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05:22
<
wens >
MoeIcenowy: found a 10" IPS A64 tablet on TaoBao for 229 RMB . sounds too good to be true
05:26
<
lvrp16 >
willmore: that's a great combo
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<
gediz0x539 >
wens: can i have a link of it? :P
06:17
<
wens >
blah, getting weird visible noise on the LCD with the fbgradiant program
06:18
<
KotCzarny >
dithering?
06:24
<
wens >
no, it's something else
06:24
<
wens >
might be a loose connection since I reattached the ribbon cable a few times
06:25
<
wens >
the noise is still there even if I enable dithering to smooth out the gradiants for the 6-bit panel
06:27
<
KotCzarny >
electric noise?
06:36
<
KotCzarny >
as in unstable clock
06:37
<
wens >
it looks like a dancing flame graph
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<
gediz0x539 >
wens: thanks
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<
corecode >
i'm looking at the A64 Memory I/O Power number, and it says 800mA max
10:05
<
corecode >
is that a realistic number?
10:06
<
corecode >
Micron DDR3 chips quote between 132mA-217mA max current
10:07
<
corecode >
800mA seems very high
10:07
<
KotCzarny >
maybe accounts 4 chips?
10:09
<
corecode >
ah you mean higher capacitance to drive?
10:09
<
corecode >
it's also a max number and not typ
10:10
<
KotCzarny >
just a guess, might be totally wrong
10:10
<
corecode >
what would you pick as typ current
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14:36
<
corecode >
A64 VCC-USB is recommended typ 3.0V, but the reference design uses 3.3V -_-
14:37
<
corecode >
same for efuse
14:39
<
willmore >
lvrp16, the memory or crypto? :)
14:40
<
hell__ >
corecode: well, 3.3V is rather common. does the hardware tolerate 3.3V?
14:41
<
hell__ >
oh, 3.3V is the limit
14:42
<
hell__ >
efuse, PLL and RTC won't be happy
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14:42
<
corecode >
i think 3.6V is absolute maximum rating
14:42
<
corecode >
i wonder whether i should add an rtc battery
14:44
<
hell__ >
rtc battery... on desktops/laptops there's a dedicated RTC battery because all other power sources can be lost by design
14:44
<
hell__ >
though on some laptops with internal batteries, I've seen boards without a RTC coin cell (they rely on the main battery being always there)
14:45
<
hell__ >
on phones/tablets, the battery might be removable but it's most likely to be installed at all times
14:45
<
corecode >
yea my design doesn't come with a battery
14:46
<
hell__ >
but for SBCs (e.g. orange pi zero) it makes sense to add a RTC battery: same story as on x86 desktops
14:46
<
corecode >
yea but all these sbcs don't have batteries
14:48
<
hell__ >
that's what I said, it makes sense to add one
14:48
<
corecode >
mine is an industrial control application
14:49
<
corecode >
i'm having trouble finding a nice small battery tho
14:51
<
corecode >
what do people even use for this?
14:51
<
corecode >
i've seen small coin cells
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<
corecode >
also unclear what the minimum voltage is for VCC-RTC
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<
corecode >
so, how do i test whether the rtc works at a voltage?
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19:31
<
lvrp16 >
willmore: I mean your memory + cpu combo
20:01
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20:09
<
willmore >
lvrp16, I'm happy with it so far.
20:09
<
lvrp16 >
willmore: thank god for AMD, otherwise we'd still be paying 2000 for 8 cores
20:10
<
willmore >
Though used servers are pretty good deals--if you're not stuck on power efficiency. :)
20:25
<
lvrp16 >
willmore: 1 watt is $1 per year so 150w more is $150 a year, if you use it for 3 years, that's $450.
20:26
<
lvrp16 >
headless ryzen 3700x uses 40W or so idle vs 200W for your typical server at idle
20:28
<
willmore >
If it's idle, then speed doesn't matter, might as well use an OrangePi. :)
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21:19
<
buZz >
my atom homeserver uses ~32W at max load
21:19
<
buZz >
8 core, 3tb, 32gb ram, running ~25 LXCs
21:19
<
buZz >
~10-15W idle
21:20
<
buZz >
its never idle though
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<
lvrp16 >
buZz: try to build android on it :P
21:53
<
buZz >
shouldnt be able to get past ~32W
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<
lvrp16 >
buZz: good trade off for a month of build time :D
21:59
<
willmore >
buZz, what's LXC?
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21:59
<
buZz >
> LXC (Linux Containers) is an operating-system-level virtualization method for running multiple isolated Linux systems (containers) on a control host using a single Linux kernel.
22:00
<
buZz >
should work on ARM aswell :)
22:00
<
willmore >
Ahh, okay, thanks. I've never done any kind of VM work other than testing stuff in QEMU from time to time.
22:01
<
buZz >
np :) its not a real VM
22:01
<
buZz >
you cannot run a different kernel in a LXC
22:01
<
buZz >
its more like docker or chroot
22:01
<
buZz >
but segmented better
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