[Gta04-owner] GTA04A5 charging?

Rainer Blome rainer.blome at gmx.de
Wed Jul 12 16:58:04 CEST 2017


On July 11, 2017 11:00:00 AM GMT+01:00, gta04-owner-request at goldelico.com wrote:
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>Today's Topics:
>
>   1. GTA04A5 charging? (Martin Rottensteiner)
>   2. Re: GTA04A5 charging? (L.B.)
>   3. Re: GTA04A5 charging? (H. Nikolaus Schaller)
>   4. Re: GTA04A5 charging? (H. Nikolaus Schaller)
>
>
>----------------------------------------------------------------------
>
>Message: 1
>Date: Mon, 10 Jul 2017 21:06:19 +0200
>From: Martin Rottensteiner <martin.rottensteiner.list at gmail.com>
>To: gta04-owner at goldelico.com
>Subject: [Gta04-owner] GTA04A5 charging?
>Message-ID:
>	<CAE3hGsvgKoGwZJv5aqG7eP2aJZVmsE+yHEU_=sZY_1FEzzy7pg at mail.gmail.com>
>Content-Type: text/plain; charset="utf-8"
>
>Hi,
>
>I just got it in the mean time that the phone really starts on itself
>after
>plugging charger and cable (I have to wait some minutes). Then I get
>the
>boot screen where I can choose the partition where to boot the system
>from.
>>From this point on I wait about 15 sec, then the screen turns off and
>power
>button turns from red to off. There is no difference if I just wait at
>the
>boot screen or try to boot debian lxde or latest replicant (sms hack).
>
>It looks for me that the battery is not fully charged and I don't know
>how
>to charge it.
>
>Please help :)
>
>   Thanks, Martin
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>------------------------------
>
>Message: 2
>Date: Mon, 10 Jul 2017 20:23:51 +0100
>From: "L.B." <lionel.broche at gmail.com>
>To: List for communicating with real GTA04 owners
>	<gta04-owner at goldelico.com>
>Subject: Re: [Gta04-owner] GTA04A5 charging?
>Message-ID: <0a650b11-c380-5e89-b875-c0d3888f54cb at gmail.com>
>Content-Type: text/plain; charset="windows-1252"
>
>Hi Martin,
>
>I had a similar problem several times before, for me the problem was
>that the battery did not charge for long enough to allow the phone to
>boot completly, so that the boot process was interrupted by the battery
>discharge.
>
>To get around this I used to boot while pressing the AUX switch in
>order
>to get to the boot menu, and then select the hardware testing option
>(sorry, I cannot remember the exact name and my phone is dead at the
>moment so I cannot check). If you leave the phone for a while after
>that, the battery should charge and you can re-boot the phone normally.
>At least, that worked for me.
>
>Good luck!
>
>Lionel
>
>
>
>On 10/07/17 20:06, Martin Rottensteiner wrote:
>> Hi,
>>
>> I just got it in the mean time that the phone really starts on itself
>> after plugging charger and cable (I have to wait some minutes). Then
>I
>> get the boot screen where I can choose the partition where to boot
>the
>> system from.
>> From this point on I wait about 15 sec, then the screen turns off and
>> power button turns from red to off. There is no difference if I just
>> wait at the boot screen or try to boot debian lxde or latest
>replicant
>> (sms hack).
>>
>> It looks for me that the battery is not fully charged and I don't
>know
>> how to charge it. 
>>
>> Please help :)
>>
>>    Thanks, Martin
>>
>>
>> _______________________________________________
>> Gta04-owner mailing list
>> Gta04-owner at goldelico.com
>> http://lists.goldelico.com/mailman/listinfo.cgi/gta04-owner
>
>
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>------------------------------
>
>Message: 3
>Date: Mon, 10 Jul 2017 21:18:39 +0200
>From: "H. Nikolaus Schaller" <hns at goldelico.com>
>To: List for communicating with real GTA04 owners
>	<gta04-owner at goldelico.com>
>Subject: Re: [Gta04-owner] GTA04A5 charging?
>Message-ID: <46E82CF9-FD11-42F7-8C6A-861DE238B869 at goldelico.com>
>Content-Type: text/plain; charset=us-ascii
>
>Hi Martin,
>
>> Am 10.07.2017 um 21:06 schrieb Martin Rottensteiner
><martin.rottensteiner.list at gmail.com>:
>> 
>> Hi,
>> 
>> I just got it in the mean time that the phone really starts on itself
>after plugging charger and cable (I have to wait some minutes).
>> Then I get the boot screen where I can choose the partition where to
>boot the system from.
>
>Press "OFF" here as quickly as possible. It will turn off the GTA04 -
