File:  [NetBSD Developer Wiki] / wikisrc / ports / evbarm / raspberry_pi.mdwn
Revision 1.43: download - view: text, annotated - select for diffs
Mon Aug 3 00:37:05 2015 UTC (5 years, 7 months ago) by wiki
Branches: MAIN
CVS tags: HEAD
web commit by jmcneill: Multiprocessor support works now

[[!meta title="NetBSD/evbarm on Raspberry Pi"]]

This page attempts to document and coordinate efforts towards NetBSD/evbarm on [Raspberry Pi]( All board variants are supported.

Initial Raspberry Pi support was introduced in NetBSD 6.0. NetBSD 7.0 adds complete support for the board, along with introducing support for the quad-core Raspberry Pi 2 board.


[[!toc levels=2]]

<small>([Raspberry Pi image]( by Christopher Lee used under CC-By-2.0 license)</small>

# Installation
 - You may use the rpi.img file created by an evbarm build - evbarm-earmv6hf is recommended. This isn't optimized for Raspberry Pi 2, but allows a single image to be used for all boards.
   - The Raspberry Pi and Pi 2 ports will be part of the NetBSD 7 release.
   - The automatic nightly builds can be found in the 'evbarm-earmv6hf/binary/gzimg/' directory on [](
     - The stable build will be under netbsd-7/YYYYMMDDHHMMZ/evbarm-earmv6hf/binary/gzimg/
     - The HEAD/current build will be under HEAD/YYYYMMDDHHMMZ/evbarm-earmv6hf/binary/gzimg/
     - For example,
   - 'releasedir/evbarm/binary/gzimg/' if you run (for example) './ -m evbarm -a earmv6hf -u release'
   - <i>gunzip and dd</i> this img to your sd card.

	   dd if=rpi.img of=/dev/disk1

 - Using a serial console
   - By default the rpi.img is set to use the HDMI output; to change to using a serial console first mount rpi.img (it's a FAT filesystem)

	   edit cmdline.txt and remove '"console=fb"'

   - Most (all?) USB-to-TTL serial adapters only connect Tx, Rx and ground, and do not connect any flow control lines. An effect of missing flow control is that you see console output, but cannot type anything. If so, adjust your serial console application's flow control settings to "none". 

      In Kermit, the command is "set flow none".

      In minicom, run "minicom -s" and set hardware flow control to "no"

 - Growing the root file-system (**not required with NetBSD -current after 2015-04-07**)
   - During the partitioning process, do not delete or format the
     first MSDOS (FAT) partition, as the Raspberry pi firmware is
     hard coded to boot on the SDCAD / 1st MSDOS partition / Firmware
     updates and boot loader.
   - Copy /boot/cmdline.txt to /boot/cmdline.txt.orig
   - Edit /boot/cmdline.txt and add the '-s' flag to the end of the first line of text to boot into single-user mode.
   - For the next steps, the root filesystem mustn't be mounted rw. So reboot, and at the prompt to enter the pathname of shell,
     press return for the default (/bin/sh).
   - At the # prompt, type

        "disklabel -i ld0" and press return.

   - At the partition> prompt type "A" and press return.

           Adjust disklabel sector from 4194304 to 62333952 [n]?
           Type "y" and press return.

   - partition> prompt type "a" and press return.

           Filesystem type prompt, press return to use the current value (4.2BSD).
           Start offset prompt, press return to use the current value.
           Partition size prompt, type "$" and press return to grow the
           partition to use all available free space.

   - partition> prompt type "W" to save the changes to the disklabel.

           Confirm this choice by typing "y" at the Label disk prompt.
           Type "Q" and press return to quit disklabel.

   - At the # prompt (shell), type

           fsck -fy /dev/rld0a
           resize_ffs -y /dev/rld0a

   - This may take a few minutes, be patient!

           fsck -fy /dev/rld0a
           mount_msdos /dev/ld0e /boot
           mv /boot/cmdline.txt.orig /boot/cmdline.txt

    - When the system comes back up, the root file-system will have been expanded to
	   fill the SD card.

