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   PID: SoupGate-Win32 v1.05   
   Bryan  wrote:   
   > On 1/5/2024 05:13, The Natural Philosopher wrote:   
   >  > That's what my Pi 4 did on  one version of Bookworm.   
   >  > Try a different version   
   >   
   >   
   >  From what I understand, the Compute Module 4 cannot boot from SD card   
   > because it's literally missing the connections to the card - the card   
   > slot is only there so you can load the Pi OS onto the built-in eMMC.   
   > It's designed to boot from eMMC. If I'd paid attention, I would have   
   > picked up the 8GB eMMC version instead, but after waiting for a year I   
   > took what I could get.   
      
   You have it backwards: the Lite version has no eMMC which is why the   
   official I/O board has an SD card socket to boot the Pi:   
   "MicroSD card socket for Compute Module 4 Lite (without eMMC) variants"   
   https://www.raspberrypi.com/products/compute-module-4-io-board/   
      
   If you have a non-Lite board there's a way to flash the eMMC externally (via   
   USB I think).  If there is onboard eMMC the SD slot is not connected to the   
   Pi (or maybe to the second MMC channel, not sure).   
      
   > If you put a card in, it doesn't do anything. As far as the eeprom, that   
   > shouldn't be an issue past 2021 or so - I can see it trying to boot from   
   > the flash stick, and I did try it without the modem as well.   
      
   I wonder if there is something odd about the way they've wired the SD slot   
   on your board?  Maybe it needs a jumper or something?  What does the   
   documentation for your board say?   
      
   > The version of (official) OS is the only thing I did not try, if I have   
   > time I'll download the second-to-last version and try it this weekend. I   
   > did try the Armbian version, but I don't know that it specifically   
   > states CM4 compatibility.   
      
   There can sometimes be firmware issues that means third party OSes won't   
   boot on new variants of the same board like CM4 because of minor hardware   
   differences, but these are usually ironed out fairly soon after release.   
      
   Theo   
      
   --- SoupGate-Win32 v1.05   
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