Multiple kernels and boot partitions selection

[gianluca]

Hello,
I was wondering if there is/are some standard way(s) to achieve a 
multiple boot selection on u-boot startup.

Let's say I have a bunch of partitions:

1- /dev/mmcblk0p7 with Debian 11 Bullseye

2- /dev/mmcblk0p5 with Debian 10 Buster

All of these partitions have the /boot/uImage kernel images, the 
/lib/modules/$(uname -r) drivers folders and /boot/dtb device-trees into 
their partition section.

u-boot has NOT the specific environment partition, i.e. it is located in 
the end of bootloader itself up to the maximum size of the bootloader 
partition. So, to be clear the /dev/mmcblk0p1 contains u-boot code & 
envar space.

If needed I can have a MB85RC64 a 24LC64 FRAM/EEPROM compatible memory 
chip to store information on boot.

Regards,
Gianluca
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