Bticino F454

This page shall be a container for various pieces of information about Bticion's F454. Most of the information is - for now - derived from just poking around on the device with SSH. So, due to this and in general: of course certain details can be unsure or not accurate, because something has been overlooked.

The F454 is a typical embedded system using a SoC and running a Linux-based system.

Hardware

The F454 is based on TI's (Texas Instruments) DaVinci DM365 SoC, from 2009. The Wikipedia page Texas Instruments DaVinci can be used as a first overview.

The SoC does include, among many peripherals, an ARM processor:

• family: ARM9E
• architecture: ARMv5TEJ
• core: ARM926EJ-S

Apparently DM365 SoCs can run with 216 MHz, 270 MHz or 300 MHz.

A look at Linux' /proc/cpuinfo confirms:

root@basi:~# cat /proc/cpuinfo 
Processor	: ARM926EJ-S rev 5 (v5l)
BogoMIPS	: 134.34
Features	: swp half thumb fastmult edsp java 
CPU implementer	: 0x41
CPU architecture: 5TEJ
CPU variant	: 0x0
CPU part	: 0x926
CPU revision	: 5

Hardware	: BTicino BASI board
Revision	: 0000
Serial		: 0000000000000000

The system includes a device called bt_nexmed_hwmon.0. It is registered as a Linux hardware monitoring device and provides further information.

root@basi:~# cd /sys/devices/platform/bt_nexmed_hwmon.0
root@basi:/sys/devices/platform/bt_nexmed_hwmon.0# ls in* temp*
in1_input    in1_label    in2_input    in2_label    in4_input
in4_label    in5_input    in5_label    temp1_input  temp1_label

input	label	typical value	comment
in1	Hw version	0
in2	board identification	BASI BOARD
in4	cpu speed	270MHz
in5	board configuration	4	unknown - what does it mean?
temp1	Temperature	38	most likely in celcius?

/proc/meminfo lets us assume the SoC is equipped with most likely >102 MB of RAM:

root@basi:/sys/devices/virtual/gpio# cat /proc/meminfo | head -n 1
MemTotal:         103968 kB

Obviously there is no such thing as a 103968 kB RAM chip. So whatever size the RAM actually is - the assumption is that the rest of the RAM is associated with the DM365's HDVICP1 co-processor?

The HDVICP1 is a 720p H264 encoder and decoder included in the DaVinci DM365 SoC. Altogether the DM365 SoC seems to be the most equipped DaVinci SoCs of it's series and time (2008/2009).

Question: Why DM365 - why does the F454 need this 720p en/decoding capability. Wouldn't a DM355 also do it? Related to video door entry systems?

The following talk by Raffaele Recalcati on FOSDEM 2011 provides some more details: DaVinci dm365 for home automation Video Slides (English). However it does not explicitly mention the F454. It includes background information, development history and even block diagrams. From the same author there is a presentation from 2012 called Linux in Bticino (Italian). It apparently includes more of Bticino's history in home automation and even something on the userspace application stack.

TODO: more

Software

Operating System

TODO

Applications

TODO