[Bluez-devel] UART-based bluetooth stuff

[Bluez-devel] UART-based bluetooth stuff

[Russell King]

Hi,

Note: before anyone asks, I want to make it clear I do not have any
Bluetooth hardware. 8)


I'm digging about in the 8250 serial driver in 2.6 trying to clean up
the way we handle all the different UART variants.  I'm aware that BT
can use UARTs for communication.

I also know that some BT CF cards have OX950 UARTs in them.  Currently
these do not use the on-board hardware flow control capabilities, but
I'd like to correct that.  Since I don't have OX950 hardware to hand,
it's that's difficult to check the effects of that.

Does bluetooth use hardware flow control?  I'm lead to believe by BT
test program here that some BT serial protocols do and others don't.
Can someone clarify this.

Has anyone seen any other 8250-compatible UART types used for bluetooth?

Lastly, would they be willing victims^wtesters for serial patches? 8)

Thanks.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core


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Re: [Bluez-devel] UART-based bluetooth stuff

[Marcel Holtmann]

Hi Russel,

> I'm digging about in the 8250 serial driver in 2.6 trying to clean up
> the way we handle all the different UART variants.  I'm aware that BT
> can use UARTs for communication.
> 
> I also know that some BT CF cards have OX950 UARTs in them.  Currently
> these do not use the on-board hardware flow control capabilities, but
> I'd like to correct that.  Since I don't have OX950 hardware to hand,
> it's that's difficult to check the effects of that.
> 
> Does bluetooth use hardware flow control?  I'm lead to believe by BT
> test program here that some BT serial protocols do and others don't.
> Can someone clarify this.

at the moment some serial based PCMCIA or CF Bluetooth cards work and
some don't. I have no clue why this is so and I am no expert when it
comes to UART specific stuff. Some of these cards indeed work with a 2.4
kernel.

> Has anyone seen any other 8250-compatible UART types used for bluetooth?

Actually I think I have most of them at home. However there are a lot
more out there and it seems that any new PCMCIA of CF Bluetooth card is
a serial card with a Bluetooth chip attached to its UART.

> Lastly, would they be willing victims^wtesters for serial patches? 8)

I will do and I can also add them to my -mh patches.

Regards

Marcel




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