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web commit by jmcneill: Mention options for dealing with overscan.

    1: [[!meta title="NetBSD/evbarm on Allwinner Technology SoCs"]]
    2: 
    3: [[!toc levels=2]]
    4: 
    5: # Supported boards
    6:  - [Banana Pi](http://www.bananapi.org/p/product.html) (BPI)
    7:  - Cubieboard, Cubieboard 2 (CUBIEBOARD)
    8:  - Cubietruck (CUBIETRUCK)
    9:  - [Merrii Hummingbird A31](http://www.merrii.com/en/pla_d.asp?id=172) (HUMMINGBIRD_A31)
   10: 
   11: # Supported hardware
   12:  - SoCs
   13:    - Cortex-A8: A10
   14:    - Cortex-A7: A20 (2-core), A31 (4-core)
   15:  - SD/MMC controller (DMA)
   16:  - DMA controller
   17:  - GPIO
   18:    - Configuration using FEX scripts is supported
   19:  - UART
   20:  - I2C
   21:  - P2WI (A31)
   22:  - PMU
   23:    - AXP209 (A20)
   24:    - AXP221 (A31)
   25:  - Watchdog timer
   26:  - RTC
   27:  - Audio codec
   28:  - USB host
   29:    - OHCI
   30:    - EHCI
   31:    - OTG (not yet working on A31)
   32:  - SATA (A10/A20)
   33:  - Gigabit Ethernet (GMAC)
   34:  - HDMI (A20/A31)
   35:    - DDC / EDID mode detection
   36:    - Audio support
   37:  - Framebuffer
   38: 
   39: # TODO
   40:  - OTG (A31)
   41:  - USB device mode
   42:  - Bluetooth / WiFi (Cubietruck, Hummingbird A31)
   43:  - 3G (Hummingbird A31)
   44:  - SD/MMC UHS-I support (needs sdmmc(4) changes)
   45:  - TV input (Hummingbird A31)
   46:  - NAND
   47:  - Fast Ethernet (EMAC)
   48:  - IR
   49: 
   50: # Installation
   51: 
   52: ## A10 / A20 based boards
   53: 
   54: * Start with an ARMv7 image from *evbarm-earmv7hf/binary/gzimg/* such as *beaglebone.img*
   55: * 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/>
   56: * Write the *u-boot-sunxi-with-spl.bin* loader to the base image:
   57: [[!template  id=programlisting text="""
   58: # dd if=u-boot-sunxi-with-spl.bin of=beaglebone.img bs=1k seek=8 conv=notrunc
   59: """]]
   60: * Write the image to an SD card.
   61: * Copy the kernel (netbsd.ub) for your board to the root of the MS-DOS partition.
   62: * Create or edit uEnv.txt on the MS-DOS partition:
   63: [[!template  id=programlisting text="""
   64: bootargs=root=ld0a
   65: uenvcmd=mmc dev 0; mmc rescan; fatload mmc 0:1 82000000 netbsd.ub; bootm 82000000
   66: """]]
   67: 
   68: ## A31 based boards
   69: 
   70: TBD.
   71: 
   72: # Big (endian) fun
   73: 
   74: You can run this boards with a little endian (this is the default and implied by above install instructions)
   75: or with a big endian kernel and userland. However, kernel and userland endianness needs to match.
   76: 
   77: To build a big endian release (or sets) use 
   78: [[!template  id=programlisting text="""
   79: ./build.sh -m evbearmv7hf-eb 
   80: """]]
   81: 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.
   82: 
   83: # FEX scripts
   84: 
   85: 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>.
   86: 
   87: 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:
   88: 
   89: [[!template  id=programlisting text="""
   90: bootargs=root=ld0a sysconfig=0x43000000
   91: uenvcmd=mmc dev 0; mmc rescan; fatload mmc 0:1 43000000 cubieboard2.bin; fatload mmc 0:1 82000000 netbsd.ub; bootm 82000000
   92: """]]
   93: 
   94: Some pre-compiled .bin files can be found here: <http://ftp.netbsd.org/pub/NetBSD/misc/jmcneill/allwinner/fex/>
   95: 
   96: # Framebuffer console
   97: 
   98: To use HDMI for the console device, add *console=fb* to bootargs in uEnv.txt.
   99: 
  100: 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
  101: 
  102: # HDMI audio
  103: 
  104: The default audio device is the analog audio codec. To change the default device, use the *audiocfg* command:
  105: 
  106: [[!template  id=programlisting text="""
  107: a31# audiocfg list
  108: 0: [*] audio0 @ awinac0: Allwinner CODEC A31, 2 playback channels
  109: 1: [ ] audio1 @ awinhdmiaudio0: Allwinner HDMI 1.4, 2 playback channels
  110: a31# audiocfg default 1
  111: setting default audio device to audio1
  112: a31# audiocfg list
  113: 0: [ ] audio0 @ awinac0: Allwinner CODEC A31, 2 playback channels
  114: 1: [*] audio1 @ awinhdmiaudio0: Allwinner HDMI 1.4, 2 playback channels
  115: """]]
  116: 
  117: # Board specific notes
  118: 
  119: ## Merrii Hummingbird A31
  120: 
  121: 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.
  122: 
  123: To overcome this, you can specify your own MAC address in *uEnv.txt*:
  124: [[!template  id=programlisting text="""
  125: bootargs=root=ld0a awge0.mac-address=02:a0:3d:88:1a:1e
  126: """]]