PatchJLW01 provides the necessary changes to the FreeBSD 11.0-CURRENT r278021
source tree which along with the additional source code accompanying this file
allows FreeBSD to be built for various Amlogic ARM based SoC devices.

Currently FreeBSD successfully boots to the login prompt on an aml8726-m6
board (the box seems to be some type of Visson ATV-102) as well as on an
aml8726-m8b board (a Hardkernel ODROID-C1) using a SD card and a serial
console.

The following support is included:

  Basic machdep code

  SMP

  Interrupt controller

  Clock clock (aka gate)

  Pinctrl

  Timer

  Real time clock

  UART

  GPIO

  I2C

  SD controller

  SDXC controller

  USB

  Watchdog

  Random number generator

  PLL / Clock frequency measurement

  Frame buffer

The MAC appears to be the DWC ... it shows signs of life, however needs
additional work to support the Amlogic platform.

The u-boot sequence I use for the Visson ATV-102 is:

  video dev open 480p
  mmc rescan 0
  fatload mmc 0 0x80100000 kernel.bin
  go 0x80100000

The u-boot sequence I use for the Hardkernel ODROID-C1 is:

  video dev open 480p
  fatload mmc 0 0x100000 kernel.bin
  go 0x100000

The current FreeBSD driver doesn't program the video clocks so the u-boot
video commands are necessary in order for the frame buffer to be useful
(otherwise they can be skipped).

The SD card for the Visson ATV-102 doesn't need anything special beyond
creating a FAT16 and a UFS filesystem.

The SD card for the ODROID-C1 also needs to contain the Hardkernel bootloader
as well as u-boot ... sd_freebsd_odroidc1.sh can be used to prep the card.
I obtained the bootloader and u-boot from the boot subdirectory of
ArchLinuxARM-odroid-c1-latest.tar.gz which is available at:

  http://archlinuxarm.org/developers/downloads

The u-boot source code is available at:

  https://github.com/hardkernel/u-boot/tree/odroidc-v2011.03/

which also contains a prebuilt bootloader in the sd_fuse subdirectory ...
however currently there's no prebuilt u-boot present.

The frame buffer driver is very rudimentary.

The Pinctrl driver contains just a basic set of entries ... additional
pins can be added as necessary.

The RTC on the ODROID-C1 requires the battery to be installed.

The SDXC driver works fine when controlling a SD card, it also seems
talk to the eMMC on the ODROID-C1, however more work is necessary
(some possibly at the MMC driver level) in order to support eMMC.

Enjoy,

John Wehle
john@feith.com