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>(unless you're using one of the few phones with separate userspace and baseband processors) Such as which ones? Or is this something I quick google could brin

>(unless you're using one of the few phones with separate userspace and baseband processors) Such as which ones? Or is this something I quick google could bring up?

mmastrac 12y ago
Couldn't tell you nowadays. IIRC Apple still separates baseband and main CPU. The last ones I recall that did this were Palm devices (potentially up to the WebOS ones). GSM Arena doesn't appear to have this information. You might have to go through iFixit teardowns. It's also possible this isn't something happening today -- I've been out of this arena for some time. What you want to look for is something like this, where you see both a CPU and a processor like the MDM6600: https://www.ifixit.com/Teardown/Motorola+Droid+Bionic+Teardown/6449 https://www.ifixit.com/Teardown/Motorola+Droid+Bionic+Teardo...
- userbinator 12y ago
  Practically all phones have separate application/baseband processors, since the baseband processing has hard realtime constraints; I think what you're more interested in is whether the baseband CPU has direct access to the main memory and CPU, and that's not something that can be discerned physically. Even with physically separate baseband/AP CPUs, the former might have DMA access to main memory.
  - slavak 12y ago
    Off-topic, but I couldn't help pointing out that saying "DMA access to main memory" is even worse than the classic "ATM machine" or "PIN number."
    - angry_octet 12y ago
      Since we're nitpicking, no it isn't. DMA is a particular method of accessing memory. You can have direct mapped access, cache mediated, PIO, DMA, etc. There can be many different memories, such as expansion cards, where you could DMA to/from, apart from main memory.
remael 12y ago
Openmoko Neo Freerunner (GTA02), Nokia N900 (afaik) though not recent phones. Then there is GTA04 by Goldelico. There is also a project called Neo900 which aims to do small upgrades to N900 and fence in baseband even more. You will be in control of application CPU and able to monitor baseband activities.
Torgo 12y ago
Supposedly the Galaxy Nexus has the baseband separate and communicates over a serial connection. An anonymous person passed this info to the Replicant project. I wish there was a way to verify this.

>(unless you're using one of the few phones with separate userspace and baseband processors) Such as which ones? Or is this something I quick google could bring up?

mmastrac 12y ago

Couldn't tell you nowadays. IIRC Apple still separates baseband and main CPU. The last ones I recall that did this were Palm devices (potentially up to the WebOS ones). GSM Arena doesn't appear to have this information. You might have to go through iFixit teardowns. It's also possible this isn't something happening today -- I've been out of this arena for some time. What you want to look for is something like this, where you see both a CPU and a processor like the MDM6600: https://www.ifixit.com/Teardown/Motorola+Droid+Bionic+Teardown/6449 https://www.ifixit.com/Teardown/Motorola+Droid+Bionic+Teardo...

userbinator 12y ago
Practically all phones have separate application/baseband processors, since the baseband processing has hard realtime constraints; I think what you're more interested in is whether the baseband CPU has direct access to the main memory and CPU, and that's not something that can be discerned physically. Even with physically separate baseband/AP CPUs, the former might have DMA access to main memory.
- slavak 12y ago
  Off-topic, but I couldn't help pointing out that saying "DMA access to main memory" is even worse than the classic "ATM machine" or "PIN number."
  - angry_octet 12y ago
    Since we're nitpicking, no it isn't. DMA is a particular method of accessing memory. You can have direct mapped access, cache mediated, PIO, DMA, etc. There can be many different memories, such as expansion cards, where you could DMA to/from, apart from main memory.

remael 12y ago

Openmoko Neo Freerunner (GTA02), Nokia N900 (afaik) though not recent phones. Then there is GTA04 by Goldelico. There is also a project called Neo900 which aims to do small upgrades to N900 and fence in baseband even more. You will be in control of application CPU and able to monitor baseband activities.

Torgo 12y ago

Supposedly the Galaxy Nexus has the baseband separate and communicates over a serial connection. An anonymous person passed this info to the Replicant project. I wish there was a way to verify this.