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I see this example in the dracut docs:

linux (loop)/isolinux/vmlinuz0 
    boot=isolinux
    iso-scan/filename=$isofile
    root=live:LABEL=$isolabel
    ro
    rd.live.image 

These texts:

don't explain these parameters in detail.

casper hook is from another system http://manpages.ubuntu.com/manpages/hardy/man7/casper.7.html (not related, and doesn't contain isoboot parameter description)

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This ought to be a question for dracut. It's only peripherally related to grub2 in that you have to pass the right kernel commands to boot proper. Here is a link to the index of shell scripts from the dracut project site containing the ones that set up iso-scan, hopefully this helps - it certainly helps me understand what's going on! https://code.openhub.net/project?pid=5vezaKwZGfs&did=modules.d%2F90dmsquash-live&cid=d8dJ4k7PylM

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