status of libertas_tf + sdio?

[Vasily Khoruzhick]

On Wed, Dec 11, 2013 at 11:55 PM, James Cameron <quozl at laptop.org> wrote:
> On Wed, Dec 11, 2013 at 11:10:50AM +0300, Vasily Khoruzhick wrote:
>> On Tue, Dec 10, 2013 at 5:27 AM, James Cameron <quozl at laptop.org> wrote:
>> > On Mon, Dec 09, 2013 at 12:38:28PM +0300, Vasily Khoruzhick wrote:
>> >> On Mon, Dec 9, 2013 at 7:18 AM, James Cameron <quozl at laptop.org> wrote:
>> >> > On Fri, Dec 06, 2013 at 01:40:00PM +0300, Vasily Khoruzhick wrote:
>> >> >> Out of curiosity,
>> >> >>
>> >> >> Does anyone know if it's possible to get thin firmware for 8686 with
>> >> >> SPI interface?
>> >> >
>> >> > What happens when you try?
>> >>
>> >> How? There's no tf available for 8686 with SPI interface.
>> >
>> > How do you know that?  Are you saying that SPI support was removed
>> > from firmware during the conversion from fat to thin?
>>
>> Err, there's no lbtf_spi.bin file.
>
> Basing decisions on the names of files rather than the code they
> may contain seems rather limiting.
>
> In the absence of evidence, there's a possibility that SPI support
> remained.

But fat firmware differs for SPI and SDIO

>> >> > How are you downloading firmware over SPI?
>> >>
>> >> See drivers/net/wireless/libertas/if_spi.c, but it's for fat
>> >> firmware
>> >
>> > What happens if you send the thin firmware instead?
>>
>> I have no thin firmware for 8686 with SPI interface
>
> What happens if you send the thin firmware for SDIO interface to the
> device using the fat firmware helper for SPI interface?
>
> I don't have an SPI setup to test, but I gather you do.

OK, I'll try.

>> >> > I'm not aware of a second stage firmware download helper
>> >> > specific to the SPI mode.
>> >>
>> >> What's a second stage firmware download helper?
>> >
>> > File sd8686_helper.bin, we use it in Open Firmware with SDIO 8686 on
>> > OLPC XO.
>> >
>> > For SPI, which we don't use, I see if_spi.c uses gspi8686_v9_helper.bin
>> >
>> > I was wrong; I am now aware of a second stage firmware downloader
>> > helper specific to the SPI mode.  I hadn't looked before.
>> >
>> >> > I think it is not possible without firmware engineering.
>> >>
>> >> Yeah, just hoped that Marvell already did it. It's a pity that
>> >> firmware source code isn't available :(
>> >
>> > Cozybit did the thin firmware, if I recall correctly.
>>
>> Do you think it makes sense to contact them?
>
> I don't think it makes sense to ignore them, but I don't wish to
> speculate further.

OK, thanks!

Regards
Vasily

> --
> James Cameron
> http://quozl.linux.org.au/