Tue Sep 03, 2019 11:56 pm

Code: Select all sudo rpi-update

Code: Select all pi@pi4:~ $ uname -a Linux domnfs 4.19.69-v8+ #1261 SMP PREEMPT Tue Sep 3 20:27:16 BST 2019 aarch64 GNU/Linux

As the 64-bit kernel is getting more functional, I've decided to build it as part of rpi-update kernel to allow more users to test it under raspbian.This is for bleeding edge testers. Things may not work. Backing up, or using a fresh sdcard is a wise precaution.To get the kernel run the usualto get the latest kernel. If you want to switch to 64-bit kernel add to config.txtYou can still the usual 32-bit raspbian buster image just fine, but the kernel will be 64-bit.Installing and running 64-bit packages should now be possible.The 64-bit kernel (even with 32-bit raspbian) should have some performance advantages with kernel heavy loads (e.g. usb/ethernet) as we avoid some of the page mapping costs of LPAE. There may also be some (lesser) performance boost from the 64-bit kernel code.Feel free to try it. Report any tests that run faster (or slower) and anything that does or doesn't work.Note: We're focusing on Pi4 here. In theory the kernel does run on Pi3, but that's not our priority.The lack of FIQ on 64-bit kernel will reduce USB performance on Pi3 (Pi4 doesn't require the FIQ).Known issues:vcsm driver doesn't work with 64-bit (only the cma version) which will break software decode with kodiMathematica and Wolfram fail to run (detection of raspberry pi os fails) Workaround here Java 8 doesn't work. OpenJDK 11 does work.