Raspberry Pi 4 Support

[skylartaylor]

Hi! I wanted to let you know that I was able to use your image on my Raspberry Pi 4b with the kernel and config.txt tweak provided here: https://github.com/sakaki-/bcm2711-kernel-bis

The current build there does have an issue with WiFi, but there's an open PR (new as of a few hours ago) to fix that here: https://github.com/raspberrypi/linux/pull/3159

These changes will likely go upstream pretty quickly, but you could probably build with it manually in the meantime if you'd like!

[DieterReuter]

@skylartaylor, this is pretty great to hear. Have to test this kernel build, too. Let's see if we could use this kernel to fully automatically create a SD card image...

[DieterReuter]

Just want to confirm, it's pretty easy to manually create a SD card for booting a 64bit kernel on the Pi4.

1. flash the latest 64bit image from releases of this repo

• this will flash the SD card with a 64bit OS (rootfs is Debian Stretch), with 64bit kernel for Pi3

$ flash hypriotos-rpi64-v20190720-125849.img.zip
$ umount /dev/mmcblk0p2
$ umount /dev/mmcblk0p1

2. follow the instructions at https://github.com/sakaki-/bcm2711-kernel-bis

• this will install the 64bit kernel for Pi4 on the SD card

$ mkdir -pv /mnt/piroot
$ mount -v /dev/mmcblk0p2 /mnt/piroot
$ mount -v /dev/mmcblk0p1 /mnt/piroot/boot

$ wget https://github.com/sakaki-/bcm2711-kernel-bis/releases/download/4.19.67.20190827/bcm2711-kernel-bis-4.19.67.20190827.tar.xz
$ tar xvf bcm2711-kernel-bis-4.19.67.20190827.tar.xz -C /mnt/piroot/

3. append these settings to "confix.txt" to boot the new Pi4 kernel

[pi4]
# Enable DRM VC4 V3D driver on top of the dispmanx display stack
dtoverlay=vc4-fkms-v3d
max_framebuffers=2
arm_64bit=1
# differentiate from Pi3 64-bit kernels
kernel=kernel8-p4.img

$ vi /mnt/piroot/boot/config.txt
$ umount -v /mnt/piroot/{boot,}

4. insert the prepared SD card into your Pi4, you can also attach a serial console cable because serial UART is enabled. Login with username=pirate and password=hypriot

RESULT:

64bit kernel for Pi4 is running:

HypriotOS/arm64: pirate@black-pearl in ~
$ uname -a
Linux black-pearl 4.19.67-v8-174fcab91765-p4-bis+ #2 SMP PREEMPT Tue Aug 27 13:58:09 GMT 2019 aarch64 GNU/Linux

4x CPU's:

HypriotOS/arm64: pirate@black-pearl in ~
$ cat /proc/cpuinfo 
processor       : 0
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

processor       : 1
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

processor       : 2
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

processor       : 3
BogoMIPS        : 108.00
Features        : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant     : 0x0
CPU part        : 0xd08
CPU revision    : 3

4 GByte of Memory available:

HypriotOS/arm64: pirate@black-pearl in ~
$ cat /proc/meminfo 
MemTotal:        3948868 kB
MemFree:         3525024 kB
MemAvailable:    3729996 kB
Buffers:           26680 kB
Cached:           214040 kB
SwapCached:            0 kB
Active:           136376 kB
Inactive:         166360 kB
Active(anon):      62384 kB
Inactive(anon):    10388 kB
Active(file):      73992 kB
Inactive(file):   155972 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:             0 kB
SwapFree:              0 kB
Dirty:                16 kB
Writeback:             0 kB
AnonPages:         62120 kB
Mapped:            65640 kB
Shmem:             10752 kB
Slab:              59644 kB
SReclaimable:      24412 kB
SUnreclaim:        35232 kB
KernelStack:        2128 kB
PageTables:         1072 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     1974432 kB
Committed_AS:     423728 kB
VmallocTotal:   263061440 kB
VmallocUsed:           0 kB
VmallocChunk:          0 kB
Percpu:              928 kB
CmaTotal:         262144 kB
CmaFree:          222544 kB

[d11wtq]

This is awesome. Any ETA on when a proper release will have this?