pxeboot not trying to mount default /pxeroot share

C

cakersq

I am quite familiar with PXE booting, and have a working setup now. What I am trying to do is have a menu based PXE system, from PXELinux/SysLinux, to select different OS's to boot from.

For FreeBSD, I want to have the option of booting from different mount points by choice from the menu, either a Live OS, or an installer, for either amd64 or i386 architecture.

By default pxeboot will try to mount from the DHCP set next-server:/pxeroot. In the past I accomplished this by compiling pxeboot different times, each with a different value of PXENFSROOTPATH (set in /usr/src/sys/boot/i386/libi386/pxe.h ), then with PXELinux, I will choose which file to chain load from and boot.

Code: 
pxelinux.cfg/default

LABEL freebsd-live-32
        PXE /freebsd/pxeboot-live32
        MENU LABEL FreeBSD Live i386
LABEL freebsd-live-64
        PXE /freebsd/pxeboot-live64
        MENU LABEL FreeBSD Live amd64

The problem is pxeboot is trying to mount next-server:/ every time, instead of the value of the internal default PXENFSROOTPATH path. This should be 192.168.1.200:/pxeroot by default.

Code: 
Output from PXE Boot Attempt:

pxe_open: server addr: 192.168.1.200
pxe_open: server path: /
pxe_open: gateway ip: 192.168.1.1
NFS MOUNT RPC error: 13
...

I have gotten this working in the past, but now I can't get it anymore. I have looked in the binaries of my pxeboot, and validated the new values for PXENFSROOTPATH is included.

I have tried this with the pxeboot from 7.4, 8.2 and 9.0-prerelease. No pxeboot binary tries to mount from /pxeroot or from my custom path.

Any ideas?

Code: 
dhcpd.conf:

filename "pxelinux.0";
next-server 192.168.1.200;
# option root-path not used, because that will override the default PXEBOOT values.

Code: 
/etc/exports

/pxeroot -ro -maproot=0 -alldirs

Troubleshooting notes:
- I have tried specifying the default pxeboot file directly from dhcpd.conf, but that has the same problem, so it's not a SysLinux issue.
- I can specify option root-path in dhcpd.conf, and pxeboot will honor that setting each time, regardless of what PXENFSROOTPATH is set to internally.
 
After some debugging, it looks like something is setting rootpath to "/", but I don't know what, it's not done by the DHCP server, I have done packet captures to make sure.

I have a temporary solution to edit /usr/src/sys/boot/i386/libi386/pxe.c to force it to use a an internal path always, instead of checkig to see if a path is externally defined, by:
Code: 
//if (!rootpath[0])
//    strcpy(rootpath, PXENFSROOTPATH);
strcpy(rootpath,"/pxeroot/live-i386");
 
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