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   RBERRYPI      Support for the Raspberry Pi device      21,939 messages   

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   Message 21,163 of 21,939   
   Daniel to The Natural Philosopher   
   Re: Homebrew pi400   
   15 Dec 24 21:11:45   
   
   INTL 3:770/1 3:770/3   
   REPLYADDR me@sc1f1dan.com   
   REPLYTO 3:770/3.0 UUCP   
   MSGID: <87seqo3b3i.fsf@rpi3> 1e9dc69e   
   REPLY:  01cfc677   
   PID: SoupGate-Win32 v1.05   
   The Natural Philosopher  writes:   
      
   > On 13/12/2024 23:55, Daniel wrote:   
   >> Theo  writes:   
   >>   
   >>> Theo  wrote:   
   >>>> The Natural Philosopher  wrote:   
   >>>>> On 11/12/2024 16:46, Daniel wrote:   
   >>>>>> Andy Burns  writes:   
   >>>>>>   
   >>>>>>> Daniel wrote:   
   >>>>>>>   
   >>>>>>>> Jeff did a teardown on his second channel and soldered a m.2 socket   
   >>>>>>>> hoping it was properly designed. He found the power lines weren't   
   traced   
   >>>>>>>> in so no power.   
   >>>>>>>   
   >>>>>>> There were some nearby component missing too, maybe the Rev1 board has   
   >>>>>>> bugs, and they need a Rev2 (or whatever) but his soldering job looked   
   >>>>>>> relatively clumsy (bridged pins etc).   
   >>>>>>   
   >>>>>> Yeah, it was pretty bad, at least he was honest about it.   
   >>>>>>   
   >>>>>> I am sure things were missing to keep the circuitry disabled and I'm no   
   >>>>>> engineer.   
   >>>>>   
   >>>>> Why would you put support chips on if you were not going to install an   
   >>>>> M.2 socket anyway?   
   >>>>>   
   >>>>> I think he called it right in that this is a bare bones model, and more   
   >>>>> upmarket versions will emerge in due course.   
   >>>>   
   >>>> Looking at:   
   >>>> https://www.jeffgeerling.com/sites/default/files/images/pi-   
   00-m2-socket-install.jpg   
   >>>> https://www.jeffgeerling.com/sites/default/files/images/pi-   
   00-pcb-bottom.jpeg   
   >>>>   
   >>>> I think there's a MOSFET and some decoupling capacitors missing (to the   
   left   
   >>>> of the middle larger hole), so the power isn't connected.  There may be a   
   >>>> pair of missing capacitors in series with the PCIe lane, but I can't   
   >>>> immediately see the footprints for those.   
   >>>   
   >>> Ah, I see them now.  To the right of the spot on the silver chip are four   
   >>> tiny spots for passives, oriented at compass bearing 135 degrees.  I can't   
   >>> tell from the photo or video whether they're populated or not, but those   
   >>> will be the series capacitors.   
   >>>   
   >>> Theo   
   >> I'm going to wait for someone to hack a working solution then copy   
   >> it.   
   > Wait for the Pi 501...with it all one the board already   
      
   I've heard rumor of it but is this confirmed?   
      
   --- SoupGate-Win32 v1.05   
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