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by technix
Mon Jun 03, 2019 5:25 am
Forum: Advanced users
Topic: Does the Pi support booting from GPT drives?
Replies: 2
Views: 230

Does the Pi support booting from GPT drives?

If I want to USB boot my Pi from a 6TB external USB hard drive, or if in the future a 4TB microSD card appeared on the market (likely very soon given Moore's Law) the Pi will need GPT boot support in order to make full use of it. So, can Pi boot from GPT? If not, does this seem like a good idea for ...
by technix
Fri Mar 01, 2019 4:15 pm
Forum: HATs and other add-ons
Topic: TV HAT: does it have an SDR mode?
Replies: 1
Views: 512

TV HAT: does it have an SDR mode?

SDR mode means whatever internal processing in the RF chip is bypassed and raw samples of digitized RF or IF data is being pumped directly into the main processor. The RTL-SDR makes use of an internal test mode of RTL2832U chipset which pumps raw IF samples over USB, making it useable as an SDR. SDR...
by technix
Fri Mar 01, 2019 4:05 pm
Forum: HATs and other add-ons
Topic: Idea: an alternative PoE HAT.
Replies: 4
Views: 455

Re: Idea: an alternative PoE HAT.

I have seen some YouTubers bashing on the PoE HAT for its various design problems, especially the fault with USB. Since I am planning on using PoE with one of my Pi's, I am inclined to cook up my own PoE HAT here instead of using the official one. I am using TI TPS23753 PoE controller, an external ...
by technix
Wed Feb 27, 2019 4:35 pm
Forum: HATs and other add-ons
Topic: Idea: an alternative PoE HAT.
Replies: 4
Views: 455

Idea: an alternative PoE HAT.

I have seen some YouTubers bashing on the PoE HAT for its various design problems, especially the fault with USB. Since I am planning on using PoE with one of my Pi's, I am inclined to cook up my own PoE HAT here instead of using the official one. I am using TI TPS23753 PoE controller, an external M...
by technix
Mon Dec 03, 2018 4:43 pm
Forum: General discussion
Topic: Suggestion: mounting holes around the CPU
Replies: 29
Views: 1383

Re: Suggestion: mounting holes around the CPU

If you guys can make sure all future revisions of the Pi adhere to some kind of layout standards - for example the processor always stay centered at the same place as the Pi3B+ and some paths from the existing mounting holes to the CPU chip is guaranteed to be kept clear of components, this whole th...
by technix
Mon Dec 03, 2018 4:33 pm
Forum: Off topic discussion
Topic: Suggestion: high speed pin multiplexeres
Replies: 4
Views: 1069

Re: Suggestion: high speed pin multiplexeres

Please stop posting "What I think should be in the next Pi" threads. The next Pi is already designed, the SoC was speced two years ago. Even the next next Pi feature set is defined. We do know what we are doing. Most of the the time. What I am hoping for is that this kind of idea can enter the pipe...
by technix
Mon Dec 03, 2018 12:06 pm
Forum: General discussion
Topic: Suggestion: mounting holes around the CPU
Replies: 29
Views: 1383

Re: Suggestion: mounting holes around the CPU

I suspect that there is no room for anything like that - the track routing in that area is horrendous enough as it is. And not entirely sure it's necessary. Just sticking a heatsink on should be more than adequate. If delidding s involved, mounting holes will be necessary, since there is no way you...
by technix
Mon Dec 03, 2018 12:00 pm
Forum: Off topic discussion
Topic: Suggestion: high speed pin multiplexeres
Replies: 4
Views: 1069

Suggestion: high speed pin multiplexeres

This is an idea I have been cooking for a while, intended for the next revision of the SoC. The high speed pin multiplexer allows switching several high speed signal pins around, making room for additional features and redefinition of some I/O pins without sacrificing compatibility. Older software i...
by technix
Mon Dec 03, 2018 11:29 am
Forum: General discussion
Topic: Suggestion: mounting holes around the CPU
Replies: 29
Views: 1383

