Raspberry Pi 3 - 64-bit Gentoo

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

NeddySeagoon,

by the gcc that installs in /opt you mean the one provided by you in your BINHOST, or you mean something completely different?

NeddySeagoon · Posted: Sat Apr 30, 2016 8:29 pm Post subject:

vanjo9800,

Something different, it was from schorsch_76 but was based on NoName1337s script.

A binhost allows you to emerge the packages it contains. You don't get to choose the USE flags.
_________________
Regards,

NeddySeagoon

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

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

Ok, the cross GCC seems to work fine in compiling other packages and in compiling the native GCC, but I face another problem:

NeddySeagoon · Posted: Sun May 01, 2016 2:34 pm Post subject:

vanjo9800,

I have swap on an external USB drive.

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

I do not know currently for the SDcard driver and whether I have DMA enabled. I will check after the compilation of GCC ends.

So I configured a USB drive as a swap partition and the Raspberry started swapping on it. The build goes like the normal. However, when compiling /var/tmp/portage/sys-devel/gcc-5.3.0/work/gcc-5.3.0/gcc/alias.c the RAM overflows and it starts using the swap. However, I think that there may be a problem because it stays on compiling alias.c for around an hour and more. I compile with:

NeddySeagoon · Posted: Sun May 01, 2016 8:06 pm Post subject:

vanjo9800,

I only had one core when I built gcc.

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

NeddySeagoon,

I managed to compile GCC in around 15 hours with only -j1. It compiled successfully and now I am building some more packages. For the SD card drivers, I still do not I will check soon and tell you. However, the performance of the SD card is awful, so I think something is not right.

Now I want to ask about something different, have you managed to use the built-in Wifi and Bluetooth on the board? And if yes, how?

Thank you in advance!!!

NeddySeagoon · Posted: Mon May 02, 2016 6:12 pm Post subject:

vanjo9800,

I've not tried the bluetooth but I'm fairly sure its off as its attached to one of the UARTs.
As my config.txt is fairly minimal and devices are off unless explicitly enabled, both the WiFi and Bluetooth are off.

I don't have any use for bluetooth and the wifi is just a curiosity since it will soak up CPU and RAM to perform the crypto.
The WiFi is a SDIO chip, so seeing

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

Ok I will read that, thank you for the information!

Another question, does it worth to set up distcc on the Raspberry Pi 3 because the board is powerful enough to compile most of the packages in a reasonable amount of time?

NeddySeagoon · Posted: Mon May 02, 2016 6:43 pm Post subject:

vanjo9800,

Its worth it when it works. I've been using pump mode with distcc but I keep seeing warnings about failing to distribute.
I have a hunch that distcc is getting swapped out, so distributing times out.

Swapped out does no mean to the swap partition. The kernel has several swap mechanims.
a) swap partition/file. This is only used for dynamically allocated RAM, as it has no fixed location on HDD.
b) 'dirty' buffers can be flushed to disk and the buffer RAM released.
c) code/data read from disk can be released and reloaded later.

The kernel does all of these things. Not having swap space denies it option a). It does not mean that the kernel is not swapping.

c) means that Linux can run (slowly) programs that are too big to fit in RAM, as RAM occupied by code that's not required right now can be freed to load other code that is, then the first code can be reloaded when its required.

I've not looked at fixing distcc yet. It has crossed my mind to install the Pi3 64 bit code to /usr/aarch64-unknown-linux-gnu/ so that cross compililtg can do better. That could be another can of worms though, since lots of things don't cross compile.
_________________
Regards,

NeddySeagoon

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

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

Hello NeddySeagoon,

The Gentoo is working pretty fine. Sadly, I cannot manage to find open-source drivers for the Wi-Fi, but that is not a problem because I do not need it currently. After testing the SD card on the Pi 3, on my laptop with hdparm, it gave performance around 33Mb/s.

However, when I test it on the Pi, I receive the following:

NeddySeagoon · Posted: Sun May 08, 2016 4:05 pm Post subject:

vanjo9800,

Which kernel are you using?
With 33Mb/sec read speed, it sounds like DMA is on.

