BT HomeHub 2.0 Type B

Black boxes given away with a bt broadband subscription. It comes in two versions Type A and Type B. The two versions look identical, and although they provide similar functionality, they are quite different on the inside.

Type A is made by Thomson, and is broadcom based, using Thomson linux based firmware. Type B is made by SHC (Siemens), and is Infineon/Lantiq Danube based, using OpenRG based linux firmware. Bootloader is u-boot.

The homehub V2 includes ADSL2+, 802.11b/g/n wireless, host USB port, 4 wired ethernet ports, DECT, FXS & FXO ports and VOIP functionality.

The firmware of both units can be successfully hacked for use on other ISPs (see www.psidoc.com). The Type A firmware is a litlte more flexible than the Type B firmware in terms of what can be done after gaining access. However, the Type B can be made to work with OpenWRT.

Supported Versions

Version/Model Launch Date S/N OpenWrt Version Supported Model Specific Notes
Type A - ? -
Type B - Barrier Breaker -

Attitude Adjustment contains a profile for the Type B, but support is incomplete. Unofficial patches do however exist to build a working image. A community build using these patches is also available, of trunk version 34686 (ie a snapshot shortly before the Attitude Adjustment release). See below for details.

Barrier Breaker contains full support for router/modem functionality on the Type B. Telephony (DECT and FXO/FXS) is not supported.

Hardware Highlights

CPU Ram Flash Ethernet USB Wireless Serial JTag VOIP FXS
Lantiq Danube@333MHz 64MB 32MB NAND+512k NOR 4 Yes 11ng Yes Yes yes yes

Installation

These instructions assume you have already unblocked your Home Hub 2B, have updated uboot and have access to the uboot console. If you have not yet done this, see next section.

The main main flash memory on the Home Hub 2B is nand, not nor, As a result, a squashfs/ubifs overlay is used instead of the standard squashfs/jffs2 overlay image used on most other routers, Similarly, a ubifs image is used instead of a jffs2 image. Also, there are two separate files to flashed, on for the kernel, the other for the (ubinized) root filesytem.

You will need the following files:

openwrt-lantiq-xway-BTHOMEHUBV2B-uImage (kernel image to install)

openwrt-lantiq-xway-BTHOMEHUBV2B-uImage-initramfs (initramfs image, used only during the installation process)

plus one of the following root filesystem images:

openwrt-lantiq-xway-BTHOMEHUBV2B-squashfs-ubinized.bin (squashfs/ubifs overlay)

openwrt-lantiq-xway-BTHOMEHUBV2B-ubifs-ubinized.bin (ubifs)

The following instructions assume you are using the overlay image. Simply replace openwrt-lantiq-xway-BTHOMEHUBV2B-squashfs-ubinized.bin with openwrt-lantiq-xway-BTHOMEHUBV2B-ubifs-ubinized.bin if you prefer to use the pure ubifs image.

Copy kernel images to your tftpboot folder:

  cp openwrt-lantiq-xway-BTHOMEHUBV2B-uImage-initramfs /var/lib/tftpboot/
  cp openwrt-lantiq-xway-BTHOMEHUBV2B-uImage /var/lib/tftpboot/

From the uboot prompt on the Home Hub:

  tftpboot 81000000 openwrt-lantiq-xway-BTHOMEHUBV2B-uImage
  nand erase 0x004000 0x1ffC000
  nand write 81000000 0x004000 0x160000

DO NOT BOOT THIS IMAGE YET! Instead, load the ramdisk image and boot that:

  tftpboot 81000000 openwrt-lantiq-xway-BTHOMEHUBV2B-uImage-initramfs
  bootm 81000000

VERY IMPORTANT! The above lines are only for the very first time that you install a ubi-enabled image. On subsequent occasions you should not erase the whole nand, only the kernel partition, otherwise wear leveling data for the ubi partition will be lost. So for subsequent installs the above five lines become:

  tftpboot 81000000 openwrt-lantiq-xway-BTHOMEHUBV2B-uImage
  nand erase 0x004000 0x160000
  nand write 81000000 0x004000 0x160000
  tftpboot 81000000 openwrt-lantiq-xway-BTHOMEHUBV2B-uImage-initramfs
  bootm 81000000

Now log in to a console on the Home Hub, make sure that the dropbearkey process has finished running and enable ssh by setting a root password.

From the PC, copy the ubinized root filesystem image to the Home Hub:

  scp openwrt-lantiq-xway-BTHOMEHUBV2B-squashfs-ubinized.bin root@192.168.1.1:/tmp

On the Home Hub, format the ubi partition using the ubi image just copied:

  ubidetach -p /dev/mtd7
  ubiformat /dev/mtd7 -f /tmp/openwrt-lantiq-xway-BTHOMEHUBV2B-squashfs-ubinized.bin
  reboot

At this point cross your fingers and hope that everything works!!!

