I have successfully PXE booted Knoppix 7.0.5 using pxelinux with the following relevant settings:
Code:
kernel knoppix/linux
append nfsdir=192.168.1.200:/knoppix nodhcp lang=en apm=power-off ramdisk_size=100000 init=/etc/init nomce libata.force=noncq hpsa.hpsa_allow_any=1 loglevel=1 tz=localtime BOOT_IMAGE=KNOPPIX
initrd knoppix/miniroot.gz
After upgrading the copy of Knoppix on my NFS server to 7.2 and upgrading the files "linux" and miniroot.gz (now called minirt.gz) to the new versions, PXE boot now errors out. My pxelinux config is the same except that I have upgraded the last line to reflect the new file minirt.gz.

I get the following error message:
Code:
/init: cd: line 1: can't cd to /modules/net
Loading network device module(s)
/init: cd: line 1: can't cd to /modules/net
sh: can't access tty; job control turned off
/ #