Boot sequence for USB mass storage

Nov 13, 2021 0 Replies

Supposing for a moment that I want to use the bootcode.bin-only method of booting a Pi3 can somebody tell me how much of the software in the DOS partiton of the USB device is invoked?



I've always thought that u-boot on the microSD started u-boot on the USB device, but it's never stated in so many words.



It's unclear to me if the steps:



Recurse through each MSD



If bootcode.bin found boot



mean _run_ the newly-found copy of bootcode.bin or merely use it as a flag to denote which device to boot.



I've waded through the voluminous material at

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haven't found an answer that I can recognize. Apologies if I'm dense!



Thanks for reading,



bob prohaska



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