Raspberry Pi 3 - 64 Bit Operation

Zucca · Posted: Wed Sep 21, 2016 11:36 am Post subject:

Thanks Neddy.

I'll try to find matching one close by here. :)

NeddySeagoon · Posted: Wed Sep 28, 2016 7:49 am Post subject:

Team,

Just because I can, I'm moving my aarch64-unknown-linux-gnu Pi 3 to gcc-6.2.0-r1 and the gold linker.
So far, its

Zucca · Posted: Sat Oct 01, 2016 11:16 pm Post subject:

NeddySeagoon · Posted: Sun Oct 02, 2016 10:20 am Post subject:

Zucca,

It all worked except
llvm - which repeatably locks the Pi up hard.
iproute2 - triggers an internal linker error
libreoffice - I was doing some electrics in the garage and took out all the power after about 8 hours, so its untested.
It was the last package.

I turned off -pipe a long time ago but I'm thinking about turning it on again.
If there is insufficient RAM, intermediate files will still be passed on disk.

I'm using the linux-next kernel with the .dtb from the bcm2837 because the .dts in linux-next has (at least) some clocks missing/incorrect.
The linux-next dts does not provide working USB, so you only get a serial console - I've not tested that.
The linux-next kernel with the bcm2837 .dtb gets you working USB and ethernet but no mmc.
I can live with that as everything except /boot is on a USB HDD.

Sound over HDMI needs the vc4 to work in 64 bit mode. That will be hard. The internet suggests it may need changes to the raspberrypi firmware.
Stereo analogue sound, mmc and wifi should all work once the dts is fixed in linux-next. Maybe bluetooth too. All the bits are out there, they just need
to be brought together.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

Zucca · Posted: Sun Oct 02, 2016 7:07 pm Post subject:

Hi Neddy.

NeddySeagoon · Posted: Sun Oct 02, 2016 8:34 pm Post subject:

Zucca,

My tarballs are based on the bcm2837 kernel. There is no WiFi there but for different reasons.
I've taken to following the upstream kernel as there is lots going on on both arm64 and Raspberry Pi fronts.

The upstream kernel appears to have all the kernel modules needed for wifi and mmc, so I'm
trying to add in other device tree bits and pieces.
I'm learning how much I don't know about device trees in the process.

Real life has been getting in the way this last month or so, so it was easy to let the Pi build
gcc-6.2 and rebuild world as it didn't need much of my time.
I've been trying to add ~arm64 keywords to the tree but that's stalled meanwhile too.

The Pi 3 has the same I/O as all the other Pis. Everything is on a single USB2 port except
the mmc card. In the Pi3, the wifi is on mmc1 and the bluetooth on a serial port.
The 64 bit CPU was intended (by the Raspberry Pi Foundation) to be a go faster arm7a.

Not using it in 64 bit mode sees like a waste. Rather like a 32 bit install on a 64 bit PC.

It looks like various people have had all the bits working except the vc4, but not all at the same time.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

Zucca · Posted: Sun Oct 02, 2016 10:00 pm Post subject:

NeddySeagoon · Posted: Mon Oct 03, 2016 7:10 am Post subject:

Zucca,

My understanding at present is that mmc is used for the sdcard and sdhost is used for the wifi.
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Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

Zucca · Posted: Fri Oct 07, 2016 12:39 pm Post subject:

Neddy, I'm asking if you just happen to have any experience on this...
I'm thinking of buying the offical 7" touch screen for my RPi3. Do you think it would work out-of-the-box with the Gentoo system I got from your site? Maybe just only running xrandr when X starts?
At first I don't need the touch functionality at all.
_________________
..: Zucca :..

NeddySeagoon · Posted: Fri Oct 07, 2016 4:29 pm Post subject:

Zucca,

Probably not. I've almost certainly dropped the kernel drivers. Also, it will need a device tree overlay to set everything up.
There is probably a 32 bit device tree overlay in /boot/overlays. However, that may not work with the dtb in use in boot.

Looks like a fun project though.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

Zucca · Posted: Fri Oct 07, 2016 4:38 pm Post subject:

Zucca · Posted: Fri Oct 07, 2016 5:32 pm Post subject:

I find this driver loading and device tree thing very confusing. I've always just relied on /etc/modprobe.d, kernel configuring and others to manage drivers...
I'll start digging around now. This looks promising: https://www.raspberrypi.org/documentation/configuration/device-tree.md
_________________
..: Zucca :..

NeddySeagoon · Posted: Fri Oct 07, 2016 10:46 pm Post subject:

Zucca,

Its a start. /usr/src/linux/Documentation/devicetree/ is good too.

The devicetree describes the hardware to the kernel, so that DMA, IRQs memory mapped I/O and so on does not need to be hard coded.
If you remember the good old days of the ISA bus and cards with jumpers, its like putting all the jumper settings into a single file.
It means that the same kernel code will work for different embedded systems that have the same hardware but connected differently.
Its more than that but that likens it to something in the PC world.

There is a twist. Lots of things are optional and may be mutually exclusive, because they use the same resources in different ways.
This is where device tree overlays come to the rescue. Each overlay describes a single device.

On the Pi, they are loaded by naming them in config.txt.
Before the kernel starts the boot loader code assembles the entire device tree so that the kernel can find it when it starts.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

Zucca · Posted: Sat Oct 08, 2016 10:26 am Post subject:

antonlacon · Apprentice Joined: 27 Jun 2004 Posts: 257

NeddySeagoon · Posted: Tue Nov 15, 2016 11:47 am Post subject:

antonlacon,

Hmm, I thought I had ... but # CONFIG_ZRAM is not set :(
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NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

NeddySeagoon · Posted: Thu Dec 01, 2016 9:45 pm Post subject:

Raspberry Pi 3 64 bit Updated earlier today.

Now with gcc-6.2.0-r1, ld.gold and firefox (with USE=bindist)
Still no WiFi, Bluetooth, nor anything that needs the GPU. That's all sound and hardware accelerated video.

If you prefer the pieces, the BINHOST is also available.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

NeddySeagoon · Posted: Mon Dec 26, 2016 12:19 pm Post subject:

Raspberry Pi 3 64 bit Raspberry Pi 3 64 bit.
Now with wifi and bluetooth and faster microSD card support.

Also included, firefox with USE=bindist, and icedtea java, built using Oracles java VM.
Its quite usable headless.

The BINHOST has changed very little and has not yet been updated.
Most of the changes since the last update are to the kernel.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

NeddySeagoon · Posted: Wed Mar 29, 2017 6:50 pm Post subject:

The First Anniversary Pi 64 bit Update is out.

As always, its two file systems to boot a Pi 3 in 64 bit mode.
The contents list tells what built and installed.
That does not mean that it works.

The BINHOST will be useful on any ARM Cortex-A53 install unless that install was built with gcc-4.x
in which case, the C++ packages will be incompatible due to the ABI change.
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.