PXE boot using Grub bootloader fails at mountroot; no PXE devs.

[Beeblebrox]

I'm using grub2 as the pxe bootloader rather than BTX's pxeboot.

I get Grub to load kernel and all necessary modules and boot. It goes as far
as mountroot> and stops. "?" fails to show any pxe devices. If I  recall
correctly, when booting from BTX and upon hitting a mountroot problem, "?"
is able to show pxe device. The kernel modules {nfscl.ko, nfsclient.ko,
nfscommon.ko} are loaded through grub.cfg kfreebsd_module entries. Using the
BTX pxeboot system boots and mounts everything normally.

At this point, I could only think of two possibilities: A) the grub.cfg
entry is wrong (which I don't think so since as stated above mountroot> "?"
shows no available pxe devices). Or B) the more plausible reason is that I
need to load some other module which will make the pxe devices become
visible to the mountroot process. Grub's normal solution to this problem
(pxechainloader $path/pxeboot) has been broken for some time unfortunately.

I'd like to make sure that I am loading all the necessary modules through
grub.cfg (for diskless clients) before heading over to the grub mail list
with this problem. Server-side loaded modules: {nfsd.ko, nfslockd.ko,
nfsserver.ko, nfs_common.ko, acl_nfs4.ko} within kernel: {nfscommon, nfssvc,
nfs, nfscl, nfslock}.

As a side comment, under BTX as long as one has "option root-path" in
dhcpd.conf and a correct fsatb entry for "/", none of the below are needed
in loader.conf - system is able to boot without these and mount ro (from
fstab):
boot.nfsroot.server="192.168.2.1"
boot.nfsroot.path="/data/amd6"
vfs.root.mountfrom="nfs:192.168.2.1:/data/amd64"
vfs.root.mountfrom="nfs"

Regards.



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FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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