[yocto] How to run script before mount rootfs

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Hi,

You can have a look at https://wiki.yoctoproject.org/wiki/System_Update. 

I have used RAUC and u-boot on Rasperry Pi, there is an meta-rauc layer for Yocto. RAUC Dok at https://rauc.readthedocs.io/en/latest/. RAUC have an u-boot example script for loading different rootfs on boot, have a look at there GitHub:
https://github.com/rauc/rauc/blob/master/contrib/uboot.sh

Best regards
Jonas Andersson

> 3 juli 2019 kl. 18:59 skrev Szabolcs Báder <sb at baader.hu>:
> 
> Hi,
> 
> I created for Raspberry Pi a simple OS-boot-switcher. I change a param from rootfs, reboot and new OS run. I would like to add to for this flow a parameter to create ro boot and rootfs. 
> 
> I would like to read this parameter at boot and depend on this choose which OS will load. How could I define this at boot (eg. from cmdline.txt or with a shell script or load c code ..?). What is the best idea/ way to do that within Yocto?
> 
> 
> Thanks in advance,
> Szabolcs
> -- 
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