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CFLAGS_append_aarch64 =" -D_64BIT_ARCH_SUPPORT_ "

For DBUS Enabling support

            By default, rbus is enabled in rpi4 64b build. For dbus enabling in rpi4 64b build, please follow the below steps,

Delete the below lines from below file's,
 
File path : ~/meta-cmf-raspberrypi/meta-rdk-broadband/recipes-ccsp/util/utopia.bbappend
    touch \/nvram\/rbus_support ' ${D}${sysconfdir}/utopia/utopia_init.sh 

File path : ~/meta-cmf-raspberrypi/recipes-core/dbus/dbus_%.bbappend 
do_install_append_aarch64_broadband () 
{ 
# Removing dbus service in 64bit arch alone
 rm ${D}${systemd_system_unitdir}/dbus.service 
}

Performance comparison metrics between RPi4 64 bit Vs 32 bit

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