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[[!meta title="NetBSD/evbarm on Allwinner Technology SoCs"]]

[[!toc levels=2]]

# Supported boards
 - [Banana Pi]( (BPI)
 - Cubieboard 2 (CUBIEBOARD)
 - [Cubieboard 4]( (ALLWINNER_A80) *NetBSD-current*
 - Cubietruck (CUBIETRUCK)
 - [Merrii Hummingbird A31]( (HUMMINGBIRD_A31)

# Supported hardware
 - SoCs
   - Cortex-A7: A20 (2-core), A31 (4-core), A80
   - Cortex-A7/A15: A80 (4-core A7 + 4-core A15)
 - SD/MMC controller (DMA)
 - DMA controller
   - Configuration using FEX scripts is supported
 - I2C
 - P2WI (A31) / RSB (A80)
 - PMU
   - AXP209 (A20)
   - AXP221 (A31)
   - AXP806 (A80)
   - AXP809 (A80)
 - Watchdog timer
 - RTC
   - A20/A31: integrated RTC, PCF8563
   - A80: AC100
 - Audio codec (A20/A31)
 - USB host
   - OHCI
   - EHCI
   - OTG (A20)
 - SATA (A10/A20)
 - Gigabit Ethernet (GMAC)
 - HDMI (A20/A31)
   - DDC / EDID mode detection
   - Audio support
 - Framebuffer (A20/A31)
 - IR receiver (A20/A31/A80)

 - A10
   - Interrupt controller
   - EMAC
 - A31
   - OTG
   - IR transmitter
   - 3G module
   - TV input
 - A80
   - MP
   - big.LITTLE support
   - USB3 (OTG and XHCI)
   - IR transmitter
   - HDMI
   - 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

## A10 / A20 / A31 based boards

* Start with an ARMv7 image from *evbarm-earmv7hf/binary/gzimg/* such as *beagleboard.img*
* Download a U-Boot build for your board
  * A10/A20: Download from the linux-sunxi web site <>
  * A31: The standard u-boot-sunxi tree doesn't support A31 yet. Until sun6i support is merged, a build is available at <> 
* Write the *u-boot-sunxi-with-spl.bin* loader to the empty space at the start of the base image:
[[!template  id=programlisting text="""
# dd if=u-boot-sunxi-with-spl.bin of=beagleboard.img bs=1k seek=8 conv=notrunc
* Write the image to an SD card.
* 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:
[[!template  id=programlisting text="""
uenvcmd=mmc dev 0; mmc rescan; fatload mmc 0:1 82000000 netbsd.ub; bootm 82000000

## A80 based boards

* Cubieboard 4 SDK (lubuntu) U-Boot env:
[[!template  id=programlisting text="""
boot_normal=fatload mmc 0:1 20007800 uimage;bootm 20007800
bootcmd=run setargs_cubie boot_normal
setargs_cubie=setenv bootargs console=${console1} console=${console} root=${mmc_root} loglevel=${loglevel}

# Big (endian) fun

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="""
./ -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: <>. You can compile them with the "fex2bin" tool found here: <>.

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: <>

# 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

# MAC address

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="""
bootargs=root=ld0a awge0.mac-address=02:a0:3d:88:1a:1e

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