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Raspberry Pi 5

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Re: Raspberry Pi 5

#761

Post by pseg134 »

tlamponi wrote: post #173
foggywin wrote: post #73

Earlier quoted context omitted.

Did you read the blog post? :) "One of the most exciting additions to the Raspberry Pi 5 feature set is the single-lane PCI Express 2.0 interface. Intended to support fast peripherals, it is exposed on a 16-pin, 0.5mm pitch FPC connector on the left-hand side of the board. From early 2024, we will be offering a pair of mechanical adapter boards which convert between this connector and a subset of the M.2 standard, al…

> Did you read the blog post? :) As you keep spamming this here, did you read the HN Guidelines[0]? > Please don't comment on whether someone read an article. "Did you even read the article? It mentions that" can be shortened to "The article mentions that". [0]: https://news.ycombinator.com/newsguidelines.html

The guidelines mention that.

Re: Raspberry Pi 5

#762

Post by reedlaw »

raytopia wrote: post #752
reedlaw wrote: post #714

Earlier quoted context omitted.

It would likely be similar to gaming on Linux but with the limitations of ARM-only and OpenGL ES 3.1 or Vulkan 1.2. [1] What would be more interesting is an open source micro-kernel and gaming SDK targeting Raspberry Pi. 1. See https://www.pcgamingwiki.com/wiki/List_of_Linux_ARM_games

I think it could avoid some of the issues with gaming on linux because you could focus in on a unified platform and if there was a gaming SDK targeting the pi we might see orginal games being made as opposed to just ports. Also what exactly would a micro-kernel entail? I'm much more familiar with game development than os development.

Most Raspberry Pi Linux distros take around 10 seconds to boot. It can be made faster by using a tiny distribution or something like https://www.linuxfromscratch.org/ but it would be nice to find an OS geared towards gaming.

Re: Raspberry Pi 5

#763

Post by poglet »

jlarcombe wrote: post #727

I know this will sound like a whinge but it's really a shame they removed the audio jack, it was so useful for simple sound/music projects.

So if you need 3.5mm output you need to buy some accessory? That's disappointing - reminds me of what happened with phones.

Re: Raspberry Pi 5

#764

Post by esrauch »

heresie-dabord wrote: post #393
keyle wrote: post #55

This is exciting. I wish this would work without a fan, just with a good cooling system. I say this because I love the idea of a full linux computer without a fan. I'm loving the Apple silicon machines at the moment for this. Perfect silent computing. I wish it came as well in a larger board, with proper HDMI ports. There is a market for silent linux machines, I think! What would be your dream linux fan-less setup?

> What would be your dream linux fan-less setup? I am quite satisfied using the Pi 400, a portable LCD display, and a wireless backlit keyboard.

The Pi400 is already a keyboard isn't it? You use a second separate keyboard with it?

Re: Raspberry Pi 5

#765

Post by dfox »

dmitrygr wrote: post #669
extraduder_ire wrote: post #640

Earlier quoted context omitted.

I think you can have over a hundred different i2c devices connected to the same bus, so it'd get pretty tall if you can power them all. 10-bit i2c (not very common) can do almost a thousand. Although, you'd need specific rules if you wanted to prevent someone just layering up always-on LED boards.

> you can have over a hundred different i2c devices connected to the same bus In theory sure, in a world with zero-inductance zero-capacitance busses and infinite-sink-current drivers. In our reality, however, you'll start having issues and start requiring stronger pullups and lower speeds long before you get to a hundred.

One pretty popular home alarm brand uses I2C as “the bus” with somewhat ridiculously large cable lengths for what was designed as a board/enclosure level cheap serial bus. It is in no way a sane design, but it seems to work.

Re: Raspberry Pi 5

#766

Post by crote »

foresto wrote: post #90

> PCIe 2.0 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter) This could make it appealing for a low-power server, like a home NAS. In previous models, disk I/O had to be over USB, which imposes more CPU load than native SATA, along with various unpleasant quirks typical of USB-to-SATA bridges. Too bad it's only one lane (assuming that's what they mean by x1), but I think that's almost eno…

PCIe 2.0 x1 can do 4Gbps, that should be more than plenty for any NAS - especially considering the ethernet port is 1Gbps.

Re: Raspberry Pi 5

#767

Post by crote »

bmicraft wrote: post #718
marcosdumay wrote: post #695

Earlier quoted context omitted.

> "normal" USB-C power I have no idea what kind of USB-C PSU one can call "normal", but allowing higher voltages would be really good.

"Normal" would be a voltage-current combination, that isn't likely to lead to 10% lost energy just in the cable and connectors alone. 12V @ 2.25A would have been much more sensible: With a 100mΩ cable you'd lose 1.8% instead of 10%

The right choice would've been 9V 2.8A, because it's what USB PD-compliant chargers offer. For a 25W charger powering a 25W device, that's the only combination which is guaranteed to be available.

Using 5V 5A means you have to essentially use the official power brick, because very few third-party chargers support it. It really sucks.

Re: Raspberry Pi 5

#768

Post by heresie-dabord »

esrauch wrote: post #764
heresie-dabord wrote: post #393

Earlier quoted context omitted.

> What would be your dream linux fan-less setup? I am quite satisfied using the Pi 400, a portable LCD display, and a wireless backlit keyboard.

The Pi400 is already a keyboard isn't it? You use a second separate keyboard with it?

Yes, thank you, I omitted that there is also a Pi 4 in the mix.

I do like the Pi 400 and would be happy to see one configured with 8GB. Lovely little machine.

Re: Raspberry Pi 5

#769

Post by crote »

aloer wrote: post #642

5v/5A seems weird. Can normal power supplies even deliver this? One of the big benefits of rpi has always been to reuse power adapters and isn’t that all PD standard today? Higher wattage PD chargers and powerbanks that I have here all work with voltages of 9/12/15 at 3A and 20V at up to 5A

No, it is not part of the USB PD specifications, and the Pi 5 is therefore not PD compliant.

The PD specs require a 25W device to operate at 9V 2.8A. A 25W charger is still allowed to offer 5V 5A and a 25W device is still allowed to prefer it when offered, but it is not allowed to require it.

To make it even worse: at no wattage are chargers required to offer 5V 5A. Even a 100W one (which is required to offer 20V 5A) does not need to offer it, and it is 100% PD compliant if it only offers [5V 3A, 9V 3A, 15V 3A, 20V 5A].

Re: Raspberry Pi 5

#770

Post by crote »

mytailorisrich wrote: post #85
ytch wrote: post #68

Out of curiosity, does 5V/5A USB-C changer common? All of my USB-C Chargers has 5V/3A only.

5V/5A means at least 25W. Plenty of chargers at that level and above on Amazon.

Unfortunately that's not how USB PD works. In PD Land, 25W means 9V/2.8A. A charger is allowed to offer 5V/5A but at no power level is it mandatory, so even a fully USB PD compliant 100W charger which can do 20V/5A is not guaranteed to power the Pi 5.
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