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Reading/Writing FW of 'Miracast' [1] and similar machines.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1) Obtain a ~straight~ (not 'Y') usb cable that fits your unit.
2) While pressing and holding the button on the unit, plug in
   the usb cable.
3) Miracast will enumerate! Mine is 2207:292a. If yours differs,
   change the magic constant in the included patch.
4) If you have the serial cable, you will see something like this
   in your terminal:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
DDR Version 1.04 20130517
In
DDR3
300MHz
Bus Width=16 Col=10 Bank=8 Row=14 CS=1 Die Bus-Width=16 Size=256MB
Memory OK
OUT
BUILD=====7
SdmmcInit=0 20
emmc reset for reinit
emmc reset for reinit
SdmmcInit=2 20
Spi_ChipId = ef4019
magic = fcdc8c3b
OK! 93079
unsigned!
no sys part.
SecureBootEn = 0 0
Boot ver: 2013-09-06#1.38
RECOVERY key is pressed
UsbBoot,130415
UsbHook,783970
powerOn,783993
 942841 UsbConnected
 1096003 UsbConnected
 1206284 UsbConnected
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Note that you do not actually need the terminal to read and write
the EEPROM! But ~testing~ a new firmware without the serial cable
will prove very painful - just as with Pogo. Warm up the soldering
iron and attach the cable!

5) Keep in mind that all units given to 'rkflashtool' are in blocks
   (512 byte). E.g.,

   ./rkflashtool r 0x00 0x680

   extracts the boot partition.

6) See rkflashtool.c for how to write fw and reboot the machine
   (convenient.)


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[1] http://log.bitcoin-assets.com/?date=20-07-2015#1207435
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