wiederling at googlemail.com
Wed Aug 20 22:24:46 CEST 2008
On 8/20/08, Andy Green <andy at openmoko.com> wrote:
> Yes, but the datasheet does not have all the info. There are various
> mask-programmed options on our variant I don't know are listed anywhere
> externally. But the basic deal is it switches on a bunch of regulators
> all at the same moment with a high current limit pretty much
> guaranteeing major dip in the rail that supplies them, when that rail is
> fed from USB with a 500mA limit itself and the battery. If the battery
> isn't "there" enough to support the supply rail (or at all) then the
> system fails to start up even.
Explains a bit why the batlevel is a jojo.
Is that supplemental info available somewhere?
The sensible thing to do is raise a minimal system and then
power up units one by one. Isn't ARM fully static?
i.e. could i have the cpu running from rom and some sram
in bits and bouts when "switched off"?
I'le read up a bit and then come back to you if I have a good idea.
More information about the hardware