(02-03-2022, 04:14 PM)tckosvic Wrote: I thought the above said that the U-Boot was there to temporarily boot from the SD and, hence, removing it would revert back to default booting from the eMMC. Where is U-Boot in the directory structure? Is U-Boot a file that can be removed and where is it?U-Boot is the bootloader and is needed to boot the system. Without it, the system can't boot. It's behaviour can be configured, but I've never tried messing around with it and if you want to, I would make sure first you know what you are doing to not end up with an unbootable system. Here is some more info, not sure if everything there can be applied to the PinePhone Pro.
(02-03-2022, 04:14 PM)tckosvic Wrote: When the pre-installed bootloader was overwritten with a bootloader without such a configuration, the RE button underneath the back cover of the phone can also be used to temporarily bypass the eMMC. I do not have any idea what this sentence is saying. There is no description of where/what the RE button is. I did find it under the back cover. It is a recessed button needing a sharp object (a pen) to push in. There is an RE label. What is the RE button and what is it for (REset)?Yes, that should be the reset button. I'm not sure if it has another function apart from bypassing the eMMC.
(02-03-2022, 04:14 PM)tckosvic Wrote: The button (RE???) may however only be pressed shortly for a few seconds during boot, otherwise the eMMC won't be initialized in the operating system. This is another incoherent sentence. Appears to say that you hold RE button recessed for a short period while pushing boot key to boot to the eMMC. You need cover off to do this. When cover is off these is no boot button. I really have no idea what this is saying.The power button is still there without the cover and can still be pressed. You don't need the plastic cover from the case to press it.
(02-03-2022, 04:14 PM)tckosvic Wrote: Later on in doc it says --Due to the boot order it is strongly recommended to boot from the microSD card only, leaving the eMMC vacant. I don't see the meaning of this sentence and what boot order has to do with why one should boot always from the microSD. A microSD is for extra storage not for running your phone.For now it's recommended to not overwrite the eMMC with another image, because things are not very stable yet and installations may break. If the bootloader on the eMMC gets messed up by that, you won't be able to boot anymore without bypassing the eMMC. That's because the eMMC is always checked first in the boot order and if something to boot is there, but it's broken, you won't get any further. The preinstalled bootloader points to the SD card, so as long as you don't touch it, you will always be able to boot off the SD card and if something on the card breaks, you can easily flash a new image to it. The eMMC is not easily accessible for flashing if you break the bootloader. Of course you can do whatever you want, but be aware that fixing a broken eMMC installation is a lot more hassle than working off the SD card.
