You'll want both.  The file system is what goes in the initrd config option

Add a payload (A Linux payload)  --->
(bzImage) Linux path and filename
()  Linux command line
()  Linux initrd

Martin

On Thu, Apr 7, 2016 at 10:31 AM, daoud yessine <yessine.daoud.92@gmail.com> wrote:
Hi 

how  to build coreboot with linux as payload ?
I need Bzimage only ?
what about the file system ?

thanks

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