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<libv>
swiftgeek: so what were you doing that meant that the shell was not grounded?
<swiftgeek>
not quite, monitors expected it to be the same as GND pin
<swiftgeek>
and used GND pin as input instead
<libv>
oh, reread
<libv>
right
<libv>
what monitor is this?
<libv>
as this i have never heard before
<gamiee>
I encountered this when HDMI connector was near of some strong RF transmitter. Due I2C is not differential pair, it started to disrupting it.
<swiftgeek>
well i keep having that issue everywhere, and it looks to be due to feature on monitor that will tell you that cable is disconnected (which works even with source powered off)
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<libv>
gamiee: but hpd is a 5V binary signal, iirc pulled to ground by the monitor
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<libv>
but i would have to look it up, my memory is not too strong anymore
<swiftgeek>
pulled to 5V on monitor side
<swiftgeek>
5V provided by source
<libv>
i had a hdmi to vga converter with the ad7611, the same chip we are using for the fosdem project, and that adv7611 had been burnt out
<swiftgeek>
but that's one out of possibilities
<libv>
right, that chip pulled hpd to GND, and that crashed the bpi it was attached to, as that maxxed out the usb power supply
<libv>
but since we wanted to test some aliexpress adv7611s anyway, the device served its purpose and was fixed
<libv>
swiftgeek: you have that with multiple monitors?
<swiftgeek>
yeah
<libv>
what allwinner device are you using?
<swiftgeek>
oh that's universal on that side to
<swiftgeek>
*too
<swiftgeek>
a moder monitor won't expose EDID unless it detects a cable
<swiftgeek>
*modern
<swiftgeek>
but allwinner is what pushed me in right direction, as it started outputting on HDMI anyway at preset resolution, and image appeared under message that cable was not detected
<swiftgeek>
xD
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<swiftgeek>
spec doesn't define shell /shielding to be at GND
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<libv>
ah, wrong, it was the +5V pin that was pulled to ground back in september 19
<libv>
covid memory fog, without having actually had covid
<swiftgeek>
yeah HPD pull would be usually just 1kΩ
<libv>
aha, shell is indeed not specified as a return path, which also makes sense
<libv>
at least for dvi
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<hramrach>
virtio bus :D
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<swiftgeek>
gamiee: thx i was looking for something like this for a long time ;D
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<MoeIcenowy>
hramrach: seems to be openamp
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<rm_>
hmm, my Cubietruck doesn't seem to boot anymore
<rm_>
I wonder what could have gone bad after a few years of shelf life
<rm_>
it has a battery, but it appears soldered in (and didn't seem to leak)
<hramrach>
did it stop powering on completely or jsut gets stuck somewhere?
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<hramrach>
You can connect a battery but I don't see one on the board itself
<rm_>
it either doesn't power on the monitor at all, or (rarely) shows the u-boot messages, goes to the kernel, and hangs somewhere afterwards, with nothing on HDMI
<rm_>
also it is troubling that u-boot says 1 GiB of RAM, while the board actually has 2
<hramrach>
it's good idea to connect the serial console and get the u-boot/kernel messages
<rm_>
but maybe that was the case all along and the full RAM is only initialized by the kernel
<hramrach>
yes, I wanted to ask if it always said that
<hramrach>
bu kernel gets to know about RAM from u-boot AFAIK