Diff for /wikisrc/ports/evbarm/raspberry_pi.mdwn between versions 1.19 and 1.45

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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.
   
 [[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>
   
 # Installation  # Installation
  - Use the latest HEAD/-current which builds for install   - The automatic nightly builds  on [nyftp.netbsd.org](http://nyftp.netbsd.org/pub/NetBSD-daily/) provide image files that can be used for installation. The Raspberry Pi and Pi 2 ports will be part of the NetBSD 7 release.
    - As the Raspberry Pi port is still not part the stable release, you will want to use the      - The 'evbarm-earmv6hf/binary/gzimg/' directory contains an rpi.img file that can be used as a single image for both boards.
      HEAD branch to download installation sets.      - The 'evbarm-earmv7hf/binary/gzimg/' directory, as of August 6th 2015, contains an armv7.img file that is optimized for Raspberry Pi 2.
    - 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.      - The stable build directory will be under netbsd-7/YYYYMMDDHHMMZ/ (for example, http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7/201412161700Z/evbarm-earmv6hf/binary/gzimg/)
    - An example can be found in the 'evbarm-earmhf/binary/gzimg/' directory under releng.netbsd.org      - The HEAD/current directory build will be under HEAD/YYYYMMDDHHMMZ/ (for example, http://nyftp.netbsd.org/pub/NetBSD-daily/netbsd-7/201508062150Z/evbarm-earmv7hf/binary/gzimg/)
      - On nyftp.netbsd.org/pub/NetBSD-daily/HEAD/YYYYMMDDHHMMZ (it will look like pub/NetBSD-daily/HEAD/201305220150Z)    - You can build your own version of these images using (for example) './build.sh -m evbarm -a earmv6hf -u release', or './build.sh -m evbarm -a earmv7hf -u release'
    - '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. For example,
      - <i>gunzip and dd</i> this img to your sd card.  
   
            dd if=rpi.img of=/dev/disk1             dd if=rpi.img of=/dev/disk1
   
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            edit cmdline.txt and remove '"console=fb"'             edit cmdline.txt and remove '"console=fb"'
   
  - Growing the root file-system     - 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, or by NetBSD 7 after 2015-08-06**)
    - During the partitioning process, do not delete or format the     - During the partitioning process, do not delete or format the
      first MSDOS (FAT) partition, as the Raspberry pi firmware is       first MSDOS (FAT) partition, as the Raspberry pi firmware is
      hard coded to boot on the SDCAD / 1st MSDOS partition / Firmware       hard coded to boot on the SDCAD / 1st MSDOS partition / Firmware
      updates and boot loader.       updates and boot loader.
    - Copy /boot/cmdline.txt to /boot/cmdline.txt.orig     - 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.     - 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     - For the next steps, the root filesystem mustn't be mounted rw. So reboot, and at the prompt to enter the pathname of shell,
            return for the default (/bin/sh).       press return for the default (/bin/sh).
    - At the # prompt, type     - At the # prompt, type
   
         "disklabel -i ld0" and press return.          "disklabel -i ld0" and press return.
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  - sysinst started!   - sysinst started!
   
 # Updating the firmware  # Updating the firmware
  - [rpi firmware files](https://github.com/raspberrypi/firmware/tree/master/boot)  
    - Copy all files except 'kernel*.img' into /boot and reboot  
   
 # Additional links  You probably don't want to do this. Firmware updates can break things,
  - [ARM userland utilities](https://github.com/jaredmcneill/userland)  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
   
   Upstream firmware releases are
   [on GitHub](https://github.com/raspberrypi/firmware/releases).
   Copy all files except `kernel*.img` into `/boot` and reboot.
   
   # Updating the kernel
    - Build a new kernel, e.g. using build.sh. It will tell you where the ELF version of the kernel is, e.g.
   
            ...
            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 (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 -
   
              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
   """]]
   
 # What works  # What works (NetBSD 7.0+)
  - multi-user boot with root on SD card   - multi-user boot with root on SD card
  - serial or graphics console (with EDID query / parsing)   - serial or graphics console (with EDID query / parsing)
  - X windows.   - 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 (host) - dwctwo(4)
  - USB Ethernet - usmsc(4)   - USB Ethernet - usmsc(4)
  - RNG: works   - X windows.
  - I²C: works, could use enhancements, man page   - RaspberryPi 2 SMP
  - SPI: works, could use enhancements, man page  
  - VCHIQ: work in progress. man page missing. (-current)  
  - Audio: works. man page missing. (-current)  
   
 # What needs work  # What needs work
  - USB (host); isochronous transfers.   - USB (host); isochronous transfers.
  - DMA controller driver / dmover(9) backend  
  - Teach sdhc(4) about dmover; not Raspberry Pi specific  
  - GPIO  

Removed from v.1.19  
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