When upgrading Debian GNU/Linux from version 3.0 (woody) to version 3.1 (sarge) you will have to upgrade your kernel first on some machines.
This only affects sparc32, hppa64, mips and mipsel machines. In this directory you can find the necessary packages so that you can install kernels from sarge on a woody system. For further information and help on how to use these packages please see the Release Notes for sarge.