[Buildroot] Boot from CRAMFS partition on an emmc

[Marko Stanisic]

Hello everyone,

Have someone worked extensively with cramfs rootfs?

I created an emmc.img file in buildroot 2020.11.1.

(several partitions with two same rootfs.cramfs partitions, but loading 
from one of them at a time)


I have created two rootfs partitions in that image file , which are both 
defined as

a CRAM Filesystem. (have zImage and device tree inside a rootfs.cramfs 
in the folder /boot)


My f*irst problem* is that i have no clue how to handle these two 
partition from U-boot (2016)

I have following commands:

    - cramfsls (should show directory from an image??) and

    - cramfsload   (have to set environment variable cramfsaddr, from 
where the cramfs is loaded plus offset )


*Second problem* is that with *mmc part*  the rootfs.cramfs partitions 
are not visible, but both defined as bootable.

But i know startadress and number of sectors from every partition

(got from fdisk -l on my host pc inspecting the emmc.img)


Maybe i have some missunderstanding how to handle that, but have someone 
an idea here?

Thanks for every help i get!!


PS: I dont want ramdisks as these are regularly used with cramfs



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