Qualcomm documentation

Harald Welte laforge at gnumonks.org
Mon Dec 13 17:03:52 UTC 2010

Hi Drasko,

On Mon, Dec 13, 2010 at 05:33:58PM +0100, Drasko DRASKOVIC wrote:
> On Mon, Dec 13, 2010 at 5:15 PM, Harald Welte <laforge at gnumonks.org> wrote:
> > You are wrong.  All Android smartphones (with the exception of some legacy
> > ST-Ericsson devices) contain an independent ARM processor for the Baseband
> > and Application side.  The BP (in the QC case) runs L4 + AMSS (their stack),
> > the AP runs Linux natively without any hypervisor.
> Why do they need L4 if they are running just one container with AMSS ?
> Is there something else running on BP in L4 apart from AMSS (some
> other OS or RT apps) ?

not in the smartphone (dual-core) designs like the MSM7200A or the Snapdragon.

Of course, there are feature phones which only have a single core, e.g. built
around the MSM6275 or MSM6280, which then run BREW and various BREW
applications on top of the same L4.

you can compare the baseband processor part in a smart phoen more like the USB
GSM/3G Modem case:  No UI and no application software on the BP.

- Harald Welte <laforge at gnumonks.org>           http://laforge.gnumonks.org/
"Privacy in residential applications is a desirable marketing option."
                                                  (ETSI EN 300 175-7 Ch. A6)

More information about the baseband-devel mailing list