Diff for /wikisrc/ports/evbarm/raspberry_pi.mdwn between versions 1.19 and 1.64

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 [[!meta title="NetBSD/evbarm on Raspberry Pi"]]  [[!meta title="NetBSD/evbarm on Raspberry Pi"]]
   
   This page attempts to document and coordinate efforts towards NetBSD/evbarm on [Raspberry Pi](http://www.raspberrypi.org). All board variants are supported.
   
   Initial, limited, 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.  Raspberry Pi 3 support was added for NetBSD 8, and backported to NetBSD 7 in July of 2017.
   
 [[images/raspberrypi.jpg]]  [[images/raspberrypi.jpg]]
   
 This page attempts to document and coordinate efforts towards NetBSD/evbarm on [Raspberry Pi](http://www.raspberrypi.org).  [[!toc levels=2]]
   
 <small>([Raspberry Pi image](http://www.flickr.com/photos/42325803@N07/8118758647/) by Christopher Lee used under CC-By-2.0 license)</small>  <small>([Raspberry Pi image](http://www.flickr.com/photos/42325803@N07/8118758647/) by Christopher Lee used under CC-By-2.0 license)</small>
   
   # What works (and what doesn't yet)
   
   ## NetBSD 7 before July, 2017
   
    - RaspberryPi 1, and 2 (including SMP)
    - 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
    - GPIO
    - 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.
   
   ## NetBSD 7 after July, 2017 and NetBSD 8
   
    - Raspberry Pi 3 (excluding WiFi and bluetooth)
   
   ## NetBSD current
   
    - Raspberry Pi 3 bluetooth
    - Raspberry Pi 3 new SD host controller driver
   
   ## What needs work
   
    - USB (host); isochronous transfers.
    - WiFi
    - Raspberry Pi 3 in 64-bit mode.  (Note that this will be provided by the evbarm64 port, rather than evbarm.)
   
   # CPU types
   
   Note that one can also use code for earlier models on later models.
   
    - Raspberry Pi 1 uses "earmv6hf".
    - Raspberry Pi 2 uses "earmv7hf".
    - Raspberry Pi 3 uses "earmv7hf".
   
 # Installation  # Installation
  - Use the latest HEAD/-current which builds for install  
    - As the Raspberry Pi port is still not part the stable release, you will want to use the  
      HEAD branch to download installation sets.  
    - You may use the rpi.img file created by an evbarm build - evbarm-earmv6hf is recommended, but this is not currently available on nyftp. For now, evbarm-earmhf is best.  
    - An example can be found in the 'evbarm-earmhf/binary/gzimg/' directory under releng.netbsd.org  
      - On nyftp.netbsd.org/pub/NetBSD-daily/HEAD/YYYYMMDDHHMMZ (it will look like pub/NetBSD-daily/HEAD/201305220150Z)  
    - 'releasedir/evbarm/binary/gzimg/' if you run (for example) './build.sh -m evbarm -a earmv6hf -u release'  
      - <i>gunzip and dd</i> this img to your sd card.  
   
            dd if=rpi.img of=/dev/disk1  ## SD card structure
   
   The Raspberry Pi looks for firmware and a kernel on the first FAT32
   partition of the uSD card.  The NetBSD kernel will then use the FFS
   partition as the root filesystem.
   
  - Using a serial console  A 2 GB card is the smallest workable size.  The NetBSD filesystem will
    - 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)  be expanded to fit on larger cards.
   
            edit cmdline.txt and remove '"console=fb"'  ## Choosing a version
   
  - Growing the root file-system  First, decide if you want to install a formal release (7.1), a stable
    - During the partitioning process, do not delete or format the  branch build (netbsd-7, netbsd-8), or current.  Note that 7.1 predates
      first MSDOS (FAT) partition, as the Raspberry pi firmware is  Raspberry Pi 3 support.  For people who don't know how to choose among
      hard coded to boot on the SDCAD / 1st MSDOS partition / Firmware  those, netbsd-8 is probably best.
      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.  
    - 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.  ## Getting bits to install
   
    - At the partition> prompt type "A" and press return.  You can either build a release yourself with build.sh, or get one from the NetBSD FTP servers.
   
