<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><br class=""><div><div class="">Am 13.07.2017 um 06:33 schrieb H. Nikolaus Schaller <<a href="mailto:hns@goldelico.com" class="">hns@goldelico.com</a>>:</div><br class="Apple-interchange-newline"><div class=""><div dir="auto" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Hi Rainer,<div class=""><br class=""><div style="direction: ltr;" class=""><blockquote type="cite" class=""><div class="">Am 12.07.2017 um 16:58 schrieb Rainer Blome <<a href="mailto:rainer.blome@gmx.de" class="">rainer.blome@gmx.de</a>>:</div></blockquote><blockquote type="cite" class=""><div class=""><div class=""><br clear="all" class="">This issue comes up so often that I wonder if anything can be done to fundamentally avoid it. <br class="">
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.<br class="">
<br class="">
Can the auto-boot voltage level be changed?<br class=""></div></div></blockquote><div style="direction: ltr;" class=""><br class=""></div>No. Or well, it can * after* the first successful boot. But it is reset to hardware defaults after removing the battery.</div><div style="direction: ltr;" class=""><br class=""><blockquote type="cite" class=""><div class=""><div class="">Another avenue might be a separate OS instance that boots fast enough, <br class="">
dedicated to charging only. Many Android systems use this technique, and successfully so, it seems to me.<br class=""></div></div></blockquote><div style="direction: ltr;" class=""><br class=""></div>There is indeed a known trick: switch the charger to 500mA capability in U-Boot (or even MLO), i.e. within the first 5 seconds.</div><div style="direction: ltr;" class="">Then, the GTA04 can run continuously from USB charger (drawing ca. 400mA from the 500mA provided).</div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class="">We even have some disabled fragment sitting in our U-Boot and an issue report for this:</div></div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class=""><div style="direction: ltr;" class=""><a href="http://projects.goldelico.com/p/gta04-xloader/issues/279/" class="">http://projects.goldelico.com/p/gta04-xloader/issues/279/</a></div><div style="direction: ltr;" class=""><br class=""></div></div><div style="direction: ltr;" class=""><a href="http://git.goldelico.com/?p=gta04-uboot.git;a=blob;f=board/goldelico/letux-gta04/twl4030-additions.c;h=0d0c4f385b7d09ef63c4738ca15ed7fccd8617d6;hb=0c5e26e7886ea7d2d934f65e2e6cbf15a2b52bc8#l405" class="">http://git.goldelico.com/?p=gta04-uboot.git;a=blob;f=board/goldelico/letux-gta04/twl4030-additions.c;h=0d0c4f385b7d09ef63c4738ca15ed7fccd8617d6;hb=0c5e26e7886ea7d2d934f65e2e6cbf15a2b52bc8#l405</a></div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class="">In earlier U-Boot/MLO we had another patch:</div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class=""><a href="http://git.goldelico.com/?p=gta04-xloader.git;a=blob;f=board/omap3530gta04/omap3530gta04.c;h=1d490c94ad11f5fdba1b3660cce340bde7fb6fa2;hb=HEAD#l112" class="">http://git.goldelico.com/?p=gta04-xloader.git;a=blob;f=board/omap3530gta04/omap3530gta04.c;h=1d490c94ad11f5fdba1b3660cce340bde7fb6fa2;hb=HEAD#l112</a></div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class="">But this was never worked out or tested. AFAIR it did *not* work as in the source code.</div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class="">And it needs someone who wants to write and debug a patch.</div><div style="direction: ltr;" class=""><br class=""></div><div style="direction: ltr;" class="">BR,</div><div style="direction: ltr;" class="">Nikolaus</div><div style="direction: ltr;" class=""><br class=""></div></div></div></div><br class=""></body></html>