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web commit by jmcneill: Link to pre-build U-Boot binaries

[[!meta title="NetBSD/evbarm on Hardkernel ODROID-C1"]]

[[!toc levels=2]]

# Supported hardware
 - CPU: Cortex-A5: S805 (4-core) at 1.5GHz
   - CPU frequency scaling is supported with machdep.cpu sysctl tree
   - SMP supported
   - PL310 L2 cache controller
 - GIC
 - A5 watchdog timer
 - A5 global timer
 - SD/MMC controller (DMA)
 - Serial console
 - USB host (OTG)
 - Gigabit Ethernet (GMAC)
   - RTL8211F PHY
 - Hardware random number generator

# TODO
 - USB device mode
 - Simultaneous SD card and eMMC usage
 - SD/MMC UHS-I support (needs sdmmc(4) changes)
 - HDMI / framebuffer
 - IR receiver
 - GPIO
 - I2C

# Installation

* Start with an ARMv7 image from *evbarm-earmv7hf/binary/gzimg/* such as *beagleboard.img*
* Build U-Boot for ODROID-C1 <https://github.com/hardkernel/u-boot/tree/odroidc-v2011.03>
  * Pre-built binaries here: <http://ftp.netbsd.org/pub/NetBSD/misc/jmcneill/odroidc1/u-boot-odroidc-v2011.03-20150308.tar.gz>
* Write the bootloader to the empty space at the start of the base image:
[[!template  id=programlisting text="""
# dd if=bl1.bin.hardkernel of=beagleboard.img bs=1 count=442 conv=notrunc
# dd if=bl1.bin.hardkernel of=beagleboard.img bs=512 skip=1 seek=1 conv=notrunc
# dd if=u-boot.bin of=beagleboard.img bs=512 seek=64 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 boot.ini on the MS-DOS partition:
[[!template  id=programlisting text="""
ODROIDC-UBOOT-CONFIG

setenv m "1080p"
setenv vout_mode "hdmi"
setenv m_bpp "32"
setenv disableuhs "disableuhs"
setenv bootargs "root=ld0a awge0.mac-address=${ethaddr}"
setenv bootcmd "fatload mmc 0:1 0x21000000 netbsd.ub; bootm 0x21000000"
run bootcmd
"""]]


# ODROID-C1 UART pins

From [ODROID Forum](http://forum.odroid.com/viewtopic.php?f=115&t=7684):

[[!template  id=programlisting text="""
 ___UART____
|Pin 4 - GND|
|Pin 3 - RXD|
|Pin 2 - TXD|
|Pin 1 - VCC|
\___________|

3.3V LVTTL
"""]]