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<Phanos>
Hi
<Phanos>
will a power supply for raspberry pi 4 do for beagle bone black.
<Phanos>
Specifications are 5v/3A
<Phanos>
voltage on power supply is arroung 5.35-5.4v without any load
<zmatt>
it's common for the voltage on a switching power supply to be slightly higher than spec when _completely_ unloaded
<Phanos>
yes I am concerne weather it will burn out the BBB
<Phanos>
because I read somewhere that the spicification of the BBB is arroung 5.25v max
<Phanos>
should I worry?
<zmatt>
the key part here is "when _completely_ unloaded", it should go down once any load is attached whatsoever. regardless, no it shouldn't be a problem
<zmatt>
I think
<Phanos>
I am not sure how much it will go down. It is possible it will stay around 5.3v
<Phanos>
I am asking because last time I used another power supply for another BBB rated arround that voltage after a couple of hours the beagle died
<zmatt>
ouch
<Phanos>
not sure if this was the problem since I was conducting experiments on the I2C bus of that BBB using 5v for the I2C instead of 3.3v but I can not be sure
<zmatt>
okay maybe I'm a bit too optimistic about the quality of random switching power supplies
<zmatt>
oh
<zmatt>
yes that will fry your beaglebone
<zmatt>
none of the I/O is 5V tolerant
<Phanos>
If it stays arround that voltage (5.3v-5.4v) will it be ok?
<zmatt>
not really no
<zmatt>
but then it's also not a USB-compliant power supply
<Phanos>
no it is not.
<Phanos>
also will it work at least for some time so at least I can messaure the voltage to see what the actual values are under load or will it burn out immediatly?
<zmatt>
the PMIC tolerates 5.8 V, but the usb vbus monitoring pins of the processor have an absolute maximum rating of 5.25 V
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<Phanos>
just a note I will be attaching the power supply to supply port not the usb port
<zmatt>
do you maybe have a load resistor to test it with? like, see if attaching 10K or even 100K isn't already sufficient to make it go down below 5.25 V
<Phanos>
if this is relevant
<Phanos>
do not have a load resistor
<Phanos>
should I simply attach a 10k resistor to the 5v? Is thisthe same?
<zmatt>
it's relevant in the sense that that voltage will only appear on a vbus monitoring pin of the processor while the system is powered on (as opposed to the usb power input which will also appear on one while the system is powered off
<zmatt>
yeah I meant just a resistor used as load on the supply, not a special type of resistor of whatever
<Phanos>
ok I will try that but I still need to plug it in in order to test it.
<Phanos>
do you beleive the BBB will survive at first with voltage 5.4v
<Phanos>
?
<zmatt>
you can't just somehow touch the resistor across the supply output and measure the voltage?
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<Phanos>
yes probably you are right
<Phanos>
I will try that
<Phanos>
thanks
<Phanos>
in general I should avoid power supplys that have more than 5.25v correct?
<zmatt>
if they remain above 5.25V when under load, yes
<zmatt>
hmm, maybe 1KΩ would be a better test.. that's still only 5 mA
<zmatt>
though often the voltage will drop under even lighter loads like 10K or 100
<zmatt>
K
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<Phanos>
ok great
<Phanos>
I will try that 1K resistor
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<zmatt>
jkridner[m]: hmm, I just noticed the tda4vm and dra829 datasheets say the pru subsystems are not available on them
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<zmatt>
(as of the latest revisions of those datasheet)
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<zmatt>
the aasrc section was also removed from the tda4vm datasheet
<jkridner>
still there, just now unsupported.
<zmatt>
and now with unspecified timings, since those have been removed from the datasheet?
