Am 23.11.2016 um 10:19 schrieb Linux-SWAT openpandora@free.fr:
Le 2016-11-23 08:41, H. Nikolaus Schaller a écrit :
Hi,
Am 22.11.2016 um 23:03 schrieb Linux-SWAT openpandora@free.fr: New test with the EVM and official Pandora 5V adapter, the red warning LED shows up on the board.
I am not sure if it is intended to be a "warning" LED... (Table 1 of the EVM description calls it "Red Power Input Voltage Indicator").
It shows up only with 5V plugged in, not with 12V.
Yes, that is how it is designed in the schematics of the EVM. I think the point where it is switched off is above ca. 5.6V.
This also switches the USB host port VBUS to a separate 5V regulator instead of forwarding the input voltage.
I boot with the pre-compiled Letux-4.9.0-rc5 on Slackware -current armhf. 3 neon loops, 1 memtester on 2G. No problem after more than 30 hours, dmesg is clean. cpufreq stats: 1000 MHz:0.15%, 1.50 GHz:99.85% 64°C
Interesting! That seems to be fine!
Do I let it run ?
Can you also check the VSYS_COBRA voltage of your setup? It might be higher than mine @5V. It should by theory be 3.7V but in practice I have seen it to go down to 3.088V. Here is a script: http://git.goldelico.com/?p=gta04-kernel.git;a=blob_plain;f=Letux/root/tempe... which locates the gpadc inside the PALMAS and reads the VSYS voltage.
Here it is : Wed Nov 23 09:13:24 -00 2016 64° 47° 51° 3449mV 1500MHz
Ok! 3449mV is much better than my 3088mV.
And still running fine : $ uptime 09:17:06 up 1 day, 18:06, 1 user, load average: 4.38, 4.40, 4.37
I am quite sure that it will continue forever...
Generally we are here in an area where it should also work under worst case environment conditions. Worst case is the weakest power supply we can find...
BR and thanks, Nikolaus