New Raspberry Pi Model B+ • Hacker News Board

Re: New Raspberry Pi Model B+

#171

Post by TorKlingberg » Wed, Mar 14, 2018, 4:36 PM UTC

pi-rat wrote: post #73

cuonic wrote: post #11

Earlier quoted context omitted.

PoE support has always been available with a seperate PoE Hat [0], I found it to be a strange announcement. 0: https://coolcomponents.co.uk/products/pi-poe-switch-hat-powe...

This is much cleaner[1] though. It seems to just do 48/24v -> 5v via 4 pins. No more ethernet pass-through. [1]: https://www.raspberrypi.org/app/uploads/2018/03/770A6339-161...

Yes, the old PoE hats had two RJ45's on them, and you needed a short cable between that and the Pi. It's unfortunate they had to put a fan on the new hat though.

Re: New Raspberry Pi Model B+

#172

Post by AdrianoKF » Wed, Mar 14, 2018, 4:38 PM UTC

boris wrote: post #104

AdrianoKF wrote: post #30

Earlier quoted context omitted.

As far as I can remember, the system-on-chip architecture limits the maximum amount of RAM to 1 GB (I'll try and find an official source, it's probably somewhere in the BCM283x peripherals documentation). Not to say Broadcom couldn't spin a newer revision of the SoC with a different internal architecture, but for now it seems that >1 GB of RAM would require substantially more effort than just swapping the DRAM module…

Right, RAM is part of the SoC... that probably makes the idea pretty much a no-go.

The RAM was only integrated on the SoC on earlier models (called a package-on-package, PoP -- see https://elinux.org/RPi_Hardware#Components)

Later versions (I think starting with RPi 2) have a separate DRAM chip on the bottom side of the PCB.

Re: New Raspberry Pi Model B+

#173

Post by ChuckMcM » Wed, Mar 14, 2018, 4:40 PM UTC

I am always impressed at how people can buy a fully functional computer for $35. That said, as an engineer I often cringe at the compromises made. Like "Gigabit Ethernet over USB 2.0". Since the top bit rate of USB2.0 is 480Mbps and GbE is 1250Mbps, USB 2 only has about 1/3 the bit rate to support it.

Now it will be faster than 10/100 ethernet connections but don't expect to send a 100 megabytes/second through it.

Re: New Raspberry Pi Model B+

#174

Post by floatboth » Wed, Mar 14, 2018, 4:44 PM UTC

lolikoisuru wrote: post #38

jimmies wrote: post #16

PXE booting is sweet. I develop an OS (Crankshaft) for the Pi, and a lot of times it just has been waiting to write a new OS to the SD card, waiting, plugging it in, realizing I forgot to do something, so I had to repeat. Each time it was 15 minutes of waiting. Pulling the card out and putting it back in, especially with the ribbon cable on the way (and a case too) has been really painful. PXE boot is going to solve…

FYI PXE booting has been possible for a while now: https://www.raspberrypi.org/documentation/hardware/raspberry...

It's extremely unreliable on the Pi 3. I gave up on full diskless (cardless?) boot and just put u-boot on an SD card.

Re: New Raspberry Pi Model B+

#175

Post by filleokus » Wed, Mar 14, 2018, 4:46 PM UTC

I'm always so impressed with the supply chain of the Raspberry PI foundation. I woke up today, saw the HN story, and during lunch went to a local store and picked one up. I live in a small-ish town in Sweden. I know it's not like a iPhone release or whatever, but still impressive that they manage to get it out to my local store on release day.

Re: New Raspberry Pi Model B+

#176

Post by floatboth » Wed, Mar 14, 2018, 4:47 PM UTC

lloeki wrote: post #27

qalmakka wrote: post #17

"Just over two years ago, we released Raspberry Pi 3 Model B. This was our first 64-bit product" Very unfortunate that their in-house developed and promoted OS ("Raspbian") only supports armv7, thus leaving the vast majority that doesn't know about the existence of (or how to use) archlinux ARM an the likes with a 32 bit os. Am I the only one that doesn't get the sense out of this here? Debian supports Aarch64 out of…

The problem is VideoCore, as the Broadcom firmware and closed libraries are 32bit only. You can very easily† pop in an ArchLinux ARM AArch64[0] in there and notice that you only get a very basic framebuffer, sound is just not working at all, and the bootloader is quite incomplete. So ARMv7 it is for me, even with ArchLinux ARM and in spite of my wish for better FOSS support from Broadcom or in Linux mainline. † I fin…

> only get a very basic framebuffer

You get 3D accelerated Wayland or Xorg with the open source VC4 driver!

Re: New Raspberry Pi Model B+

#177

Post by ac29 » Wed, Mar 14, 2018, 4:49 PM UTC

izacus wrote: post #130

yipbub wrote: post #88

Earlier quoted context omitted.

That there are other OSes that do support it mean that it is a feature.

Which OSes are that? I couldn't find a single one.

Arch Linux ARM will do AArch64: https://archlinuxarm.org/platforms/armv8/broadcom/raspberry-...

Re: New Raspberry Pi Model B+

#178

Post by mrsteveman1 » Wed, Mar 14, 2018, 4:49 PM UTC

mattbierner wrote: post #15

I’ve been using Pis to stream video from webcams for various experiments and the built-in wireless on the 3 and Zero W was game changing. All the usb WiFi adapters I had tried previously were unreliable or had too much latency. Very excited to try out the improved wireless on this board

> the built-in wireless on the 3 and Zero W was game changing

Definitely, the Pi Zero W is now my go-to controller for almost anything that needs one. The fact that Microcenter frequently sells them for $5 seals it.

I pair them with a $15 aMLC (MLC in SLC mode) industrial MicroSD card[1], and they've been rock solid, no FS corruption on power loss, no Wi-Fi drop outs.

The ability to add the Pi Camera board and have a tiny full HD networked camera with trustworthy "firmware" is a killer feature though, pre-made IP cameras at any price tend to have outdated insecure or even malicious firmware that may or may not be replaceable.

[1] https://www.digikey.com/product-detail/en/atp-electronics-in...

Re: New Raspberry Pi Model B+

#179

Post by floatboth » Wed, Mar 14, 2018, 4:52 PM UTC

gambiting wrote: post #95

DoubleMalt wrote: post #18

2GB of RAM would've been more important to me than all the listed changes.

For this(and other) reason, the Asus Tinker Board looks like the superior choice, for very little more money than the Pi3: https://www.asus.com/uk/Single-Board-Computer/Tinker-Board/

ROCK64!

http://wiki.pine64.org/index.php/ROCK64_Main_Page

4 gigabytes of LPDDR3. USB 3. GbE. eMMC. Onboard SPI flash. Unfortunately Mali GPU, but lima is actively developed now…

Re: New Raspberry Pi Model B+

#180

Post by floatboth » Wed, Mar 14, 2018, 4:54 PM UTC

sp0ck wrote: post #148

What I'm missing is on board flash. Even 512MB would be such useful for many usage scenarios to put OS there. SD cards are biggest source of problems on long run RPi's without some tweaking. There are almost none SBC with built in flash (BeagleBone is shiny exception).

Most Pine64 boards (including ROCK64) have a little SPI flash chip you can flash U-boot to, and a socket for little eMMC modules.