15

All I've ever heard about Raspberry Pi is that its an "open source" SoC. But I see that the CPU inside the BroadCom SoC is an ARM chip.

My understanding of open source hardware is that every single hardware component on it has to be open source in order for the unit as a whole to be OSH. But if ARM is proprietary, then how can RPi be OSH?!?

  • 3
    As Recantha points out, it isn't open source hardware. It uses predominantly open source software because that's the easiest way to get anything done for something like this. – goldilocks Jan 21 '15 at 18:59
  • 2
    Eben Upton has pointed out that the engineering focus on the RPi is on cost, not on being openness. – cspirou Feb 4 '15 at 9:28
15

Raspberry Pi has never maintained that the Pi is open source. There are many parts of it, especially the software, which are open source, but not everything is. There has been criticism of the Pi for having parts which are closed source, however given that the aim of the Pi is education of children, open sourcing everything is not seen as a priority.

  • 1
    Especially the early bootloader is not open source software. Do note that the 0-th stage bootloader is actually GPU firmware ... the system grew that way – flakeshake May 30 '16 at 8:22
4

Not sure where you got the impression that the Pi (or anything else for that matter) is 'open source HARDWARE' ..

For sure it's not .. it does however run Open Source Software on a SOC that includes a GPU with micro-code which is a closed source 'blob' (it has to be for two very good reasons - (1) you can perform H264, MPEG and VC1 video decode on the GPU (and that means a Licence Fee is REQUIRED to stay legal) and (2) the GPU silicon is an ancient design with a number of 'undocumented features' (so anyone changing the micro-code for one function risks 'breaking' it's operation in other, apparently unrelated, functions)

Whilst I would agree that not having access to the GPU microcode is a bit of a drawback, especially for anyone wanting to achieve any sort of real performance out of the Pi, it was never really aimed at anything other than School kids (apparently the 'hobbiest' came as a bit of an afterthought ..)

On the other hand, where else can you get so much 'free' software (and so much 'free' support) on a system for less than $30 ?

  • "or anything else for that matter" -> There is open source hardware; the example closest to the pi would be the BeagleBoard. It's pretty rare though, especially in the PC/laptop realm. Note the FOSS software you refer to actually runs on anything, has been evolving for decades, and was not designed especially for the pi -- it was just sort of re-branded. I believe the Rpi Foundation doesn't care one way or another about open design except in so far as it is convenient for them. – goldilocks Mar 12 '15 at 10:44
  • 1
    "Open Source Software on a SOC that includes a GPU with micro-code which is a closed source 'blob'" Which basically makes it even on software-level closed source. There needs to be only a single software component in a system to be closed source in order to make the whole system closed source. Also the additional for some valuable for others unnecessary software that is preinstalled on the larger Raspbian image (since Jessie we have Lite and non-lite version) has some pretty solid closed source applications. – rbaleksandar May 9 '16 at 10:14
  • I believe the fact that the SoC bootloader is closed source doesn't change much, as the memory is One-Time-Programmable anyway. – jiggunjer Jan 25 '17 at 4:52
0

There are many different open source licenses out there. With each license, the definition of open source can be quite different with regard what needs to be shared and what needs to be allowed or denied from a reuse and redistribution standpoint.

Most of the hardware value provided by the Raspberry Pi is contained inside the Broadcom BCM2837 SoC (Raspberry Pi 3 and later, also used in some Raspberry Pi 2 revisions). This IC is not open sourced and for reasons that I am unfamiliar does not appear to have general market availability or documentation publicly available for it.

No major distributor lists this IC for sale, nor does Broadcom make the datasheet available for download on their website.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.