Difference between revisions of "Logitech Revue Technical"

From Exploitee.rs
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(Serial Output)
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[http://i.imgur.com/xJHay.jpg UART Pinout]
 
[http://i.imgur.com/xJHay.jpg UART Pinout]
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Serial output
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via: http://googletv.pastebin.com/233dZqZx
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[[GoogleTV Pastebin]]
  
 
== PIC Access ==
 
== PIC Access ==

Revision as of 02:05, 29 December 2010

Specs

  • Intel Atom CE4150 1.2 GHz processor, with a 400 MHz GPU
  • Gigabyte GA-SBKAN2 motherboard
  • Samsung K9F8G08U0M 1 GB NAND Flash (RAM)
  • Hynix H27UBG8T2ATR 4 GB NAND Flash (Long Term Storage)
  • Silicon Image Sil9135 HDMI 1.3 Receiver
  • Nanya NT5CB128M8CN-CG 1 GB DDR3 SDRAM (1 Gb X 8)
  • Realtek Semiconductor RTL8201N 10/100M PHYceiver
  • Microchip PIC24FJ64GA004-I/PT 16-bit microcontroller

The Logitech Revue was recently torndown and its inners revealed.

Usage

Samsung K9F8G08U0M 1 GB NAND Flash

  • Used for storage of bootloader, kernel, boot flash graphics, Linux OS etc..

Hynix H27UBG8T2ATR 4 GB NAND Flash (Long Term Storage)

  • Used for persistent storage, device is /dev/sda - possible to override with an external USB drive

Microchip PIC24FJ64GA004-I/PT 16-bit microcontroller

  • Used to handle IR input/output for remotes/IR blasters and possible interface with wireless keyboard

Update Procedure

Place new update labeled "update.zip" on a USB drive, with a single partition (ie, 1st partition on a USB disk, so say "/dev/sdc1")

Insert into Revue in the Right most USB port (if looking at the back, closest to the power jack)

Boot into recovery mode: (confirm?)

Hold the Sync button while plugging in the Revue, keep it held, at the same time hold Menu+L on the keyboard.

Box will reboot, continue to hold Sync button, then hold Alt+L (or mash, your choice), and it should then enter recovery mode.

You can then update the box, with a newer update. Downgrading fails however due to a date check.


Firmware Links

http://android.clients.google.com/packages/ota/logitech_ka/439c26f6af05.mp-signed-ota_update-b39389.zip

http://android.clients.google.com/packages/ota/logitech_ka/52057d168e2b.mp-signed-ota_update-b39953.zip

http://android.clients.google.com/packages/ota/logitech_ka/c9914396d183.mp-signed-ota_update-b42449.zip

(Add update history?)

Flash Layout

via: http://googletv.pastebin.com/233dZqZx GoogleTV Pastebin

Creating 13 MTD partitions on "intel_ce_nand":

  • 0x00000000-0x00200000 : "mbr"
  • 0x00200000-0x00a00000 : "cefdk"
  • 0x00a00000-0x00c00000 : "redboot"
  • 0x00c00000-0x00e00000 : "cefdk-config"
  • 0x01000000-0x01800000 : "splash"
  • 0x01800000-0x01900000 : "fts"
  • 0x01900000-0x02d00000 : "recovery"
  • 0x02d00000-0x03200000 : "kernel"
  • 0x03200000-0x07200000 : "boot"
  • 0x07200000-0x1f200000 : "system"
  • 0x1f200000-0x3fa00000 : "data"
  • 0x3fa00000-0x3ff00000 : "keystore"
  • 0x3ff00000-0x40000000 : "bbt"

mbr - Master Boot Record

cefdk - Boot loader, may or may not have a shell

Splash - Splash image, can be seen here ( http://img413.imageshack.us/img413/3144/splashc.png )

Recovery - Full image, including kernel and small ramdisk (in squashfs format), boots to recovery menu

Kernel - The kernel image

Boot - Ramdisk for the actual box, goes in hand with the kernel image, also in squashfs format

Serial Output

The logitech revue board contains a UART1 port on the front of the board which before receiving the boxes initial updates is active. In order to communicate with UART port you will need a USB to TTL adapter (or board that does a similar conversion).

The pins operate at 3.3v and the port at 9600 baud with the following pinout:

UART Pinout

Serial output

via: http://googletv.pastebin.com/233dZqZx GoogleTV Pastebin

PIC Access

There is a standard PIC access port to the right of the UART1 port. It can be accessed via a standard PIC Kit Debug board (Tested with version 2). The port has read/write access but the code is pulled from the chip as .hex file and is unreadable thus far.

PIC Hex Dump