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I'm trying to understand what the extlinux bootloader code written into a partition needs to successfully start. I have a disk with four partitions, the second is marked active and contains a kernel, initrd and root FS and extlinux has been run on it. If I use mbr.bin as the initial bootloader the system boots fine. I need this to work within an environment supplied by a third party. They

...fo from /dev/sda to force a network boot? I tried: - wiping the MBR which works but also wipes the partition tables which we don't want. - removing the boot flag from the first partition (not the MBR I know but I thought I'd try it anyway). - based on the info in http://www.ata-atapi.com/hiwmbr.htm I tried wiping the first 138 bytes of /dev/sda Any pointers on where to try next? Thanks CC