<zmatt>
(not saying that that's a problem in practice, but it's not ideal)
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<zmatt>
I guess it makes sense with the am752x part number being dropped, evidently TI no longer intends to market the j721 for non-automotive (industrial/broadmarket) applications
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<mawk>
ooo
<zmatt>
lol, I only *just* noticed that freenode committed ritual suicide 3 days ago
<mawk>
yeah the old freenode was kept alive
<mawk>
just, the dns was redirected
<mawk>
also it's easy to takeover channels on the new freenode now, I even did it for one chan I was into
<mawk>
I went into #freenode and said "give me ops" and they did
<mawk>
so I suppose there will be a lot of zombie channels handled by whoever wants it on the new freenode
<zmatt>
apparently the old freenode servers are now down
<zmatt>
or replaced by the new ones
<zmatt>
but yeah, I'm not even going to bother connecting to the "new freenode" again or registering my nick
<mawk>
I was on 80 channels on freenode, now they're all gone
<mawk>
I don't know how many moved, and where they moved, presumably most on libera
<mawk>
but I surely lost a lot of people I was talking to
<zmatt>
I mean, I can understand why freenode wanted to switch their software to InspIRCd, its lead developer clearly loves them: "I reiterate what I have said elsewhere: we (InspIRCd) will not work with the new freenode team and if they turn up in any of our project spaces they will be banned on sight."
<zmatt>
and the answer to raisinbrain as to why RSA isn't used for key agreement (for forward secrecy) is because RSA key generation is slow as fuck
<zmatt>
so noone in their right mind would use ephemeral RSA keys
<zmatt>
RSA isn't slow, RSA *key generation* is slow
<zmatt>
this has to be the most inefficient way to chat ever, lol
<mawk>
lol
<mawk>
yeah
<mawk>
ah oops
<mawk>
well rsa key generation is slow for sure, but RSA itself is slow
<mawk>
no?
<zmatt>
RSA verification is quite fast
<zmatt>
signing is meh
<mawk>
I tried to use ms comic chat as a legit irc client, I don't remember how long I held
<mawk>
probably a day
<mawk>
but it's funnier with several people, because then you can enable some option in the program to prefix every message with special characters understood by the MS chat client
<mawk>
you can customize your emotion and your little character
<zmatt>
if you need to optimize for verification/encryption performance at the expense of signing/decryption performance, RSA-like schemes are still quite attractive (although there are faster variants than RSA proper)
<mawk>
why isn't it mostly symmetric between encryption and decryption?
<mawk>
it's the same kind of modular arithmetic operation in both cases
<zmatt>
decrypt/verify uses small fixed exponent (can be 3), encrypt/sign uses a secret exponent that's basically a random number of the same size as the public key
<mawk>
I see
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<av500>
ha
<zmatt>
ha!
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<tigerxyz>
Hi, Anyway to create VPN based on cellular PPP netowrk?
<zmatt>
why would a VPN care what the underlying internet connection is?
<zmatt>
as long as the packets of whatever type of VPN you use aren't firewalled, you're good to go
<tigerxyz>
Well, Cellular connection is ppp, point-to-point. It can reach out to internet, but how does a client to access ppp device?
<tigerxyz>
For example, the device has a local web server, is there any way my PC to access the web page hosted by the device?
<zmatt>
you're just really confused about how networking works
<tigerxyz>
Try to figure out
<tigerxyz>
VPN can be created based on PPP on linux (debian 10 _
<zmatt>
again, the underlying internet connection has nothing to do with how a VPN tunnel is made
<tigerxyz>
Yes.
<zmatt>
it doesn't matter if it's mobile, cable, fiber, ppp, slip, IP-over-avian-carrier
<zmatt>
the only thing that can cause problems with _some_ VPN protocols is firewalling and/or NAT
<zmatt>
also, "any way" for your PC to access a page hosted on the beaglebone doesn't necessarily require a VPN, a public IP (v4 or v6) address without NAT or firewall getting in the way would also do, though you're probably not going to get that from a mobile provider
<tigerxyz>
Ok, let me ask in a different way. My Home PC has internet service. I can browse internet through my PC. Is there a way that I can access my Home PC from my work
<zmatt>
*usually* your internet router has a public IP that is reachable from anywhere on the internet
<zmatt>
and if you're lucky also an IPv6 prefix
<zmatt>
but that public IPv4 address has to be shared between the router and all devices on your home network, for which something called Network Address Translation (NAT) is used, which is what's making it impossible to reach any specific device on your LAN from the internet
<tigerxyz>
That was I try to figure out. If I have a public service IP, and a private (static) IP, then I can setup a VPN for my home PC, and I will be able to connect to my Home PC from work securely
<zmatt>
for that purpose you can set up port forwarding in your router
<zmatt>
making a VPN to work would be an alternative route of accomplishing something similar
<tigerxyz>
But for cellular case, I don't have access to service provider's router
<tigerxyz>
The PPP connection for cellular doesn't have 'real' public service IP. So there is no way I can do it.