            Adjust disklabel sector from 4194304 to 62333952 [n]?  Both will provide rpi.img.gz and rpi_inst.img.gz.  Each is an image to
            Type "y" and press return.  be written to a uSD card, and has a FAT32 partition for booting.  In
   rpi.img.gz, there is also an FFS partition for NetBSD.
   
    - partition> prompt type "a" and press return.  ### Building yourself
   
            Filesystem type prompt, press return to use the current value (4.2BSD).  Getting sources and building a release with build.sh is not special for evbarm.
            Start offset prompt, press return to use the current value.  Pick a CPU type alias and pass it to build.sh with -m.  Examples:
            Partition size prompt, type "$" and press return to grow the   - ./build.sh -m earmv6hf -u release
            partition to use all available free space.   - ./build.sh -m evbarm -a earmv6hf -u release
    - ./build.sh -m evbarm -a earmv7hf -u release
   
    - partition> prompt type "W" to save the changes to the disklabel.  ### NetBSD FTP servers
   
            Confirm this choice by typing "y" at the Label disk prompt.  NetBSD provides nightly builds on [nyftp.netbsd.org](http://nyftp.netbsd.org/pub/NetBSD-daily/).  These are equivalent to building yourself.
            Type "Q" and press return to quit disklabel.  
   
    - At the # prompt (shell), type   - The 'evbarm-earmv6hf/binary/gzimg/' directory contains an rpi.img file that can be used as a single image for both boards.
    - The 'evbarm-earmv7hf/binary/gzimg/' directory contains an armv7.img file that is optimized for Raspberry Pi 2.
    - The stable build directory will be under netbsd-7/YYYYMMDDHHMMZ/ (for example, http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7/201710201440Z/evbarm-earmv6hf/binary/gzimg)    
    - The not-yet-released stable build directory will be under netbsd-8/YYYYMMDDHHMMZ/ (for example, http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-8/201710211010Z/evbarm-earmv6hf/binary/gzimg/)
    - The HEAD/current directory build will be under HEAD/YYYYMMDDHHMMZ/ (for example, http://nyftp.netbsd.org/pub/NetBSD-daily/HEAD/201710202210Z/evbarm-earmv7hf/binary/gzimg/)
   
            fsck -fy /dev/rld0a  ## Installing to uSD
            resize_ffs -y /dev/rld0a  
   
    - This may take a few minutes, be patient!  Once you have rpi.img.gz, put it on a uSD card using gunzip and dd, for example:
   
            fsck -fy /dev/rld0a   - gunzip rpi.img.gz
            mount_msdos /dev/ld0e /boot   - dd if=rpi.i7mg of=/dev/disk1
            mv /boot/cmdline.txt.orig /boot/cmdline.txt  
            reboot  
   
     - When the system comes back up, the root file-system will have been expanded to  ### Serial Console
            fill the SD card.  
   
 # Installation with sshramdisk image  By default the rpi.img is set to use the HDMI output.  If you wish to use a serial console, first mount the FAT32 partition and then
  - You may use the  rpi_inst.img.gz file created by an evbarm build.  edit cmdline.txt and remove '"console=fb"'.
  - Connect Ethernet Cable to RPI.  
    - 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"
   
   ### Installation with sshramdisk image
   
   build.sh (and hence the FTP site) also creates an image 'rpi_inst.img.gz' specifically for installation without HDMI or a serial console.  To use this method, write that image to a uSD card as above, and then:
   
    - Ensure that you have a lan with a DHCP server.
    - Connect an Ethernet cable from the RPI to the LAN.
  - After starting DHCP client, SSH login to with user "sysinst", and password "netbsd".   - 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     - 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     - Also for after the sysinst is done and the system reboots
  - sysinst started!   - sysinst started!
   
