Instructions on how to use pskey to set csr into h4 mode on ipaq H3600
=============================================================================
by Sam Engström (mail@samengstrom.com), please correct errors if you
encounter them.

IMPORTANT UPDATE!
I wrote these instructions in 2002 with ipaq H3600 in mind. They quite likely
will not work on other ipaqs, and are known to render bluetooth on ipaq 3870s
unusable.

--
On Thu, 11 Dec 2003, Paolo Marques wrote:

The iPaq 3870 uart doesn't support 1Mbit, so [using the pskey settings in
this document] renders the csr chip useless.

The original factory pskey settings for a 3870 iPaq are (according to Andrew 
Christian, and verified by me):

0191 03b0 0006 00fa 0014 0004 0000 0004 001e 0064 000a
01f9 0001
--

The rest of this document remains unchanged after 2002-05-23, and it is
assumed that you know that the values you are using are the correct ones for
your hardware.

WARNING: If you type the commands incorrectly you may render the HSR 
         chip unusable beyond reboots. Be careful and double check every
         command before quitting pskey after which the changes are 
         applied.

DISCLAIMER: I claim no responsibility if you choose to proceed and do 
            render the chip unusable.

These instructions have been derived from my e-mail correspondence with
Fabrizio Gennari, the author of pskey. Please read his posting to the
bluez-devel mailing list at
http://www.geocrawler.com/archives/3/11993/2002/3/100/8148714/

And here's what he wrote about the command line
Usage:
pskey [-b] [-d device] [-s speed]

-b: use BCSP (default:use H4)
device: device file representing the serial port the BT device is
connected to (default:/dev/ttyS0)
speed: speed of serial port in bit/s (default:115200)

On the pskey command line:
- to read a key, just type its number in hex
- to write a key, type its number in hex followed by the new value, words
separated by spaces

Here are the instructions:

Commands and output					My comments
=============================================================================
# ./pskey -b -d /dev/tts/0				you might need
							to replace /dev/tts/0
							with something else,
							for example
							/dev/ttySB0
							and the speed might
							also be initially
							set to 230400 so you
							might need -s

Physical device :/dev/tts/0
Speed           :115200
Use BCSP        :YES
Initiating read thread
BT SYS: Initializing BCSP
BT SYS: BCSP initialized and syncronized
Synchronized
Successfully read firmware info.
 Firmware version: 115
pskey>1f9 0003						this sets the
							mode to h4
Warning: timeout on BCSP data send, resending		never mind these
Warning: timeout on BCSP data send, resending		warnings if you get
							them
Key 01f9 length 1
0001
The new length of key 1f9 will be 1
The new value will be 0003
Type yes to write those values, anything else to cancel
yes or no>yes
pskey>191 01d8 00a8 00fa 0014 0004 0000 0004 001e 0064 000a
							this sets the
							initial baud rate
							and other settings
Key 0191 length 10
1000 0006 00fa 0014 0004 0000 0004 001e 0064 000a	if your settings
							differ from this
							you need to use your
							own last 8 words
The new length of key 191 will be 10
The new value will be 01d8 00a8 00fa 0014 0004 0000 0004 001e 0064 000a
Type yes to write those values, anything else to cancel
yes or no>yes
pskey>191						you may choose to
							verify that the
							changes have
							actually happened
Key 0191 length 10
01d8 00a8 00fa 0014 0004 0000 0004 001e 0064 000a
pskey>1f9
Key 01f9 length 1
0003
pskey>quit						and we're done
End
							now, if you want to
							run pskey again, you
							need to set the baud
							rate as follows
# setserial /dev/tts/0 baud_base 1000000
							remember that we're
							in h4 mode now, so
							no -b!
# ./pskey -d /dev/tts/0
...

=============================================================================
2003-12-11 Sam Engström