x86: Add Intel Edison board files

Add Intel Edison board which is using U-Boot.

The patch is based on work done by the following people (in alphabetical
order):
	Aiden Park <aiden.park@intel.com>
	Dukjoon Jeon <dukjoon.jeon@intel.com>
	eric.park <eric.park@intel.com>
	Fabien Chereau <fabien.chereau@intel.com>
	Felipe Balbi <felipe.balbi@linux.intel.com>
	Scott D Phillips <scott.d.phillips@intel.com>
	Sebastien Colleur <sebastienx.colleur@intel.com>
	Steve Sakoman <steve.sakoman@intel.com>
	Vincent Tinelli <vincent.tinelli@intel.com>

In case we're building for Intel Edison, we must have 4096 bytes of
zeroes in the beginning on u-boot.bin. This is done in
board/intel/edison/config.mk.

First run sets hardware_id environment variable which is read from
System Controller Unit (SCU).

Serial number (serial# environment variable) is generated based on eMMC
CID.

MAC address on USB network interface is unique to the board but kept the
same all over the time.

Set mac address from U-Boot using following scheme:
	OUI = 02:00:86
	next 3 bytes of MAC address set from eMMC serial number

This allows to have a unique mac address across reboot and flashing.

Signed-off-by: Vincent Tinelli <vincent.tinelli@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
[bmeng: Add MAINTAINERS file for Intel Edison board]
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/doc/README.x86 b/doc/README.x86
index c69dc1c5113..8025485cf13 100644
--- a/doc/README.x86
+++ b/doc/README.x86
@@ -18,6 +18,8 @@ U-Boot supports running as a coreboot [1] payload on x86. So far only Link
 work with minimal adjustments on other x86 boards since coreboot deals with
 most of the low-level details.
 
+U-Boot is a main bootloader on Intel Edison board.
+
 U-Boot also supports booting directly from x86 reset vector, without coreboot.
 In this case, known as bare mode, from the fact that it runs on the
 'bare metal', U-Boot acts like a BIOS replacement. The following platforms
@@ -61,6 +63,16 @@ Change the 'Board configuration file' and 'Board Device Tree Source (dts) file'
 to point to a new board. You can also change the Cache-As-RAM (CAR) related
 settings here if the default values do not fit your new board.
 
+Build Instructions for U-Boot as main bootloader
+------------------------------------------------
+
+Intel Edison instructions:
+
+Simple you can build U-Boot and obtain u-boot.bin
+
+$ make edison_defconfig
+$ make all
+
 Build Instructions for U-Boot as BIOS replacement (bare mode)
 -------------------------------------------------------------
 Building a ROM version of U-Boot (hereafter referred to as u-boot.rom) is a
@@ -455,6 +467,33 @@ Here the kernel (bzImage) is loaded to 01000000 and initrd is to 04000000. Then,
 
 => zboot 01000000 - 04000000 1b1ab50
 
+Updating U-Boot on Edison
+-------------------------
+By default Intel Edison boards are shipped with preinstalled heavily
+patched U-Boot v2014.04. Though it supports DFU which we may be able to
+use.
+
+1. Prepare u-boot.bin as described in chapter above. You still need one
+more step (if and only if you have original U-Boot), i.e. run the
+following command:
+
+$ truncate -s %4096 u-boot.bin
+
+2. Run your board and interrupt booting to U-Boot console. In the console
+call:
+
+ => run do_force_flash_os
+
+3. Wait for few seconds, it will prepare environment variable and runs
+DFU. Run DFU command from the host system:
+
+$ dfu-util -v -d 8087:0a99 --alt u-boot0 -D u-boot.bin
+
+4. Return to U-Boot console and following hint. i.e. push Ctrl+C, and
+reset the board:
+
+ => reset
+
 CPU Microcode
 -------------
 Modern CPUs usually require a special bit stream called microcode [8] to be