[Buildroot] Boot from CRAMFS partition on an emmc
sankerspace at gmail.com
Thu Apr 29 15:50:39 UTC 2021
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
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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