<zmatt>
yeah for the cellular case you'll want to have it connect to a central server / access point that gives you whatever access you need to your device
<zmatt>
a VPN would be one option
<zmatt>
or just a connection to a server that passes requests to the device
<zmatt>
depends on the use case
<tigerxyz>
My Purpose is that If I can access my device through internet using cellular network, it will be nice. much easier for device setup and maintenance.
<zmatt>
are these devices (eventually) going to be out in the field, where a third party could perhaps gain access to them?
<zmatt>
if so, do think about the security implications of leaving VPN login credentials to your work on these devices
<tigerxyz>
Currently, my device is uploading data to cloud database. But if any wrong, I cannot service the device. Because I have no way to connect to the device, even though it has 'real' connection
<zmatt>
yes I understand what you want to do, I'm just saying be mindful of how you achieve this goal
<tigerxyz>
Security is a concern for sure
<tigerxyz>
I think currently based on the way setup for ppp network by the cellular it is not able to do what I am looking for. I believe making it possible has real benefits and implications
<zmatt>
if you're going to ignore what I said repeatedly, why do you ask questions?
<zmatt>
for the final time: that your underlying internet connection is made via PPP is _IRRELEVANT_
<tigerxyz>
I didn't ignore what you said, at least no intention. I might miss something while typing
<tigerxyz>
No, PPP is the cellular network on my device
<zmatt>
I know that
<tigerxyz>
So if I want to access the device, I need to create some kind of way using the PPP connection available on the device
<zmatt>
... which we've just discussed
<zmatt>
you know what, I'm done with you, maybe someone else will help you, afk
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<set_>
Hello...what should I do next? I think I am maturing slowly away from the funny posts.
<mattb0ne>
lol i will believe it when i see it
<set_>
Should I try to paraphrase and actually hand out knowledge from readings?
<mattb0ne>
i think you and zmatt should launch a sitcom
<set_>
I am asking b/c...my funny posts are maybe getting the incorrect attention you all do not deserve.
<set_>
So, in retrospect and looking back, I will do better w/ my non-funny posts.
<set_>
More science, less "do it this way."
<set_>
I mean it. There is so much science in the background of BBB, electronics, and generalized software/hardware. I am sure I can make up something better than what i have been doing.
<set_>
Maybe one could put me on a path? For instance, send in what you want people to know and I will research it, test it, post it, and sit and wait for eternity.
<set_>
Serious!
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<set_>
mattb0ne: !
<set_>
Good idea. He can yell at me for me being me. I can then reiterate that it is not my fault for me being me.
<set_>
?
<set_>
"I was born this way!" All jokes aside, I need a PATH, purpose, or some avenue to take here.
<set_>
I mean...if there was something that no one else wants to do, send it in. I will attempt it!
<set_>
Forget it. I will take some notes like GenTooMan says, attempt to make sense, and then post it and have it resolve around the BBB and some source/hardware.
<set_>
to fruition!
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<veremitz>
good luck, set_ ! your enthusiasm will take you far, I'm sure :)
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<set_>
Thank you very kindly. I will keep trying!
<set_>
See...here is the issue. I talk like a very slow individual but when I type, I make sense quicker (sort of).
<set_>
Anyway, I think my learning on electronics has come to an inferior state which I will take into consideration and change it accordingly. Boy!