thyristan
Joined 2 years ago
Karma
859
Submissions
354
Member since
Aug 7
Recent submissions
Comment · 2 months ago
The purpose of Android for Google is to push users into paid services, Google search, collect some play store fees and some data. None of that actually requires Android to be really open. Just saying something about "open" works as advertisement though...
Comment · 2 months ago
Wikipedia (https://en.wikipedia.org/wiki/List_of_open-source_mobile_pho...) lists /e/OS, CalyxOS, IodéOS, LineageOS, postmarketOS, Ubuntu Touch, the latter two being non-Android, the rest Android derivatives on Fairphone 5. Fairphone 6 has only /e/OS and IodéOS listed at the moment, but that will probably change after some time on the market.
There are also various reports of things like running e.g. Fedora on an FP6, https://www.notebookcheck.net/Fairphone-6-turns-into-a-Linux... or Debian on FP4/5, but those generally aren't something that is usable due to lacking support for basic things like calls.
Comment · 2 months ago
Fairphones are easy to unlock, repairable, have a long lifetime and offer a variety of different operating system distributions.
Comment · 2 months ago
Theoretically, you can define systems of measurement where a lot of seemingly separate things fall on the same units and dimensions. There are "natural units" in physics where you take the fundamental nature of particles and relativity into account and make some convenient choices for some physical constants such as the speed of light c := 1. Then the speed becomes dimensionless, length and time have the same unit and dimension (a length of 1eV is a time period of 1eV), and almost all units are simply derived from a measurement of energy (electron volt, not as basic as people would like, but useful enough).
Comment · 2 months ago
> Next time you are measuring traffic to your website consider using the appropriate SI unit for measuring requests per second: the Becquerel.
Great idea, I will definitely do this!
Comment · 2 months ago
In a very awkward way: rad is m/m, which is 1...
Comment · 2 months ago
> The individual wasn't the one who truly decided the essential means and purposes beyond personal use
The user is supposed to have read Meta's terms and conditions and agreed to them. Of course nobody does that, but that doesn't absolve of the responsibility, it rather means that the user who uploads stuff to Meta does things in full knowledge and willingly or carelessly. It just might make Meta liable as well, because naturally their terms were sneaky, hidden, unclear and probably illegal.
And I'd guess that Meta Ireland has been sued often enough that they have some export clause deep in their conditions as well, which the user should also have read and agreed to.
Comment · 2 months ago
> While recording by these might not always implicate GDPR directly (as it might be exempted under household exemption or the broader allowances given for journalistic purposes)
I'd guess that the glasses first transfer the recordings to Meta who process and store them abroad for various commercial purposes. That way of working can never fall under the household or journalistic exemptions. And per GDPR the owner of the glasses is on the hook for whatever Meta is doing, because the owner is (by GDPR) contracting Meta to do data processing for him/her.
Comment · 2 months ago
That's the first search engine hit I've pasted. The cheap ones that work just as well are single-digit prices. And usually there is one in every toolbox on the shop floor.
Edit: if you need proof, 2 for 6.50€, shipping included: https://www.ebay.de/itm/277671545941
Comment · 2 months ago
You are right.
Not an LLM problem, just an undecaffeinated meat brain and some faulty memories. I've misread 'When PS=0, the page table address field represents the physical address of the page table that manages the four megabytes at that point.' to mean that when PS=1, the address isn't physical. But PS is page size... And I somehow remembered that you could induce pagefaults when walking the page tables...
Sorry.
Comment · 2 months ago
> Page tables are physically addressed
Nope. Not on x86. You can use either physical or virtual addresses at your choosing. Consumer OSes use virtual ones, so you can swap out page tables (yes, really!). See https://wiki.osdev.org/X86_Paging "Page directory".
Comment · 2 months ago
Yes, it is.
All the siblings might talk a lot about "but ruggedized!", "but realtime!", "but supported!".
But in many cases, it is just a case of vendor lock-in. Ruggedized is just a casing and decoupled I/O-ports, you can get that for your Raspberry Pi. Realtime is a concern, but modern PLCs aren't really realtime anymore. Those are usually some big multicore non-realtime ARM, plus some small realtime-capable I/O-processors that do the really time-critical stuff. Or even just a CPLD to implement some trivial ladder logic cycles. Support matters, but if your PLC vendor goes bankrupt you've drained a few millions. Might be better to get something cheap where you can just stock up a few hundred replacement parts for cheaper.
That's why actually, a lot of smaller PLCs are Raspberry Pi CMs now. The vendor won't tell you, but if you open them up, you'll see.
And the big customers also wised up to the PLC scam and are now moving towards putting their control tasks on standard x86 hardware in the shop floor basement plus realtime ethernet with cheap I/O extenders on the shop floor. Which is why the big PLC vendors now try to sell "virtual PLC" to those customers, so they get at least a little money instead of none ;) https://www.siemens.com/en-us/products/simatic/s7-1500v/
Comment · 2 months ago
The PLC is usually in a control cabinet that can be opened by a control cabinet key:
https://www.knipex.de/schaltschrankschluessel?v=2921
Real locks in such systems are rare, sometimes even disallowed. Usually, a lock with a real key is only used to temporarily prevent switching on a machine during maintenance or such.
Comment · 2 months ago
Depending on his interpretation of the rules about trapped instructions, one could just build a loop in the x86 page tables. Those are usually a tree linked by pointers, and any page table lookup can create another page fault that creates another lookup that...
Leads to x86 page table MMU magic being turing complete: https://github.com/jbangert/trapcc
And the simplest thing you can do on such a system is just to loop indefinitely, thus creating a simple instruction with a memory access (mov or anything, doesn't really matter, even the instruction fetch for a nop would work) to take infinite time.
Comment · 2 months ago
We even had open APIs for every bank in Germany, in the form of HBCI and FinTS. With fancy things like optional RSA smartcard auth. The EU killed it all in the name of "omg, security!" (a total bullshit argument if you've ever looked at the specs), now with the new PSD2 the only ones getting proper API access are lots of shady payment providers, credit databases, data brokers and the like...