Apparently you need not the following steps anymore to get Bluetooth to work on the H3870. I would strongly advice you to check the Bluez mailing lists before following the steps listed. It has been a very long time since I worked on this and will not be able to help you much. link
- Vijay

1. If you ave not already done it, upgrade your kernel to 2.4.18-rmk3-hh4. Steps to upgrade your kernel is available in this document(will be up soon).I also have the compiled kernel and modules. Contact me if you want them.



2. Get the latest Bluez tools and libraries from here. They are avaiable in the master package "task-bluez". So a simple
    # ipkg update
    # ipkg install task-bluez
should install the packages for you. For this to work, you must point your ipkg to pull packages from http://familiar.handhelds.org/familiar/feeds/unstable/packages/armv4l. You can set ipkg to pull of from a particular URL by modifying /etc/ipkg.conf.


3. The Bluetooth radio in H3870 runs by default in BCSP mode, while Bluez supports H4 mode. So the radio has to be configured to run H4 mode before it will work with Bluez. To do this, you need to use the "pskey" software that is available with the "task-bluez" package. This tool re-writes the firmware to work in H4. Please be careful when you do this!!! If you do something strange to your chip, it's not clear it can be fixed.



4. Run pskey with the device as /dev/ttySB0 and speed at 230400
    # pskey -b -d/dev/ttySB0 -s 230400

The -b tells it to run using BCSP which the default in the chip.
    # pskey -b -d/dev/ttySB0 -s 230400
    Physical device :/dev/tts/0
    Speed :115200
    Use BCSP :YES
    <some more messages>
    pskey>


5. Once you get this prompt, type
    pskey>1f9 0003
    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
This basically sets the key to H4. BCSP has a value of 0001 and H4 has value 0004.


6. Finally type
    pskey>191 01d8 00a8 00fa 0014 0004 0000 0004 001e 0064 000a
    Key 0191 length 10
    03b0 0006 00fa 0014 0004 0000 0004 001e 0064 000a
    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
This sets the speed to 115200 and to use H4. For further details on what this means refer to [3].


7. Now you are in business. Include the following lines to /etc/modules.conf:
    alias tty-ldisc-15 hci_uart
    alias net-pf-31 bluez
    alias bt-proto-0 l2cap
    alias bt-proto-2 sco


8. Type
    # hciattach /dev/ttySB0 csr
This will load the modules and start the device.


9. Execute hcid
    # hcid


10. Execute hciconfig and get the local address.
    # hciconfig hci0
You can also use hcitool for setting up connections, to inquire, and to get the local address. Once you have another device also running, you can do l2ping etc. For more on Bluez, look at the [4].

References.
[1]. Andrew's post on the newsgroup.
[2]. Sam Engström's page on Bluetooth.
[3]. Fabrizio Gennari notes on the mailing list.
[4]. Bluez HowTo.
[5]. Handhelds.org.