[linux-dvb] siano sms1xxx driver not T-DMB ready?

Michael Krufky mkrufky at linuxtv.org
Thu Oct 9 16:36:20 CEST 2008


Andrea Venturi wrote:
> here in Italy (bologna) we have a T-DMB trial from Rai and other 
> broadcasters.
> 
> i got one Terratec Cinergy Piranha based on a Siano SMS1xxx chip and 
> indeed the  T-DMB stream works on the "other OS".. (and the DVB-T works 
> too)
> 
> this T-DMB stuff is still based on Transport Stream:
> 
>  http://en.wikipedia.org/wiki/Digital_Multimedia_Broadcast
> 
> as i'd like to dump a full TS of the stream, i was thinking that it was 
> just setting the proper mode (2) in the sms1xxx module, i would have 
> been able to use the same "dvb-tools" like dvbstream to tune the right 
> frequency and dump the whole TS.
> 
> too easy, it seems! there were my steps:
> 
> 1. i put the firmware file for T-DMB demodulation with the right name  
> "tdmb_stellar_usb.inp" in /lib/firmware
> 
> 2. i loaded the module with the supposed right default mode: modprobe 
> sms1xxx default_mode=2
> 
> 3. i put my stick on the linux,  but the module didn't got up with this 
> error:
> 
>  "SMS Device mode is not set for DVB operation."
> 
> I'm halted.
> 
> The showstopper come from this smsdvb.c where there's this control:
> 
> ====================
>        if (smscore_get_devicke_mode(coredev) != 4) {
> #if 1 /* new siano drop (1.2.17) does this -- yuck */
>                sms_err("SMS Device mode is not set for "
>                        "DVB operation.");
>                return 0;
> #else
> ====================
> 
> of course, this seems only a safety check.
> 
> let's hope it's not just a "marketing" showstopper (i'm going anyway to 
> try to relax this control, i bet i'm not going to burn anything inside 
> the device!)
> 
> probably there's more to be implemented to driver correctly the Siano 
> chip when not in DVB mode. but how much? ask here could be useful..
> 
> it should be easy to "implement" the T-DMB stuff inside the same DVB 
> scenario!
> it's already a system based on transport stream. right?
> 
> sadly there are no open specs about it on the siano web site, just this 
> brief:
> 
>  http://www.*siano-ms*.com/*pdf*s/00_Siano_SMS*1010*.*pd*f
> 
> does anyone know a solution about this issue?
> 
> is it so though to implement T-DMB decoding inside the DVB architecture?
> 
> are the specs available somewhere?


I am working with Siano to expose all functionality of the silicon through the linux-dvb api.

We didn't get up to T-DMB yet.  Give a few months and there should be better info to report.

Regards,

Mike



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