Re: Suggestion: mounting holes around the CPU

I suspect that there is no room for anything like that - the track routing in that area is horrendous enough as it is. And not entirely sure it's necessary. Just sticking a heatsink on should be more than adequate. If delidding s involved, mounting holes will be necessary, since there is no way you...
by technix
Mon Dec 03, 2018 10:19 am
Forum: General discussion
Topic: Suggestion: mounting holes around the CPU
Replies: 29
Views: 1383

Suggestion: mounting holes around the CPU

As the title suggests, I would like to suggest adding mounting holes around the CPU in the next revision of the Pi. Those holes would allow easy mounting of an aftermarket cooler on the CPU, potentially improving the thermal performance of the processor significantly, and allow the use of advanced t...
by technix
Mon Mar 20, 2017 4:15 am
Forum: General discussion
Topic: Pi (4) in the sky: my ideas and suggestions for the Pi 4
Replies: 13
Views: 2353

Re: Pi (4) in the sky: my ideas and suggestions for the Pi 4

Here is a list of features I wish to see in a future Pi revision. * 64-but kernel That can--and has been--done with the Pi3B and Pi2B2. The RPF isn't likely to release one any time soon though for two reasons. The first (as confirmed by those that have built 64-bit kernels) is that there is very li...
by technix
Mon Mar 20, 2017 12:13 am
Forum: General discussion
Topic: Pi (4) in the sky: my ideas and suggestions for the Pi 4
Replies: 13
Views: 2353

Pi (4) in the sky: my ideas and suggestions for the Pi 4

Here is a list of features I wish to see in a future Pi revision. * 64-but kernel We already have a 64-bit core. Why let the extra bits in registers (and the extra registers) lie dormant? * More RAM The current barrier against adding extra RAM is the memory bus itself. But since we already have a 64...
by technix
Mon Oct 10, 2016 4:00 am
Forum: Raspbian
Topic: Raspbian Jessie (64bit) for RPi3?
Replies: 145
Views: 131542

Re: Raspbian Jessie (64bit) for RPi3?

So far I have sorted out a technical solution to port Raspbian to 64-bit with minimal effort: The kernel itself is a full-blown AArch64 Linux kernel, with one concept and one flag on mmap(2) ported over from AMD64 architecture. No change needed to VC code Minimal change to VC driver stack to solve t...
by technix
Fri Jun 24, 2016 6:18 pm
Forum: Other projects
Topic: Mega Rack of Compute Modules
Replies: 5
Views: 1868

Re: Mega Rack of Compute Modules

Is it -at least theoretically- possible to use a wide bandwidth interconnect between 2 CMs? All those Pi clusters I see floating around are using ethernet. Just wondering. I wonder which interface is faster, SDIO or USB 2.0. Or if the GPU firmware can be modified and the DSI/CSI hardware can be use...
by technix
Thu Jun 23, 2016 4:01 am
Forum: General discussion
Topic: Equivalent of P5 in Pi 3 B GPIO
Replies: 5
Views: 2590

Re: Equivalent of P5 in Pi 3 B GPIO

Those are somewhere on the 40-pin GPIO header.
by technix
Thu Jun 23, 2016 3:59 am
Forum: Other projects
Topic: Mega Rack of Compute Modules
Replies: 5
Views: 1868

Re: Mega Rack of Compute Modules

jamesh wrote:The next CM will use the 2837, not the 36, so Armv8 64 bit cores, plus associated NEON.

