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Engagement
  • Author Author: Former Member
  • Date Created: 2 Mar 2012 12:08 AM Date Created
  • Views 1498 views
  • Likes 1 like
  • Comments 14 comments
  • model_a
  • hardware
  • pcb_design
  • pcb_fabrication
  • raspberry_pi
  • model_b
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Overview

Former Member
Former Member
2 Mar 2012

In this blog I hope to share with you some of the more interesting way points on the journey to designing the Raspberry Pi Hardware from the ideas kicking around 6 years ago to the overwhelming (for me and a few servers!) launch on Wednesday. 

 

I was lucky enough to be with element14 in Nuremberg when the RPi arrived from the UK for the noon on-stand launch.  Mike Powell from element14 deftly cabled the RPi, but gave me the 'honour' of powering it up. As many of you will know - it's a heart stopping moment (especially in front of a crowd of enthusiasts) until the kernel boot appears on the screen - it's either command line, terminal silence or smoke!

 

There is plenty of stuff on the Web about the Foundation and it's aims so I won't be repeating it here (unless asked).  There will be little discussion about software - we have lots of talented people in the team that can talk way more sensibly about that.  There is also an equally talented team on the hardware side and I hope I can encourage them to chip in with useful comment and correct me when I go off the rails.

 

I'm very happy to be sign posted to things that interest you - so let me know, and I'm sure they can be worked in somewhere.

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Top Comments

  • Former Member
    Former Member over 14 years ago in reply to Former Member +1
    coder27 - I'm not an expert on driving the Silicon but there is an 128kB L2 cache and by choosing the address range you can either use it or bypass it with the CPU. The GPU is really slated the main user…
  • Former Member
    Former Member over 14 years ago in reply to Former Member

    coder27 -

     

    I'm not an expert on driving the Silicon but there is an 128kB L2 cache and by choosing the address range you can either use it or bypass it with the CPU.  The GPU is really slated the main user.

     

    There is some scant information in: http://www.raspberrypi.org/wp-content/uploads/2012/02/BCM2835-ARM-Peripherals.pdf

     

    At the end of the day a cache just makes things go quicker, although nowadays it is often also used to unpack/pack SDRAM burst reads / writes.  With the L1data and instruction cache and the improved branch predict over the Arm 9, I never really considered it to be an issue.

     

    Within the scope of our project the Silicon was chosen because of it's overall capability - especially in Multimedia and the richness of perhiperals and the low supporting cast of components - it was never intended to be a compute workhorse. We could have chosen something else (but check into Eben's day job).... nuff said.

     

    I would be interested to hear your comments

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  • fustini
    fustini over 14 years ago

    Great to have you on here, and I am really looking forward to your future blog posts!  I enjoyed how you spoke about the challenges invovled with PCB layout and figuring out inexpensive ways to manufacture for micro BGA: http://www.youtube.com/watch?v=5mVEX8U3kl4

     

    Cheers,

    Drew

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  • Former Member
    Former Member over 14 years ago

    I was very interested to read a brief history of the Raspberry Pi development on Russell Davis' blog,

    http://russelldavis.org/2012/01/14/the-raspberry-pi-part-one/

    http://russelldavis.org/2012/01/17/the-raspberry-pi-part-two/

    http://russelldavis.org/2012/01/25/the-raspberry-pi-part-three/

    and would be happy to hear more details!

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  • Former Member
    Former Member over 14 years ago

    Pete,

    Could you explain how a SOC was selected that has no L2 cache for the CPU?  Can you recall any successful Linux computers without an L2 cache?

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