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Re: Can you MOP boot an install kernel directly?
On 8/4/25 06:57, Anders Magnusson wrote:
Den 2025年08月03日 kl. 23:45, skrev Perry Metzger:
So there seems to be an INSTALL kernel with the usual root-on-ramdisk
available for the Vax. Is there a good reason that one can't directly
MOP boot this?
IIRC MOP on some machines could only load a small amount of data (like
256k or so). Some MOP guru may fillin here?
Also, if the kernel is loaded my MOP then there are some trickery that
needs to be done since it is not located on the expected position in
memory. I wrote code to do that long time ago, it needs
KERNEL_LOADABLE_BY_MOP defined when generating a kernel. Maybe it can
be made to detect whether it is loaded by the boot program or not.
Okay, so, I have a VAXstation 4000 VLC I'm setting up and I'd like to
try to avoid needing a full NFS server, rarpd, and all the rest of that
to boot it for installation (and as I am thinking of cleaning up some of
the install tools I might be installing it repeatedly). One thing that
struck me as a possibility was booting an INSTALL kernel with an
embedded ramdisk directly from MOP, another option struck me as fixing
the network boot blocks so that they can use dhcp and tftp to download
the kernel instead of requiring a full NFS setup. (Many ports allow this
one way or another, either from the blocks themselves or from mechanisms
like PXE.)
Perry
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