4 Oct
2012
4 Oct
'12
1:10 p.m.
Denis 'GNUtoo' Carikli писал 04.10.2012 14:26:
On Thu, 4 Oct 2012 00:32:48 +0200
Peter Stuge <peter(a)stuge.se> wrote:
In addition to the above, there are some phones where baseband is
completely
submissive to the AP, namely Galaxy SII. Basically it's exactly the
same
as the USB dongle situation, but the dongle is integrated on the
phone's
PCB.
John Case wrote:
In some yes, in some no... it depend on how the
smartphone was
designed:
On one end some smartphones (openmoko GTA02,golden delicious GTA04),
the
baseband is isolated(tough on GTA04 it has access to a GPS with no
antenna(so it can't work)) . And on the other end there are
smartphones
with qualcomm System on a chip...where the modem and the CPU are in a
single chip:
The modem part has the audio DSP connected to it, the GPS.
And the baseband uses shared RAM memory and shared NAND(if I remember
well)...
And I'm not sure but maybe the baseband is even needed for booting
the
main CPU...
There are also systems in between like the galaxy S/Neuxs S that uses
shared memory but do not have other problems... the real trick I am interested is isolating (or
at least
controlling) the interaction between the baseband processor and
the
application processor. Using a computer with a
USB dongle gives
me
that control ... would I have that same level of
control if we had
free software running on the baseband processor, or is there still
additional bleeding possible simpy by virtue of being built into
the computer ?
In a smartphone it's almost not possible to distinguish the
"computer" from the "GSM modem" anymore, because of how the
hardware is constructed, so yes.
Denis.
--
WBR, Peter Zotov.