means that kernels from now on are not bootable by !BtRiscBSD but only with
!BtNetBSD.
Big initial commit for a new cleaned up and extended bootblock style. This
patch also allows ELF symbol tables to be read when the patches on the
bootloader are commit but will work fine with the older bootloader.
An extra option `oldkernel' will be provided in the newer bootloader to
pass out old style bootconfig's thus enabling old style kernels to load and
function.
Tested on a.out and ELF (preliminary) kernels with both older and new style
bootconfig blocks.
11982f07b9