From: Michal Semler <cijoml@volny.cz>
Reply-To: cijoml@volny.cz
To: bluez-users@lists.sourceforge.net
Subject: Re: [Bluez-users] CSR firmware
References: <200405290256.06151.cijoml@volny.cz> <1085820898.3932.6.camel@pegasus>
In-Reply-To: <1085820898.3932.6.camel@pegasus>
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Message-Id: <200405291108.06457.cijoml@volny.cz>
Sender: bluez-users-admin@lists.sourceforge.net
Errors-To: bluez-users-admin@lists.sourceforge.net
Date: Sat, 29 May 2004 11:08:05 +0200

On Saturday 29 of May 2004 10:54, Marcel Holtmann wrote:
> Hi Michal,
>
> > have anybody downloaded firmware from csr dongle? I would like to make
> > research if is possible to change vendor ID in it and then flash it back.
> > I think it is possibly way to upgrade firmware in old dongles.
> >
> > Can somebody give me help how download it? I have now access to 14
> > different csr based dongles from different wendors, which have same
> > firmware version. So I'll try find differences in firmware.
>
> the software you search for is my btdfu tool.
>
> 	http://www.holtmann.org/linux/bluetooth/btdfu-0.2.tar.gz
>
> And you upload a firmware from the dongle (archive mode) and you
> download a new one to a dongle (upgrade mode).
>
> The problem is not the vendor ID. It is the digital signature of the
> firmware file. You can download everything you want onto your dongle,
> but it can happen that the boot loader don't boot the other firmware. In
> that case it will stay in DFU mode. The boot loader can only be changed
> over a SPI connection.

That means, that if I download from dongle original firmware and then flash 
other one into dongle and it will not work I can't flash original fw back?

What is SPI connection?

Any related docs?

Michal


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