 # Updating the firmware  ## Installation via ebijun's image
  - [rpi firmware files](https://github.com/raspberrypi/firmware/tree/master/boot)  
    - Copy all files except 'kernel*.img' into /boot and reboot  
   
 # Additional links  As an alternative to the standard installation images, Jun Ebihara
  - [ARM userland utilities](https://github.com/jaredmcneill/userland)  provides an install image for Raspberry Pi that includes packages.  It
   is based on NetBSD-current and is built for earmv6hf, and thus will
   work on Raspberry Pi 1, 2 and 3.  This image is typically updated
   every few weeks.
   
 # What works   - [https://github.com/ebijun/NetBSD/blob/master/RPI/RPIimage/Image/README](https://github.com/ebijun/NetBSD/blob/master/RPI/RPIimage/Image/README)
  - multi-user boot with root on SD card  
  - serial or graphics console (with EDID query / parsing)  
  - X windows.  
  - USB (host) - dwctwo(4)  
  - USB Ethernet - usmsc(4)  
  - RNG: works  
  - I²C: works, could use enhancements, man page  
  - SPI: works, could use enhancements, man page  
  - VCHIQ: work in progress. man page missing. (-current)  
  - Audio: works. man page missing. (-current)  
   
 # What needs work  ## Updating the kernel
  - USB (host); isochronous transfers.  
  - DMA controller driver / dmover(9) backend   - Build a new kernel, e.g. using build.sh. It will tell you where the ELF version of the kernel is, e.g.
  - Teach sdhc(4) about dmover; not Raspberry Pi specific  
  - GPIO           ...
            Kernels built from RPI2:
             /Users/feyrer/work/NetBSD/cvs/src-current/obj.evbarm-Darwin-XXX/sys/arch/evbarm/compile/RPI2/netbsd
            ...
   
    - 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 (First generation Pi, Pi Zero hardware) or to /boot/kernel7.img (Pi 2, Pi 3 hardware)
    - reboot
   
   # Wireless Networking
   
     Note that the built-in WiFi in the RPI3 is not yet supported.
   
    - A Realtek 802.11n USB adaptor configures as urtwn(4).
      - Configure with wpa_supplicant in /etc/rc.conf -
   
              ifconfig_urtwn0=dhcp
              dhcpcd=YES
              dhcpcd_flags="-q -b"
              wpa_supplicant=YES
              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
   
   # GPU
   
   ## Video playback
   Accelerated video playback is supported in NetBSD 7 with the [OMXPlayer](http://pkgsrc.se/multimedia/omxplayer) application and through GStreamer with the [omx](http://pkgsrc.se/multimedia/gst-plugins1-omx) plugin.
   
   ## OpenGL ES
   Accelerated OpenGL ES is supported in NetBSD 7. The GL ES client libraries are included with the [misc/raspberrypi-userland](http://pkgsrc.se/misc/raspberrypi-userland) package.
   
   ## Quake 3
   A Raspberry Pi optimized build of *ioquake3* is available in the [games/ioquake3-raspberrypi](http://pkgsrc.se/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](http://pkgsrc.se/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](http://pkgsrc.se/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-*](http://pkgsrc.se/search.php?so=libretro-) packages. To begin using retroarch:
   
    - Install [emulators/retroarch](http://pkgsrc.se/emulators/retroarch)
    - Install the libretro core for the system you would like to emulate (lets take [emulators/libretro-gambatte](http://pkgsrc.se/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/gambatte_libretro.so game.gbc
   """]]
   
   # Developer notes
   
   These notes are for people working on improvements to RPI support in NetBSD.
   
   ## Updating the firmware
   
   You probably don't want to do this. Firmware updates can break things,
   and the latest firmware that's been tested is already included in the
   NetBSD build you installed.
   
   If you're feeling adventurous (or are the port maintainer), here's what
   to test whenever you try new firmware:
   
   - Audio
   - OMXPlayer (and [[!template id=man name="vchiq"]])
   - Serial/framebuffer console
   - CPU frequency scaling
   
   That goes for all of `rpi[0123]`.
   
   Upstream firmware releases are
   [on GitHub](https://github.com/raspberrypi/firmware/releases).
   Copy all files except `kernel*.img` into `/boot` and reboot.

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