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version 1.2, 2014/10/20 10:42:07 version 1.37, 2014/12/07 14:28:37
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 [[!meta title="NetBSD/evbarm on Allwinner Technology SoCs"]]  [[!meta title="NetBSD/evbarm on Allwinner Technology SoCs"]]
   
   [[!toc levels=2]]
   
 # Supported boards  # Supported boards
  - BananaPi (BPI)   - [Banana Pi](http://www.bananapi.org/p/product.html) (BPI)
  - Cubieboard, Cubieboard 2 (CUBIEBOARD)   - Cubieboard 2 (CUBIEBOARD)
    - Cubieboard 4 (ALLWINNER_A80) *NetBSD-current*
  - Cubietruck (CUBIETRUCK)   - Cubietruck (CUBIETRUCK)
  - Merrii Hummingbird A31 (HUMMINGBIRD_A31)   - [Merrii Hummingbird A31](http://www.merrii.com/en/pla_d.asp?id=172) (HUMMINGBIRD_A31)
   
 # Supported hardware  # Supported hardware
  - SoCs   - SoCs
    - Cortex-A8: A10     - Cortex-A7: A20 (2-core), A31 (4-core), A80
    - Cortex-A7: A20, A31 SoCs     - Cortex-A7/A15: A80 (4-core A7 + 4-core A15)
  - SD/MMC controller   - SD/MMC controller (DMA)
  - DMA controller   - DMA controller
  - GPIO   - GPIO
      - Configuration using FEX scripts is supported
  - UART   - UART
  - I2C   - I2C
  - P2WI (A31)   - P2WI (A31) / RSB (A80)
  - PMU   - PMU
    - AXP209 (A20)     - AXP209 (A20)
    - AXP221 (A31)     - AXP221 (A31)
      - AXP806 (A80)
      - AXP809 (A80)
  - Watchdog timer   - Watchdog timer
  - RTC   - RTC
  - Audio codec     - A20/A31: integrated RTC, PCF8563
  - USB     - A80: AC100
    - Audio codec (A20/A31)
    - USB host
    - OHCI     - OHCI
    - EHCI     - EHCI
    - MOTG (not yet working on A31)     - OTG (A20)
  - SATA (A10/A20)   - SATA (A10/A20)
  - Gigabit Ethernet (GMAC)   - Gigabit Ethernet (GMAC)
    - HDMI (A20/A31)
      - DDC / EDID mode detection
      - Audio support
    - Framebuffer (A20/A31)
    - IR receiver (A20/A31)
   
   # TODO
    - SoCs
      - Cortex-A8: A10
      - Cortex-A7/A15: A80 SMP
    - OTG (A31)
    - USB device mode
    - Bluetooth / WiFi (Cubietruck, Hummingbird A31)
    - 3G (Hummingbird A31)
    - SD/MMC UHS-I support (needs sdmmc(4) changes)
    - TV input (Hummingbird A31)
    - NAND
    - Fast Ethernet (EMAC)
    - IR transmitter (A20)
   
 # Installation  # Installation
   
 ## A10 / A20 based boards  ## A10 / A20 / A31 based boards
   
 * Start with an ARMv7 image from *evbarm-earmv7hf/binary/gzimg/* board such as *beaglebone.img*  * Start with an ARMv7 image from *evbarm-earmv7hf/binary/gzimg/* such as *beagleboard.img*
 * Download a U-Boot build for your board from the linux-sunxi web site <http://dl.linux-sunxi.org/nightly/u-boot-sunxi/u-boot-sunxi/u-boot-sunxi-latest/>  * Download a U-Boot build for your board
     * A10/A20: Download from the linux-sunxi web site <http://dl.linux-sunxi.org/nightly/u-boot-sunxi/u-boot-sunxi/u-boot-sunxi-latest/>
     * A31: The standard u-boot-sunxi tree doesn't support A31 yet. Until sun6i support is merged, a build is available at <http://dis.invisible.ca/allwinner/a31/> 
 * Write the *u-boot-sunxi-with-spl.bin* loader to the base image:  * Write the *u-boot-sunxi-with-spl.bin* loader to the base image:
 [[!template  id=programlisting text="""  [[!template  id=programlisting text="""
 # dd if=u-boot-sunxi-with-spl.bin of=beaglebone.img bs=1k seek=8 conv=notrunc  # dd if=u-boot-sunxi-with-spl.bin of=beagleboard.img bs=1k seek=8 conv=notrunc
 """]]  """]]
 * Write the image to an SD card.  * Write the image to an SD card.
 * Copy the kernel (netbsd.ub) for your board to the root of the MSDOS partition.  * Copy the kernel (netbsd.ub) for your board to the root of the MS-DOS partition.
 * Create or edit uEnv.txt on the MSDOS partition:  * Create or edit uEnv.txt on the MS-DOS partition:
 [[!template  id=programlisting text="""  [[!template  id=programlisting text="""
 bootargs=root=ld0a  bootargs=root=ld0a
 uenvcmd=mmc dev 0; mmc rescan; fatload mmc 0:1 82000000 netbsd.ub; bootm 82000000  uenvcmd=mmc dev 0; mmc rescan; fatload mmc 0:1 82000000 netbsd.ub; bootm 82000000
 """]]  """]]
   
