Re: port-cobalt/44292: -current kernels do not work on (my) cobalt qube 2 since one (1!) year

[Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>]

The following reply was made to PR port-cobalt/44292; it has been noted by 
GNATS.

From: Izumi Tsutsui <tsutsui%ceres.dti.ne.jp@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: tsutsui%ceres.dti.ne.jp@localhost
Subject: Re: port-cobalt/44292: -current kernels do not work on (my) cobalt
         qube 2 since one (1!) year
Date: Thu, 20 Jan 2011 01:27:05 +0900

 >  >  > -                                      SET(sc->sc_mcr, MCR_PRESCALE);
 >  >  > -                                      sc->sc_frequency /= 4;
 >  
 >  Presumably MCR_PRESCALE is generating a divide by 4.
 >  So doing this more than once generates an invalid sc_frequency ??
 
 It's in com_attach_subr() so only once per attach,
 but it causes a problem if com(4) is already initialized
 in cnattach(), which doesn't care prescaler.
 
 >  So should this just be dependant on whether MCR_PRESCALE is already set?
 
 Presclaer is quite device dependent, so MCR_PRESSCALE should be set
 and sc_frequency should be adjusted in MD sys/arch/amiga/dev/com_supio.c
 attachment, I think.
 
 >  I guess SET(a,b) is '(a) |= (b)' just to confuse things.
 
 It's a separate discussion. (unless you will do cleanup the whole sources)
 ---
 Izumi Tsutsui