03-05-2025, 12:04 PM
@zkajdan no worries!
concerning uboot, i don't believe there's an easy way to use uboot to tell the pbp which drive to boot from. in fact, if you're seeing that, it would indicate to me that the pbp has already selected and booted a drive (likely the emmc.) the "easiest" way to ensure your PBP boots from the TowBoot installation SD would be to disable the emmc using the internal switch. that will prevent anything already installed from interfering with booting from the SD card. After booting from the SD card and installing TowBoot, you should be able to power down, insert your OS install SD, and when you boot back up you should see the TowBoot logo in the corner with a key interruption option to select your boot media manually.
concerning the possibility of swapping out the part from your older PBP, i do believe that would be possible. though the PBP has undergone some revising between batches, i do not believe any of them were major enough to warrant changing the primary body pieces of the laptop itself. if you wanted to double check, whenever you remove the bottom cover to fli[ the eemc switch, you could put the 2 next to each other, with both bottom plates removed, and compare all the mounting locations. everything should matchup.
concerning uboot, i don't believe there's an easy way to use uboot to tell the pbp which drive to boot from. in fact, if you're seeing that, it would indicate to me that the pbp has already selected and booted a drive (likely the emmc.) the "easiest" way to ensure your PBP boots from the TowBoot installation SD would be to disable the emmc using the internal switch. that will prevent anything already installed from interfering with booting from the SD card. After booting from the SD card and installing TowBoot, you should be able to power down, insert your OS install SD, and when you boot back up you should see the TowBoot logo in the corner with a key interruption option to select your boot media manually.
concerning the possibility of swapping out the part from your older PBP, i do believe that would be possible. though the PBP has undergone some revising between batches, i do not believe any of them were major enough to warrant changing the primary body pieces of the laptop itself. if you wanted to double check, whenever you remove the bottom cover to fli[ the eemc switch, you could put the 2 next to each other, with both bottom plates removed, and compare all the mounting locations. everything should matchup.