>but will continue trickle charging even if voltage becomes higher.
>
>After a while the battery should have become full enough to boot Linux
>until it enables full charging to get to 100%.
>
>> From this point on I wait about 15 sec, then the screen turns off and
>power button turns from red to off.
>
>Looks like empty battery (<3.2V). It charges in trickle charge mode
>(~100mA) until the GTA04 turns on. Then, U-Boot and Display and Linux
>etc.
>draw ca. 400mA which is more than trickle charging supplies. Therefore
>the battery starts discharging which holds approx. 15 seconds you see.
>If Linux boots fast enough it would enable 500mA charging. If not, the
>battery is drained to the auto-power-off point.
>
>> There is no difference if I just wait at the boot screen or try to
>boot debian lxde or latest replicant (sms hack).
>> 
>> It looks for me that the battery is not fully charged and I don't
>know how to charge it. 
>> 
>> Please help :)
>
>Please let us know if that helps,
>Nikolaus
>
>
>
>------------------------------
>
>Message: 4
>Date: Mon, 10 Jul 2017 21:22:08 +0200
>From: "H. Nikolaus Schaller" <hns at goldelico.com>
>To: List for communicating with real GTA04 owners
>	<gta04-owner at goldelico.com>
>Subject: Re: [Gta04-owner] GTA04A5 charging?
>Message-ID: <14320336-013F-43A8-A48F-36E4A5D6D25D at goldelico.com>
>Content-Type: text/plain; charset=us-ascii
>
>
>> Am 10.07.2017 um 21:18 schrieb H. Nikolaus Schaller
><hns at goldelico.com>:
>> 
>> Hi Martin,
>> 
>>> Am 10.07.2017 um 21:06 schrieb Martin Rottensteiner
><martin.rottensteiner.list at gmail.com>:
>>> 
>>> Hi,
>>> 
>>> I just got it in the mean time that the phone really starts on
>itself after plugging charger and cable (I have to wait some minutes).
>>> Then I get the boot screen where I can choose the partition where to
>boot the system from.
>> 
>> Press "OFF" here as quickly as possible. It will turn off the GTA04 -
>but will continue trickle charging even if voltage becomes higher.
>
>In other words: it will not attempt to boot again even if the battery
>becomes fuller and fuller.
>This auto-poweron happens only when voltage rises above ca. 3.2V.
>
>> 
>> After a while the battery should have become full enough to boot
>Linux until it enables full charging to get to 100%.
>
>Just press the power button after some hour.
>
>> 
>>> From this point on I wait about 15 sec, then the screen turns off
>and power button turns from red to off.
>> 
>> Looks like empty battery (<3.2V). It charges in trickle charge mode
>(~100mA) until the GTA04 turns on. Then, U-Boot and Display and Linux
>etc.
>> draw ca. 400mA which is more than trickle charging supplies.
>Therefore the battery starts discharging which holds approx. 15 seconds
>you see.
>> If Linux boots fast enough it would enable 500mA charging. If not,
>the battery is drained to the auto-power-off point.
>> 
>>> There is no difference if I just wait at the boot screen or try to
>boot debian lxde or latest replicant (sms hack).
>>> 
>>> It looks for me that the battery is not fully charged and I don't
>know how to charge it. 
>>> 
>>> Please help :)
>> 
>> Please let us know if that helps,
>> Nikolaus
>> 
>> _______________________________________________
>> Gta04-owner mailing list
>> Gta04-owner at goldelico.com
>> http://lists.goldelico.com/mailman/listinfo.cgi/gta04-owner
>
>
>
>------------------------------
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>------------------------------
>
>End of Gta04-owner Digest, Vol 79, Issue 4
>******************************************

This issue comes up so often that I wonder if anything can be done to fundamentally avoid it. 
The auto-boot voltage level should be high enough so that full boot is likely to succeed before the boot process itself drops voltage to the power-off level, no? Sounds like the level at which the system auto-boots is currently too low, at least for some batteries.

Can the auto-boot voltage level be changed?

Another avenue might be a separate OS instance that boots fast enough, 
dedicated to charging only. Many Android systems use this technique, and successfully so, it seems to me.

Rainer
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