sync/async [was: Re: tt_ioctl]

[Poul-Henning Kamp]

In message <FD6E3ED5-5315-4F39-9EF0-8C0FC1683802 at mac.com>, Marcel Moolenaar wri
tes:

>I think the complexity or problems stem from the fact that
>there's a single driver. With scc(4) the design is such that
>the driving is left to subordinate drivers like uart(4) and
>the only thing that scc(4) does is arbitration.

Yeah, we have the same thing over at the ppbus.

I remember talking with Warner about making this a facility in
newbus instead, but I think we had too much beer and too little
time :-)

-- 
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.