rellla changed the topic of #linux-sunxi to: Allwinner/sunxi /development discussion - did you try looking at our wiki? https://linux-sunxi.org - Don't ask to ask. Just ask and wait! - https://github.com/linux-sunxi/ - Logs at http://irclog.whitequark.org/linux-sunxi - *only registered users can talk*
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<smaeul> "RTCLDO: fixed 3.0V or 1.8V, IMAX=100mA, always enable" "VCC_RTC is fixed at 1.8V too for AXP803"
<smaeul> there's an LDO for RTC-VIO that goes up to 1.4V (default 1.1V), so you probably don't want to go much below 1.8V
<smaeul> corecode: the absolute minimum is when the RTC starts losing data, which the A64 manual suggests is around 1.0V
<smaeul> "Note: General purpose register 0~7 value can be stored if the VCC-RTC is larger than 1.0v"
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<smaeul> I don't remember ever seeing an RTC battery other than a CR2032
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<wens> smaller variants :p
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<corecode> smaeul: my measurements showed that 1.5V works, 1.0V didn't
<corecode> the current is surprisingly high - around 70uA at 3.0V
<corecode> but i mistakenly applied 3.7V for a few seconds
<corecode> so maybe that zapped something
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<zopter> hi, could please somebody tell me how to dump the nand chip of my tablet device? screen is broken ... it has a a20 and im already in FEL mode -> i guess i need to switch to FES mode to dump nand chip?
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<zopter> hi, could please somebody tell me how to dump the nand chip of my tablet device? screen is broken ... it has a a20 and im already in FEL mode -> i guess i need to switch to FES mode to dump nand chip?
<KotCzarny> just boot legacy kernel and own filesystem?
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<zopter> how to boot legacy kernel ?
<KotCzarny> but might be easier to just boot some legacy linux for a20 from sdcard
<KotCzarny> you would need to probably extract fel first though
<KotCzarny> s/fel/fex/
<zopter> ok.. i need an linux image for a20 and write it to sdcard, then boot from sdcard
<zopter> but the screen is broken, i have an old tablet
<zopter> so i need an image which opens ssh or sth
<KotCzarny> yeah, and probably to set up usb-networking
<zopter> ok, but how to find the correct image?
<zopter> could this one work? https://romanrm.net/a10/debian
<KotCzarny> i guess any legacy a20 image, but you need fex from your device
<zopter> what to do with fex
<KotCzarny> its a small file that describes your device
<zopter> and i need for booting the image?
<zopter> just writing image to sd card wont be enought to boot it?
<KotCzarny> it should boot, but might not work correctly
<zopter> all i need is to dump the nand chip
<zopter> so with some luck it will boot and setup ssh
<zopter> i connect and maybe can access nand as block device
<zopter> what i also read is when i can switch to fes mode - i could dump partition.. but i also need an image for swichting to fes mode
<zopter> will this overwrite the nand chip? or what happens when i try to switch to fes mode with a given image
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<mru> something weird is happening here
<mru> my A20 device is suddenly reporting hdmi as connected when it's not and vice versa
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<mru> mripard: ^^ any idea?
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<mru> ah
<mru> thanks
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<plaes> wens: how does the HDMI polling work now?
<wens> plaes: the drm core polls every so often. we were adding extra polling
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<plaes> ah.. ok
<wens> I mean extra cycles consumed due to the iopoll stuff
<plaes> how often does core poll?
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<plaes> I had the issue where quickly switching displays didn't fetch EDID for new monitor
<plaes> because it never detected that monitor was removed
<mru> does it _ever_ fetch edid for a new monitor?
<plaes> it does
<mru> seems to me you're stuck with whatever video mode the first monitor it sees likes
<mru> if it fetches the new edid, it certainly doesn't do anything with it
<wens> plaes: I believe it's 10 seconds # drivers/gpu/drm/drm_probe_helper.c
<wens> mru: for the console?
<mru> for anything
<mru> if I switch the monitor, it stays with the old video mode
<wens> I don't think the console ever switches resolution. never tried X
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<mru> well, that's stupid
<wens> I always thought that was an existing limitation in fbcon
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<mru> then what's the fbset command good for?
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<KotCzarny> include fbset source in hdmi-hpd driver!
<KotCzarny> ;)
<mru> why can't it do whatever it does the first time every time?
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<mru> hmm, seems I was wrong about the details
<mru> it does update the video timings
<mru> but the framebuffer resolution stays the same
<mru> and the new video mode is limited to not be wider than the first one seen
<mru> oh dear, I killed the kernel
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<mru> well, that's a fun bug
<mru> unload sun4i-drm-hdmi while the framebuffer is in use, then kill the process that was using it
<mru> instant kernel panic
<montjoie> yes, lot of drm module are not rmmod-proof
<montjoie> in my testsuite I play modprobe all then rmmod all. lot of fun
<mru> it works if nothing is using the framebuffer
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<plaes> yeah, it's somewhat better now :)
<plaes> a while ago it panicked immediately after rmmod
<mru> this is annoying
<mru> I can resize the framebuffer as long I don't try to make it wider than the first display seen
<mru> is there some way to have a little extra width allocated?
<mru> now there is :)
<wens> mru: could you report a tested-by for the patch I posted?
<mru> the hpd thing?
<wens> yeah
<mru> done
<mru> hah, a kernel patch and a shell script later, resolution now adapts to the monitor
<KotCzarny> open source ftw ?
<mru> even better, getting paid to work on open source
<KotCzarny> :)
<mru> of course someone will probably say that I should be doing some complex dance with "modesetting" blah-blah rather than 3-line patch
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<willmore> smaeul, I've seen a lot of supercaps used for RTC supplies. So, max 2.5V, no minimum.
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