kernel linked for 0xfe100000 will load at the 1MB mark) and read-ahead
buffering to speed booting from floppies. Also works with aha174x
controllers in enhanced mode.
rod, pk patch #159. the comment is:
The +28672 is for memory allocated by locore.s that must fit in the bss!
this seems way wrong to me, but i'm not going to fix it in locore right
now...