[Gta04-owner] Offering a present for Christmas
S.Dyroff at phytec.de
Thu Oct 4 10:55:25 CEST 2012
> If you really power off the device (through the TPS65950) and have
> off the UMTS module correctly there is only the RTC and scanning of the
> button left over, i.e. there are no consumers connected directly to the
> except the PMIC and the UMTS module. And power consumption is in the uA
> range (maybe 100 uA). This has been proven during development of the
my GTA04A4 even with QtMoko v38 (-> kernel 3.5) still drains battery
during poweroff. I still always have to remove the battery after power off
in order to stop that. Not very healthy for the case.
> ... but I think that such a sub-populated board doesn't help much.
> The problematic part appears to correctly shut down the unused
> components within the PMIC and the OMAP+PoP but keep suspend
> to RAM work correctly. And maybe one or two of the peripheral
> components are not shut down correctly (e.g. ITG3200, IrDA).
> But those would be missing on the subpopulated device.
It was just an idea. You're free to modify it if you find that another
combination of a sub-populated board will help finding the cause for the
needlessly power drainage. I only say: If you and a kernel developer come
to the conclusion that it helps to make a subpopulated device and that its
costs are max. 400 EUR, you may send me the bill. I hold this offer up to
the end of November.
Von: "Dr. H. Nikolaus Schaller" <hns at goldelico.com>
An: List for communicating with real GTA04 owners
<gta04-owner at goldelico.com>
Datum: 04.10.2012 10:08
Betreff: Re: [Gta04-owner] Offering a present for Christmas
Gesendet von: gta04-owner-bounces at goldelico.com
Am 02.10.2012 um 10:31 schrieb Sven Dyroff:
Christmas is approaching and so I wanna stress the discussion of donations
once again. Last time I did the result was, that giving donations to
hardware projects would be better than for software projects, because
promoting hardware projects results in bringing forward every software
project, not only one. OK, accepted. So here's my new offer:
One of the biggest disadvantages of the gta04 still is its huge power
consumption. Most people in this list quarrel with power drainage during
suspend. To be quite clear: For me this is not the case, due to the
reasons that I already described within this list, earlier. I can easily
live with its current power drainage during suspend. But I emphatically
quarrel with power drainage during poweroff! During poweroff the device
should only take some µA for RTC and scanning power button. Everything
above of that is much too much. And it's clear that if someone would be
able to achieve this, it would be a nice side-effect that probably suspend
would then also take less power.
So I come back to the idea I already described here some months ago. Why
not make one special gta04a4, whose plate has absolutely no parts
- OMAP with POP memory
- RS232 tranceiver
- USB tranceiver
- SD card slot
I think for a kernel developer who is hunting araound for mA and µA,
having such a device in addition to the ordinary gta04a4 would make things
Generally it is IMHO a very good idea to bring down standby current
consumption, but I think that such a sub-populated board doesn't help
If you really power off the device (through the TPS65950) and have
switched off the UMTS module correctly there is only the RTC and scanning
of the power button left over, i.e. there are no consumers connected
directly to the battery except the PMIC and the UMTS module. And power
consumption is in the uA range (maybe 100 uA). This has been proven during
development of the board.
The problematic part appears to correctly shut down the unused components
within the PMIC and the OMAP+PoP but keep suspend to RAM work correctly.
And maybe one or two of the peripheral components are not shut down
correctly (e.g. ITG3200, IrDA). But those would be missing on the
So I'm willing to pay GD for a making such a special gta04a4, if there's
also at least one kernel developer who offers to spend a seriously amount
of time to do this work. If he succeeds, he may keep this device as
present. Otherwise I'll continue to claim the ownership of it for me, in
order to be able to pass it to the next kernel developer, who wants to
crack the hard nut...
P.S.: When making this offer, I expect that the costs for it will be max.
400 EUR. @Nikolaus: If this assumption is wrong, please tell me.
It could fit if the UMTS module is left off. This is the most expensive
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