TODO revision 1.4 
1Things to do for the bktr driver, in no special order:
2
3o check for a possibility to replace remaining vtophys()
4o clean up whitespace before and after braces ("( " -> "(")
5o clean up bt8xx.h
6o replace vm_offset_t (still any left?)
7o not tested on anything but i386 -- alpha/macppc probably will have
8  some issues.
9o use NetBSD's own i2c-functions
10o look for cause of warning (without consequence, as far as I can
11  tell): 
12  bktr0: ioctl: tsleep error 35 200001c
13o split up contents of bktr directory to better places? (also fix
14  bktr2netbsd in that case)
15o remove #ifdef'd FreeBSD/OpenBSD code (?)
16o replace unsigned long by u_int32_t (and similar for int/short?)
17