Support and Links

Following the sad closure of http://psidoc.com, the best source of support is probably http://openwrt.ebilan.co.uk.

Instructions on how to obtain access to the bootloader can be found here: http://openwrt.ebilan.co.uk/viewtopic.php?f=11&t=6

Unofficial patches and a community build based on them can be found here: http://openwrt.ebilan.co.uk/viewtopic.php?f=4&t=3

For reference, the initial work done to get OpenWRT running on the Home Hub 2B is available here:

http://sourceforge.net/projects/hh2b4ever/

https://sourceforge.net/p/hh2b4ever/code/ci/7c17843ab0596dccb2bd972ed9df6c4ccd9995a8/tree/

Firmware

NAND Flash Layout

NAND - 32 Mbytes:
0x00000000-0x00004000 : "Atheros EEPROM"
0x00004000-0x00E04000 : "OpenRG Image 1"
0x00E04000-0x00F00000 : ? (empty)
0x00F00000-0x01D00000 : "OpenRG Image 2 (empty)"
0x01D00000-0x01E00000 : ? (empty)
0x01E00000-0x02000000 : "Dect configuration? (empty)"

NOR Flash Layout

NOR - 512k:
0x00000000-0x00040000 : first u-boot
0x00040000-0x00050000 : u-boot stored config
0x00050000-0x00060000 : RG conf 1 16k
0x00060000-0x00070000 : RG conf 2 16k
0x00070000-0x00080000 : RG factory conf 16k

Flash Details

NOR: PHYS_FLASH_1 0xB0000000 16 bit in EBU region 0 NAND: PHYS_FLASH_2 0xB4000000 Sector size 256 nand max floors 1 nand max chips 1 in EBU region 1

Hardware

Info

Architecture: MIPS
Vendor: Lantiq
Bootloader: U-Boot
System-On-Chip: Lantiq Danube PSB-S 50712 (MIPS 24Kec)
CPU/Speed: 333 MHz Dual Core
NOR Flash: Spansion S29AL004D 4MiB
NAND Flash: Samsung K9F5608U0D-JIB0 32MiB
RAM Chip: Samsung K4H511638F
RAM Specs: 64 MiB
Wireless: Atheros 9160-BC1A 802.11b/g/n, pci, 0x18000000, irq 22
Ethernet: Infineon AD9669I
USB: Yes
DECT: SiTel SC14488
Slic: Teridian 73m1966, Infineon Vinetic PEF4268F 'Ringing SLIC with Integrated DC/DC Converter'
Serial: Yes
JTAG: ?

Photos

Serial

In the photos above, wires are soldered on to the 3.3v serial lines.

The connections are:

Top GND
Middle Rx
Bottom Tx

Note that the original u-boot has 'silent' mode enabled

GPIOs

The CPU has 2 x 16 possible GPIO pins.
For each pin there are control bits:
DIR: direction (0=input, 1=output)
IN/OUT: value read from/written to pin
ALTSEL0/ALTSEL1: function multiplexed to the pin (see pinctrl driver)
OD: 0=open drain, 1='normal mode' push-pull
PUDSEL: pullup/down select (1=up)
PUDEN: pullup/down enable (1=enabled)

uboot initial values

bit dir out altsel0 altsel1 od pudsel puden usage
- 70 FF 73 01 FF 00 00 -
GPIO-00 0 in 1 1 1 1 0 0
GPIO-01 0 in 1 1 0 1 0 0 FXO Interrupt
GPIO-02 0 in 1 0 0 1 0 0 Reset button
GPIO-03 1 out 1 0 0 1 0 0 CLK-OUT2 - (25mhz for amd9669i? - danube_clock.c in u-boot)
GPIO-04 1 out 1 1 0 1 0 0 - stp-st (maybe also likely boot clock select 1 = 36mhz)
GPIO-05 1 out 1 1 0 1 0 0 - stp-d
GPIO-06 1 out 1 1 0 1 0 0 - stp-sh
GPIO-07 0 in 1 0 0 1 0 0 -
name dir out altsel0 altsel1 od pudsel puden usage
- 26 FB 38 02 77 48 48 -
GPIO-08 0 in 1 0 0 1 0 0
GPIO-09 1 out 1 0 1 1 0 0 - FXO Chip Select
GPIO-10 1 out 0 0 0 1 0 0 - FXO reset
GPIO-11 0 in 1 1 0 0 1 1 - pulled up
GPIO-12 0 in 1 1 0 1 0 0
GPIO-13 1 out 1 1 0 1 0 0 - USB Power
GPIO-14 0 in 1 0 0 1 1 1 -
GPIO-15 0 in 1 0 0 0 0 0 - find handset button
name dir out altsel0 altsel1 od pudsel puden usage
- BE D7 87 00 FC 50 50 -
GPIO-16 0 in 1 1 0 0 0 0 -
GPIO-17 1 out 1 1 0 0 0 0 -
GPIO-18 1 out 1 1 0 1 0 0 -
GPIO-19 1 out 0 0 0 1 0 0 -
GPIO-20 1 out 1 0 0 1 1 1 - pulled up
GPIO-21 1 out 0 0 0 1 0 0 - PCI Reset
GPIO-22 0 in 1 0 0 1 1 1 - wps button pulled up
GPIO-23 1 out 1 1 0 1 0 0 - likely endian select 0=little
name dir out altsel0 altsel1 od pudsel puden usage
- FB 3F 8B 04 E3 08 08 -
GPIO-24 1 out 1 1 0 1 0 0 -
GPIO-25 1 out 1 1 0 1 0 0 -
GPIO-26 0 in 1 0 1 0 0 0 -
GPIO-27 1 out 1 1 0 0 1 1 - pulled up
GPIO-28 1 out 1 0 0 0 0 0 - SC14488 dect chip reset
GPIO-29 1 out 1 0 0 1 0 0 - pci-req1
GPIO-30 1 out 0 0 0 1 0 0 - pci-gnt1
GPIO-31 1 out 0 1 0 1 0 0 -

