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version 1.18, 2014/10/20 16:17:49 version 1.50, 2015/04/02 18:36:59
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 [[!meta title="NetBSD/evbarm on Allwinner Technology SoCs"]]  [[!meta title="NetBSD/evbarm on Allwinner Technology SoCs"]]
   
   NetBSD 7.0 has support for A10, A20, and A31 SoCs. NetBSD -current adds support for A80 SoCs.
   
 [[!toc levels=2]]  [[!toc levels=2]]
   
 # Supported boards  # Supported boards
  - [Banana Pi](http://www.bananapi.org/p/product.html) (BPI)   - [Banana Pi](http://www.bananapi.org/p/product.html) (BPI)
  - Cubieboard, Cubieboard 2 (CUBIEBOARD)   - Cubieboard 2 (CUBIEBOARD)
    - [Cubieboard 4](http://cubieboard.org/model/cb4/) (ALLWINNER_A80) *NetBSD-current*
  - Cubietruck (CUBIETRUCK)   - Cubietruck (CUBIETRUCK)
  - [Merrii Hummingbird A31](http://www.merrii.com/en/pla_d.asp?id=172) (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     - Cortex-A7/A15: A80 (4-core A7 + 4-core A15)
  - SD/MMC controller (DMA)   - 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
      - A80: AC100
    - Audio codec (A20/A31)
  - USB host   - USB host
    - OHCI     - OHCI
    - EHCI     - EHCI
    - OTG (not yet working on A31)     - OTG (A20)
  - SATA (A10/A20)   - SATA (A10/A20)
  - Gigabit Ethernet (GMAC)   - Gigabit Ethernet (GMAC)
    - HDMI
      - DDC / EDID mode detection (A20/A31)
      - Audio support (A20/A31)
    - Framebuffer (A20/A31/A80)
    - IR receiver (A20/A31/A80)
   
 # TODO  # TODO
  - MULTIPROCESSOR is not yet stable   - A10
  - HDMI (some work completed here for A20)     - Interrupt controller
  - Framebuffer     - EMAC
  - OTG (A31)   - A31
  - USB device mode     - OTG
  - Bluetooth / WiFi (Cubietruck, Hummingbird A31)     - IR transmitter
  - 3G (Hummingbird A31)     - 3G module
  - SD/MMC UHS-I support (needs sdmmc(4) changes)     - TV input
  - TV input (Hummingbird A31)   - A80
  - NAND     - MP
      - big.LITTLE support
      - USB3 (OTG and XHCI)
      - IR transmitter
      - HDMI (DDC and mode setting; currently relies on U-Boot for setup)
      - Audio codec
    - All
      - USB device mode
      - SD/MMC UHS-I support (needs sdmmc(4) changes)
      - SDIO (Bluetooth / WiFi)
      - NAND
      - VGA (Cubietruck, Hummingbird A31, Cubieboard4)
   
 # Installation  # Installation
   
 ## A10 / A20 based boards  ## A10 / A20 / A31 based boards
   
 * Start with an ARMv7 image from *evbarm-earmv7hf/binary/gzimg/* 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
 * Write the *u-boot-sunxi-with-spl.bin* loader to the base image:    * Download the correct build from the linux-sunxi web site <http://dl.linux-sunxi.org/nightly/u-boot-sunxi/u-boot-sunxi-mainline/u-boot-sunxi-mainline-latest/>.
   * Write the *u-boot-sunxi-with-spl.bin* loader to the empty space at the start of 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 MS-DOS partition.  * Copy the kernel (netbsd.ub) for your board to the root of the MS-DOS partition on the SD card.
 * Create or edit uEnv.txt on the MS-DOS 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
   
 TBD.  * Cubieboard 4 U-Boot for SD card: <http://ftp.netbsd.org/pub/NetBSD/misc/jmcneill/allwinner/a80/cubieboard4-uboot.tgz>
   [[!template  id=programlisting text="""
   # dd if=u-boot-spl.bin of=/dev/sdd bs=1k seek=8
   # dd if=u-boot-sun9iw1p1.bin of=/dev/sdd bs=1k seek=19096
   """]]
   * First partition needs to be at +20MB offset. Format it as MSDOS, copy 'netbsd.ub' to it as 'uImage'.
   
 # Big (endian) fun  # Big (endian) fun
   
Line 76  To build a big endian release (or sets)  Line 106  To build a big endian release (or sets) 
 """]]  """]]
 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.  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.
   
 # Board specific notes  # 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
   
 ## Merrii Hummingbird A31  # 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
   """]]
   
 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.  # MAC address
   
 To overcome this, you can specify your own MAC address in *uEnv.txt*:  On boards where the ethernet MAC address cannot be determmined, a random MAC address will be generated every boot. You can override this behaviour by specifying a MAC address in *uEnv.txt*:
 [[!template  id=programlisting text="""  [[!template  id=programlisting text="""
 bootargs=root=ld0a awge0.mac-address=02:a0:3d:88:1a:1e  bootargs=root=ld0a awge0.mac-address=02:a0:3d:88:1a:1e
 """]]  """]]
Removed from v.1.18  
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  Added in v.1.50

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