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by technix
Thu Jul 04, 2019 5:54 am
Forum: Advanced users
Topic: Does the Pi support booting from GPT drives?
Replies: 6
Views: 707

Re: Does the Pi support booting from GPT drives?

It's not a big problem. The standard EFI / EFI System Partition stuff is way to complicated and cluttered for the Raspberry Pi. Pi's need their FAT32 boot partition to load the Linux kernel and after that everything is fine. Using Hybrid MBR/GPT , the ROM/GPU bootloader can fetch the kernel and con...
by technix
Thu Jul 04, 2019 5:49 am
Forum: Advanced users
Topic: Does the Pi support booting from GPT drives?
Replies: 6
Views: 707

Re: Does the Pi support booting from GPT drives?

...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. The current Pi computers will never boot from a 4GB micro SD card, as those will be SDUC cards and the Pi only supports up to SDXC...
by technix
Thu Jul 04, 2019 5:44 am
Forum: General discussion
Topic: I have some problem with the micro HDMI connector.
Replies: 3
Views: 343

Re: I have some problem with the micro HDMI connector.

This has already been discussed. Video out via USB-C is not possible with that SoC. Stacked full size HDMI is too fragile without support. Micro HDMI is actually pretty common on ultrabooks and tablets. Additional chips would add to the cost. USB-C port is only USB 2.0. Let me debunk those point by...
by technix
Mon Jul 01, 2019 6:49 am
Forum: General discussion
Topic: I have some problem with the micro HDMI connector.
Replies: 3
Views: 343

I have some problem with the micro HDMI connector.

The Pi 4 shipped with two micro HDMI connectors for video out, and a USB Type-C solely for USB 2.0 OTG and power supply. I find this a compatibility hell and a huge missed opportunity. Micro HDMI isn't very common on the market. IMO the better video out implementation would be keep the full-size HDM...
by technix
Mon Jun 24, 2019 3:34 pm
Forum: Beginners
Topic: RPI4 USB C Power Delivery negotiation
Replies: 22
Views: 6164

Re: RPI4 USB C Power Delivery negotiation

I am gonna second this on the question. If Pi 4 can negotiate properly over USB-C, it means for people that have difficulty buying official Raspberry Pi accessories, the power adapter and charging cable for Apple Retina MacBook or iPad Pro can be used as an alternative. p.s. Suggestion: is it possib...
by technix
Mon Jun 03, 2019 5:25 am
Forum: Advanced users
Topic: Does the Pi support booting from GPT drives?
Replies: 6
Views: 707

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: 957

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: 655

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: 655

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: 1700

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: 1157

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: 1700

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: 1157

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: 1700

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: 1700

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: 2564

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: 2564

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: 134008

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: 2001

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: 2768

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: 2001

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: 4284

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: 2001

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: 197124

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: 1063

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 ...

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