USB Power? 13

from original bootlog: FXO reset using GPIO-10 FXO interrupt using GPIO-1 FXO Chip Select using GPIO-9

from u-boot, initial values are:

INIT_VAL_P0_DIR 2670
INIT_VAL_P0_OUT FBFF
INIT_VAL_P0_ALTSEL0 3873
INIT_VAL_P0_ALTSEL1 0201
INIT_VAL_P0_OD 77FF
INIT_VAL_P0_PUDSEL 4800
INIT_VAL_P0_PUDEN 4800
GPIO1
INIT_VAL_P1_DIR FBBE
#ifdef CONFIG_SHC_BT_PORTA_HW_SPIN1
#define INIT_VAL_P1_OUT 0x00002FD7
#else
#define INIT_VAL_P1_OUT 0x00003FD7
#endif
INIT_VAL_P1_ALTSEL0 8B87
INIT_VAL_P1_ALTSEL1 0400
INIT_VAL_P1_OD E3FC
INIT_VAL_P1_PUDSEL 0850
INIT_VAL_P1_PUDEN 0850

The board provides a further 24? GPOs (for leds) controlled by stp.

Buttons

Port Bit Key
0 2 Restart
0 15 Find handset
1 6 Wireless association

All buttons are active low.

LEDS

Near the 11 leds, there are two HC595: 8-Bit Serial-Input/Serial or Parallel-Output Shift Register with Latched 3-State Outputs (http://pdf1.alldatasheet.com/datasheet-pdf/view/46165/SLS/HC595.html)

The leds are grouped
3 for Power
3 for Broadband
2 for phone
2 for wireless
1 for upgrading

LED control base address is 0xBE100BB0 which correlates with ltq_register_gpio_stp.

Name Colour bit
Upgrading Orange = bit 13 (213 with 200 base added)
Phone Orange = bit 14 (214)
Blue = bit 15 (215)
Wireless Orange = bit 16 (216)
Blue = bit 17 (217)
Broadband Red = bit 18 (218)
Orange = bit 19 (219)
Blue = bit 20 (220)
Power Red = bit 21 (221)
Orange = bit 22 (222)
Blue = bit 23 (223)

Wireless

Atheros 9160-BC1A 802.11b/g/n, pci, 0x18000000, irq 22, slot 14
Marked as device 168C:FF1C

The calibration data is stored in the first 0x4000 bytes of the nand
the first 0x60 of these contain PCI register fixups, organised as Reg16:Value32. These need to be written to the PCI register space BEFORE the PCI device is probed… Support for this is now in trunk (Barrier Breaker).

unfortunately, wireless (PCI) and NAND (EBU) interact. for the moment, PCI gets inhibited while the nand chip is selected; I felt it better to have some wireless degradation rather than file system corruption.

FXO/FXS

The FXO/FXS interface for telephony is a combination of Teridian 73m1966 and Infineon Vinetic PEF4268F 'Ringing SLIC with Integrated DC/DC Converter', for which some drivers are available. I believe that as I write, some work may be being done on using SIP with the telephone interfaces.

DECT

The DECT modem (SiTel SC14488) is a processor in it's own right. It is connected to ttyLTQ0, and also to Danube PCM Lines? We would need firmware to run within the SiTel modem to talk to the Dect phones, and to understand the protocols on the serial control, as well as implement the PCM communication (which seems to be DMAed). There is an un-populated site for a serial eeprom? - so the firmware must be programmed by the main cpu at startup.

Although we have the original BT firmware for the DECT modem, there is little or no information regarding how this may be controlled. The control seems to be done from within the OpenRG application, for which we have no source.

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toh/bt/homehub_v2b.txt · Last modified: 2014/07/29 14:37 by benm