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  • Author Author: Former Member
  • Date Created: 2 Mar 2012 12:08 AM Date Created
  • Views 1502 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…
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  • Former Member
    Former Member over 14 years ago

    http://zenit.senecac.on.ca/wiki/index.php/Raspberry_Pi_Fedora_Remix_Installation claims that you must use a SD card, specifically: "Do not use a MicroSD card with an adapter -- it will not be recognized by the Raspberry Pi."

     

    As a HW engineer, can you comment on the basis for this statement? I thought a microSD card in an adaptor *is* an SD card, and the computer should not be able to see any difference (?)  I understand that there may be trouble with some Class 10 cards, and 16 GB size SDHC, but I don't understand why all microSD is forbidden.

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  • Former Member
    Former Member over 14 years ago

    http://zenit.senecac.on.ca/wiki/index.php/Raspberry_Pi_Fedora_Remix_Installation claims that you must use a SD card, specifically: "Do not use a MicroSD card with an adapter -- it will not be recognized by the Raspberry Pi."

     

    As a HW engineer, can you comment on the basis for this statement? I thought a microSD card in an adaptor *is* an SD card, and the computer should not be able to see any difference (?)  I understand that there may be trouble with some Class 10 cards, and 16 GB size SDHC, but I don't understand why all microSD is forbidden.

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  • Former Member
    Former Member over 14 years ago in reply to Former Member

    I agree - there is no obvious reason why this should be a problem as the adaptor is a completely passive device.  I think this stems from the fact that microSD cards are largely based on later generations of silicon (die shrink to meet the form factor). This comment is in some way related to the troubles with some Class 10 cards and the microSD therefore appeared to be a total no go.

     

    We are in the process of running some tests on microSD cards to find which ones (if any) work and we are also looking at issues with Class 10 and SDHC to see if we can find a fix.  We will publish more when we have some solid results to share.

     

    From a hardware point of view I would have loved to use a just microSD card - just look at all the real estate I could have saved!

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