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Upgrading kernel used in PXE boot

I'm installing FC6 using kickstart from PXE. It works great, and I've used this (and a similar setup with FC2) for years.

Now, I want to use a new kernel during the installation. FC6 comes with 2.6.18-1.2798.fc6, and I want the boot to use some version of 2.6.20 or greater.

What I've been doing is installing with the default kernel, then upgrading to 2.6.20-1.2962.fc6 after the installation is complete. But now I have a need to run 2.6.20 during installation, because of some hardware that's supported in 2.6.20 but not in 2.6.18.

So my question is: How do I create a new initrd.img and vmlinuz (that came in the isolinux directory) to be a new kernel? It's apparently not as simple as copying these files from a running system.

I've spent hours googling. I've seen all sorts of info on adding drivers to initrd.img, but no info on updating the kernel.

Any info would be great!


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