README: document 64 bit r-pi3 variant for MACHINE
@@ -81,6 +81,7 @@ c. Set MACHINE in local.conf to one of the supported boards:
- raspberrypi0-wifi
- raspberrypi2
- raspberrypi3
+ - raspberrypi3-64 (64 bit kernel & userspace)
- raspberrypi-cm (dummy alias for raspberrypi)
- raspberrypi-cm3 (dummy alias for raspberrypi2)
d. bitbake rpi-hwup-image
