Fwd: Adding a system management MPU

[Wolfgang Spraul]

fyi

Begin forwarded message:

> From: Werner Almesberger <werner at openmoko.org>
> Date: March 19, 2008 5:56:51 AM GMT+08:00
> Subject: Re: Adding a system management MPU
>
> Andy Green wrote:
>> If we allow "system MPU" reprogramming and therefore bricking  
>> (which we
>> should) it too can be debricked over JTAG, so having a physical  
>> debrick
>> / hacking port of last resort is still valuable.
>
> Hmm, those TI chips seem to speak regular JTAG, so why not just add
> them to the JTAG chain ? The only tricky bit may be that we'd have to
> be able to keep them from messing with the PMU, or the system may
> never power up properly if something goes terribly wrong with the MPU
> firmware.
>
> Cheers, Werner

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