The firmware on OCTEON machines usually does not provide an interface
for accessing devices, which has made it tricky to implement an OpenBSD
bootloader. To solve this device access problem, this new loader has
been built on top of a small kernel. The kernel provides all the
necessary devices drivers, while most of the usual bootloader logic
is in a userspace program in a ramdisk.
The loader program is accompanied by a special device, octboot(4).
The main purpose of this device is to implement a mechanism for
loading and launching kernels. The mechanism has been inspired by Linux'
kexec(2) system call.
The bootloader will be enabled later when it is ready for general use.
Discussed with deraadt@

While here, also remove two forgotten descriptions for long obsolete
devices.

ok deraadt@ yasuoka@ reyk@

ok kettenis@ deraadt@ jasper@

unused for now, but I plan to convert all programs in base to use it in
a future diff. /dev/bpf0 is for compatibility with existing binaries
and is to be removed after a transition period.
ok rpe krw, for the installer part
"Let's see it hit the tree." deraadt

OK dlg@ mpi@

ok dlg@

discussed with rpe and halex

number of audio* nodes from 3 to 1 on vax, since none of the audio-capable
vax can receive another audio device as expansion (until we get TURBOchannel
support with DMA on VS4k/90).
ok deraadt@ todd@

discussed with jsing and millert

explicitly. OK dlg@ & todd@

Prodded by jmc@.

General huzzahs.
"go for it" deraadt@

ok todd@ krw@ deraadt@

get it in! jsing@

ok jasper@ (also compile tested)

ok miod@, deraadt@, todd@.

ok miod@

all-in-one usb card readers and memory sticks you run out of sd
device files very quickly with default install.
This doesn't affect install media.
ok krw@ miod@

ok miod@ jasper@

"Special purpose devices" section, since a hardware driver which uses
video(4) also could be none-USB as long it uses the V4L2 API.
OK todd@

get it in, deraadt@

ok deraadt@, marco@

prompted by/ok dlg@ deraadt@

grudgingly ok deraadt@

pave the way for future work; ok since this does not change the generated
MAKEDEV

ok miod@

manpage will not look ugly.