simple task to speed up booting

[Poul-Henning Kamp]

The rotating swirlie ('-/|\') in the loader accounts for a surprisingly
large part of our boot time on systems with slow-ish serial consoles.

I think right now it takes a step for each 512 byte read, reducing that
to once every 64kB or even 1MB would be an improvement with the kind of
kernel sizes we have today.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.