 ## A31 based boards  ## A80 based boards
   
   * Cubieboard 4 SDK (lubuntu) U-Boot env:
   [[!template  id=programlisting text="""
   baudrate=115200
   boot_normal=fatload mmc 0:1 20007800 uimage;bootm 20007800
   bootcmd=run setargs_cubie boot_normal
   bootdelay=3
   console=ttyS0,115200
   console1=tty1
   init=/init
   loglevel=8
   mmc_root=/dev/mmcblk0p2
   setargs_cubie=setenv bootargs console=${console1} console=${console} root=${mmc_root} loglevel=${loglevel}
   stderr=serial
   stdin=serial
   stdout=serial
   """]]
   
   # Big (endian) fun
   
 TBD.  You can run this boards with a little endian (this is the default and implied by above install instructions)
   or with a big endian kernel and userland. However, kernel and userland endianness needs to match.
   
   To build a big endian release (or sets) use 
   [[!template  id=programlisting text="""
   ./build.sh -m evbearmv7hf-eb 
   """]]
   where -eb means endianness big, hf is hardware floating point support, and earm is the modern "extended" ABI for ARM CPUs, and finally v7 is version 7 of the supported instruction set.
   
   # FEX scripts
   
   Board configuration scripts can be found here: <https://github.com/linux-sunxi/sunxi-boards/blob/master/sys_config>. You can compile them with the "fex2bin" tool found here: <https://github.com/linux-sunxi/sunxi-tools>.
   
   To use, copy the compiled FEX to your MS-DOS partition, load it with U-Boot, and then tell the kernel where to find it with the "sysconfig=" boot option. For example, uEnv.txt on a Cubieboard2 might look like this:
   
   [[!template  id=programlisting text="""
   bootargs=root=ld0a sysconfig=0x43000000
   uenvcmd=mmc dev 0; mmc rescan; fatload mmc 0:1 43000000 cubieboard2.bin; fatload mmc 0:1 82000000 netbsd.ub; bootm 82000000
   """]]
   
   Some pre-compiled .bin files can be found here: <http://ftp.netbsd.org/pub/NetBSD/misc/jmcneill/allwinner/fex/>
   
   # Framebuffer console
   
   To use HDMI for the console device, add *console=fb* to bootargs in uEnv.txt.
   
   If the connected display does not let you disable overscan, you can add a margin to the framebuffer by with the *fb.margin* bootargs option. For example, to set a 25-pixel margin around the screen, add *fb.margin=25* to uEnv.txt
   
   # HDMI audio
   
   The default audio device is the analog audio codec. To change the default device, use the *audiocfg* command:
   
   [[!template  id=programlisting text="""
   a31# audiocfg list
   0: [*] audio0 @ awinac0: Allwinner CODEC A31, 2 playback channels
   1: [ ] audio1 @ awinhdmiaudio0: Allwinner HDMI 1.4, 2 playback channels
   a31# audiocfg default 1
   setting default audio device to audio1
   a31# audiocfg list
   0: [ ] audio0 @ awinac0: Allwinner CODEC A31, 2 playback channels
   1: [*] audio1 @ awinhdmiaudio0: Allwinner HDMI 1.4, 2 playback channels
   """]]
   
   # Board specific notes
   
   ## Merrii Hummingbird A31
   
   There doesn't appear to be a meaningful way to generate a MAC address on these boards. U-Boot from the A31 SDK and from the u-boot-sunxi tree both lack GMAC support, and the Security ID registers (at 0x01c23800) appear to be empty.
   
   To overcome this, you can specify your own MAC address in *uEnv.txt*:
   [[!template  id=programlisting text="""
   bootargs=root=ld0a awge0.mac-address=02:a0:3d:88:1a:1e
   """]]
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