Broken Boot
05-04-2021, 06:27 PM
Don't do anything with the SPI flash ROM at this point. You don't need it just yet. But you won't be able to directly boot to the NVME drive without it.
And don't worry about the eMMC until you can boot from micro SD. If you can't boot from micro SD, you can't boot from anything. It isn't unheard-of to have one or more micro SD cards just quit working with the PBP. I would try another card. Flash a bootable image to it, and you should get the power LED to turn on. This is done by software (U-boot). A dark power LED is a pretty good sign that U-boot is failing. U-boot exists in an unformatted partition at the start of your micro SD. This is why correct flashing is pertinent; and why sometimes just inserting such a card into another computer can corrupt your U-boot (operating systems don't know what to do with that unformatted partition and some might do any manner of things to it at any time).
And don't worry about the eMMC until you can boot from micro SD. If you can't boot from micro SD, you can't boot from anything. It isn't unheard-of to have one or more micro SD cards just quit working with the PBP. I would try another card. Flash a bootable image to it, and you should get the power LED to turn on. This is done by software (U-boot). A dark power LED is a pretty good sign that U-boot is failing. U-boot exists in an unformatted partition at the start of your micro SD. This is why correct flashing is pertinent; and why sometimes just inserting such a card into another computer can corrupt your U-boot (operating systems don't know what to do with that unformatted partition and some might do any manner of things to it at any time).