GTA04 PMU / Core arch block diagram v1

Harald Welte laforge at
Thu Apr 3 15:38:58 CEST 2008

On Wed, Apr 02, 2008 at 01:51:39PM +0100, Andy Green wrote:
> Hash: SHA1
> Somebody in the thread at some point said:
> | | the MPU, so you can make calls over BT with the CPU off?
> |
> | ...oooh, very good point.
> Hum don't know if we can do it or not.  The current BT device uses USB
> to communicate with the CPU, which will go down with the CPU.  We can
> still power it though, so if it doesn't reset itself or otherwise rely
> on USB comms (eg, for clock) it can work.

I think BT should rather use a high-speed UART or SDIO  than USB.  USB
is really cumbersome in the suspend/resume case, esp. with regard to the
wakeup-from-bluetooth case (talk to Marcel Holtmann, if you need

- Harald Welte <laforge at>         
Software for the world's first truly open Free Software mobile phone

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