# Installation with sshramdisk image
 - You may use the  rpi_inst.img.gz file created by an evbarm build.
 - Connect Ethernet Cable to RPI.
 - After starting DHCP client, SSH login to with user "sysinst", and password "netbsd".
   - Be careful to note the ip address given during DHCP so you don't lose your connection
   - Also for after the sysinst is done and the system reboots
 - sysinst started!

# Updating the firmware
 - [rpi firmware files](
   - Copy all files except 'kernel*.img' into /boot and reboot

# Updating the kernel
 - Build a new kernel, e.g. using It will tell you where the ELF version of the kernel is, e.g.

         Kernels built from RPI2:

 - Besides the "netbsd" kernel in ELF format, there is also a "netbsd.bin" kernel that is in a format that the Raspberry can boot. 
 - Depending on your hardware version, copy this either to /boot/kernel.img (old/V1 hardware) or to /boot/kernel7.img (new/V2 hardware)
 - reboot

# Wireless Networking
 - A Realtek 802.11n USB adaptor configures as urtwn(4).
   - Configure with wpa_supplicant in /etc/rc.conf -

           dhcpcd_flags="-q -b"
           wpa_supplicant_flags="-B -i urtwn0 -c /etc/wpa_supplicant.conf"
   - A sample wpa_supplicant.conf can be found at /usr/share/examples/wpa_supplicant/wpa_supplicant.conf


## Video playback
Accelerated video playback is supported in NetBSD 7 with the [OMXPlayer]( application and through GStreamer with the [omx]( plugin.

## OpenGL ES
Accelerated OpenGL ES is supported in NetBSD 7. The GL ES client libraries are included with the [misc/raspberrypi-userland]( package.

## Quake 3
A Raspberry Pi optimized build of *ioquake3* is available in the [games/ioquake3-raspberrypi]( package. To use it, the following additional resources are required:

 - pak0.pk3 from Quake 3 CD
 - additional pak files from the [games/ioquake3-pk3]( package
 - read/write permissions on /dev/vchiq and /dev/wsmouse

Place the pak0.pk3 file in the /usr/pkg/lib/ioquake3/baseq3 directory.

## RetroArch / Libretro
Using [emulators/retroarch]( it is possible to run many emulators at full speed the Raspberry Pi. Emulator cores for various gaming consoles are available in the [emulators/libretro-*]( packages. To begin using retroarch:

 - Install [emulators/retroarch](
 - Install the libretro core for the system you would like to emulate (lets take [emulators/libretro-gambatte](, a GameBoy Color emulator, as an example).
 - Plug in a USB HID compatible Gamepad, such as the Logitech F710 in "DirectInput" mode (set "D/X" switch to "D").
 - Create a config file for your gamepad using *retroarch-joyconfig*.
[[!template  id=programlisting text="""
$ retroarch-joyconfig -o gamepad.cfg
 - Launch the emulator from the command-line (no X required):
[[!template  id=programlisting text="""
$ retroarch --appendconfig gamepad.cfg -L /usr/pkg/lib/libretro/ game.gbc

# What works (NetBSD 7.0+)
 - multi-user boot with root on SD card
 - serial or graphics console (with EDID query / parsing)
 - DMA controller driver and sdhc(4) support
 - Audio: works. man page missing.
 - I²C: works, could use enhancements, man page
 - RNG
 - SPI: could use enhancements, man page
 - GPU (VCHIQ) - 3D and video decode. man page missing.
 - USB (host) - dwctwo(4)
 - USB Ethernet - usmsc(4)
 - X windows.
 - RaspberryPi 2 SMP

# What needs work
 - USB (host); isochronous transfers.

CVSweb for NetBSD wikisrc <> software: FreeBSD-CVSweb