The WiFI driver has been in the mainline kernel for a while and should just work.
Its one of the sdio drivers
The Pi has several sdio ports, the question is, where is the wifi.
_________________
Regards,

NeddySeagoon

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

NeddySeagoon · Posted: Sun May 08, 2016 4:25 pm Post subject:

vanjo9800,

I had forgotten all about hdpram. Its intended for IDE HDD. Sone of the things it can do are not valid on SDCards.

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

For the WiFI, I checked the brcmfmac driver and I have both SDIO and USB support enabled, but still nothing happens when I modprobe it.

NeddySeagoon · Posted: Sun May 08, 2016 5:35 pm Post subject:

vanjo9800,

Same here.
My guess is that the sdio its attached to is off, that's the default state for Pi I/O as some things share.
We need the right entry in config.txt before the kernel can see the WiFi.
_________________
Regards,

NeddySeagoon

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

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

So after reading some documentations of Broadcom drivers, I found out that in order an SDIO driver to work special firmware from broadcom and a NVRAM are needed to be placed in the directory with modules. However, they say that the kernel itself should say which NVRAM is needed, but the kernel says nothing.

Also, I am not sure what is the Wireless and BLE chip in the Raspberry, I found it on Adafruit as BCM43143, while on other places as BCM43438. There is a big difference between both because I saw more documentation for the former, while for the latter there wasn't any.

I hope this can be somehow helpful to you, if you didn't know it previously.

NeddySeagoon · Posted: Sun May 08, 2016 9:33 pm Post subject:

vanjo9800,

The WiFi chip is on the bottom of the Pi. Turn it over and hold it with the SDCard at the top.
The WiFi is the silver chip to the left of the SDCard. The part number is on it but you may nee a magnifying glass or even a microscope to read it.

The kernel won't see the wifi until the SDIO its attached to is enabled.
_________________
Regards,

NeddySeagoon

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

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

Ok, I will leave the WiFi up to now. Can you tell me when there is progress with the WiFi.

Now, I experience two small software problems with the Pi. First, whenI try to install raspberrypi-userland and the first patch fails. What could be a possible reason for this.
The second problems is when I try to install systemd, it gives a dbus error about version 1.6.8. I read that it can be caused by selinux masking systemd, but I do not use a selinux profile. What could be a possible reason for this.

Thank you in advance!!!

[EDIT]
Some logs

About Systemd and Dbus:

NeddySeagoon · Posted: Wed May 11, 2016 5:46 pm Post subject:

vanjo9800,

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

Hello NeddySeagoon,

I managed to install systemd. The problem was that it was disabled as a use flag because gnome does not have support for arm64. Systemd also did not have support for arm64 previously, but now it has.

It installed without a problem, but now I need to put

NeddySeagoon · Posted: Mon May 16, 2016 5:19 pm Post subject:

vanjo9800,

Stop u-boot from booting, so you get to the u-boot> prompt.
Enter the command

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

Thank you for the fast response NeddySeagoon,

The shortcut is the u-boot.env file. I have used it in the beginning with the normal u-boot.

However, with the Electron752's stubbed u-boot the only configurational file for u-boot is boot.scr.uimg. Also typing what you said gave an error:

NeddySeagoon · Posted: Mon May 16, 2016 6:32 pm Post subject:

vanjo9800,

Thats odd. When you use u-boot, bootargs is the kernel command line.
It could be blank but then I don't think it would boot.
What does

vanjo9800 · Tux's lil' helper Joined: 16 Mar 2015 Posts: 76

So printenv prints information about the boot configuration, but my screen is too small in order to see the bootargs which are at the top.

And I do not have a file named uboot.env in my boot partition. The only files associated with uboot there are uboot-stubbed.bin and boot.scr.uimg. When I display the boot.scr.uimg as a text file, I see some binary parts, however there I also see the current kernel command line. However, if I change the text in this file, uboot gives an error while booting...

NeddySeagoon · Posted: Tue May 17, 2016 8:26 pm Post subject:

vanjo9800,

uboot drives the serial console as well as the HDMI video output.
My uboot example was actually copy/pasted from minicom on a PC.

uboot looks after some or all of its files with a CRC, so its not possible to edit them without using uboot.

You get a uboot.env by executing saveenv.
You set bootargs with setenv bootargs
_________________
Regards,

NeddySeagoon

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