAJ/MIN in rtss_ota_lib.h.
+#   Changes independently and more frequently than middleware.
+#   Version carried by SONAME (librtss_ota.so.1) and package name (qcom-rtss-ota).
+# ---------------------------------------------------------------------------
+PV = "1.0.0"
+PR = "r0"
+
+# qcom-rtss-ota sub-packages carry OTA version independently of middleware PV.
+PKGV:qcom-rtss-ota           = "${PV}"
+PKGV:qcom-rtss-ota-staticdev = "${PV}"
+PKGV:qcom-rtss-ota-dev       = "${PV}"
+
+# Suppress Debian auto-renaming for single-soname OTA sub-packages.
+# qcom-rtss-ota installs exactly one soname (librtss_ota.so.1) so
+# Yocto debian.bbclass would rename it, breaking RDEPENDS and opkg queries.
+DEBIAN_NOAUTONAME:qcom-rtss-ota           = "1"
+DEBIAN_NOAUTONAME:qcom-rtss-ota-staticdev = "1"
+DEBIAN_NOAUTONAME:qcom-rtss-ota-dev       = "1"
+
+# qcom-rtss-mailbox-kmd installs rtss_mailbox_uapi.h into sysroot via
+# do_install:append — must be staged before UMD builds.
+DEPENDS = "glib-2.0 qcom-rtss-mailbox-kmd"
+
+SRC_URI = "git://github.com/qualcomm-linux/rtss-mailbox-umd.git;branch=rtss-mailbox-usr.le.0.0;protocol=https;tag=v${PV}"
+SRCREV  = "5fb8e0d5e234ab4ab8b704b7128c98e7dd7b4f83"
+
+inherit cmake
+
+EXTRA_OECMAKE += "-DSYSROOTINC_PATH=${STAGING_INCDIR} \
+                  -DSYSROOT_INCLUDEDIR=${STAGING_INCDIR}"
+
+# ---------------------------------------------------------------------------
+# Package layout
+#
+#   qcom-rtss-mailbox-umd           librtss_mailbox.so.1, librtss_safemlib.so.1
+#   qcom-rtss-mailbox-umd-staticdev librtss_mailbox.a, librtss_safemlib.a
+#   qcom-rtss-ota                   librtss_ota.so.1, rtss_ota
+#   qcom-rtss-ota-staticdev         librtss_ota.a
+#   qcom-rtss-mailbox-umd-utils     rtssdbg, rtss_console, rtss_mbdemo
+#   qcom-rtss-mailbox-umd-dev       middleware headers + unversioned .so symlinks
+#   qcom-rtss-ota-dev               OTA SDK header + unversioned .so symlink
+#
+# Internal utils (rtssdbg, rtss_console, rtss_ota) link dynamic — independent
+# of static lib availability. End users choose shared or static per their need.
+# ---------------------------------------------------------------------------
+PACKAGES =+ "qcom-rtss-ota qcom-rtss-ota-staticdev qcom-rtss-ota-dev qcom-rtss-mailbox-umd-utils"
+
+# --- qcom-rtss-mailbox-umd ---
+FILES:${PN} += "${libdir}/librtss_mailbox.so.1"
+FILES:${PN} += "${libdir}/librtss_mailbox.so.1.*"
+FILES:${PN} += "${libdir}/librtss_safemlib.so.1"
+FILES:${PN} += "${libdir}/librtss_safemlib.so.1.*"
+
+# --- qcom-rtss-ota ---
+FILES:qcom-rtss-ota += "${libdir}/librtss_ota.so.1"
+FILES:qcom-rtss-ota += "${libdir}/librtss_ota.so.1.*"
+FILES:qcom-rtss-ota += "${bindir}/rtss_ota"
+
+# --- qcom-rtss-mailbox-umd-utils ---
+FILES:qcom-rtss-mailbox-umd-utils += "${bindir}/rtssdbg"
+FILES:qcom-rtss-mailbox-umd-utils += "${bindir}/rtss_console"
+FILES:qcom-rtss-mailbox-umd-utils += "${bindir}/rtss_mbdemo"
+
+# --- qcom-rtss-mailbox-umd-staticdev ---
+# Yocto auto-populates ${PN}-staticdev with ${libdir}/*.a — explicit here for clarity.
+FILES:${PN}-staticdev += "${libdir}/librtss_mailbox.a"
+FILES:${PN}-staticdev += "${libdir}/librtss_safemlib.a"
+
+# --- qcom-rtss-ota-staticdev ---
+FILES:qcom-rtss-ota-staticdev += "${libdir}/librtss_ota.a"
+
+# --- qcom-rtss-mailbox-umd-dev ---
+FILES:${PN}-dev += "${includedir}/rtss_mailbox_api.h"
+FILES:${PN}-dev += "${libdir}/librtss_mailbox.so"
+FILES:${PN}-dev += "${libdir}/librtss_safemlib.so"
+
+# --- qcom-rtss-ota-dev ---
+FILES:qcom-rtss-ota-dev += "${includedir}/rtss_ota_lib.h"
+FILES:qcom-rtss-ota-dev += "${libdir}/librtss_ota.so"
+
+# Runtime deps
+RDEPENDS:qcom-rtss-mailbox-umd-utils += "${PN}"
+RDEPENDS:qcom-rtss-ota               += "${PN}"
+RDEPENDS:qcom-rtss-ota-staticdev     += "qcom-rtss-ota"
+RDEPENDS:qcom-rtss-ota-dev           += "qcom-rtss-ota"
+RDEPENDS:${PN}-staticdev             += "${PN}"
+RDEPENDS:${PN}-dev                   += "${PN}"
+
+do_install:append() {
+    install -d ${D}${bindir}
+    install -d ${D}${libdir}
+    install -d ${D}${includedir}
+}
+
+# Prevent unversioned .so symlinks landing in the runtime package.
+SOLIBS = ".so"
+FILES_SOLIBSDEV = ""
+