Customize the initramfs package - Qualcomm Dragonwing Documentation

To update the initramfs package contents, modify the PACKAGE_INSTALL list in meta-qcom/recipes-kernel/images/initramfs-qcom-image.bb:

DESCRIPTION = "Ramdisk image for pivoting into rootfs"

PACKAGE_INSTALL += " \
    base-passwd \
    initramfs-module-copy-modules \
    initramfs-module-rootfs \
    initramfs-module-udev \
    ${VIRTUAL-RUNTIME_base-utils} \
    ${MACHINE_ESSENTIAL_EXTRA_RDEPENDS} \
    ${ROOTFS_BOOTSTRAP_INSTALL} \
    "

After modifying PACKAGE_INSTALL, rebuild the full image to apply the change:

bitbake qcom-multimedia-image

For instructions on building and integrating out-of-tree kernel modules, see Manage out-of-tree kernel modules.