Should make a half decent cluster!
For those BCM2837 clusters I would really like to see a 64-bit kernel being used instead of a 32-bit one.
by technix
Wed Jun 22, 2016 6:47 pm
Forum: General discussion
Topic: Raspberry pi 3 as USB device
Replies: 4
Views: 3943

Re: Raspberry pi 3 as USB device

For Pi 3, sadly you can't (unless you add another slave port somewhere else, for example on the SPI bus.) If you have a Model A, Pi Zero or Compute Module though, you can do this. You can use chips like FT121 to add a USB slave port to the SPI bus directly, or use a USB-capable microcontroller as an...
by technix
Wed Jun 22, 2016 6:43 pm
Forum: Other projects
Topic: Mega Rack of Compute Modules
Replies: 5
Views: 1868

Mega Rack of Compute Modules

TL;DR: A big rack full of Raspberry Pi Compute Modules, probably thousands of them, forming a thousand-node cluster. This is a project involves designing minimalistic backplanes for Compute Modules with just enough connectivity. The resulting project is a server rack filled with Compute Modules to ...
by technix
Fri Dec 04, 2015 5:43 pm
Forum: General discussion
Topic: Raspbian Jessie Lite now available
Replies: 55
Views: 194318

Re: Raspbian Jessie Lite now available

Finally an official Raspbian Server. Although preinstall a LAMP or LNMP stack out of the box with a small script setting up a self-signed SSL certificate can be an nice addition, as people can start coding their IoT stack with proper security from the get-go.
by technix
Fri Oct 23, 2015 1:19 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: Dump a SPI NOR ROM chip
Replies: 2
Views: 986

Dump a SPI NOR ROM chip

The chip in question is the MX25L3205D I pulled out of a broken motherboard, holding the BIOS. I would like to dump it but I don't trust my universal programmer since it is a 3.3V-only part. So Raspberry Pi came to my mind. I would like to know if there is any pre-existing driver for such chips (so ...
by technix
Mon Apr 06, 2015 6:07 pm
Forum: C/C++
Topic: How long does kernel builds take for you guys?
Replies: 1
Views: 898

How long does kernel builds take for you guys?

This is actually my first time attempting building a kernel in a long time. Such builds used to take me hours to complete, and now I got this when cross-compiling the kernel in an VM on my server: $ time make ARCH=arm CROSS_COMPILE=/usr/local/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnu...
by technix
Mon Apr 06, 2015 5:43 pm
Forum: Off topic discussion
Topic: Shift registers
Replies: 2
Views: 4806

Re: Shift registers

Actually there is a 74x164 driver that will also take a *595 on SPI bus.

When I built my audio-optimized kernel I also enabled that as a module, just for fun.
by technix
Wed Mar 11, 2015 7:08 pm
Forum: Networking and servers
Topic: Raspberry Pi 2 as replacement for server
Replies: 25
Views: 13792

Re: Raspberry Pi 2 as replacement for server

I have an Raspberry Pi 2 at my dorm as the main router, switching packets between a 150Mbps Wi-Fi adapter, 100Mbps Ethernet and my 10Mbps Internet connection. The old Raspberry Pi model B+ did a great job servicing all the Internet traffic but when when heavy traffic across Wi-Fi and Ethernet comes ...
by technix
Wed Mar 11, 2015 6:50 pm
Forum: Bare metal, Assembly language
Topic: Altera USB Blaster as JTAG debugger?
Replies: 0
Views: 1242

Altera USB Blaster as JTAG debugger?

I wanted to develop my own Pi operating system but debugging was always a problem. Using Arduino Due as a JTAG debugger is cumbersome but works with a messy desk. Now I want to know if the Altera USB Blaster would work, as I recently come to possess a clone of such device, when I acquired an Altera ...
by technix
Tue Mar 10, 2015 4:07 pm
Forum: Bare metal, Assembly language
Topic: BCM 2836 and the RPi 2 ?
Replies: 95
Views: 28585

Re: BCM 2836 and the RPi 2 ?

I'm relatively new to the PI and I'm a bit hesitant at making this post... If the goal of the PI is education for high level programming, what is the PI solving that a $200 - $300 cheap PC or laptop running Debian Linux does not. Is it really to sell computers to poor children that can't afford a P...

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