Re: NetBSD/sparc running on qemu

[Michael <macallan%NetBSD.org@localhost>]

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Hello,

On Jan 15, 2010, at 9:24 PM, Izumi Tsutsui wrote:

> > > BTW, IIRC -current has some problem on qemu around TCX wscons  
> > > driver.
> >
> > Like what exactly?
>
> The first problem is genfb(4) matches first and
> it doesn't print any characters.

That should be trivial to fix.

> Once I fixed tcxmatch() to return >1 value, the kernel panics
> by invalid pointer access in tcxattach(), IIRC.
> Registers are not mapped properly in 8bit only TCX case?

The only registers we map belong to the DAC. My best guess is this -  
the S24 has two blit spaces and two stipple spaces ( basically, you do  
a 64bit write to copy up to 32 pixels or to draw up to 32 pixels ) -  
one that influences the S24's control planes and one that doesn't.  
Since the tcx doesn't have any control bits ( on S24 they're poor  
man's WIDs - you can have 8bit, 24bit with or without two different  
gamma correction algorithms ) so the driver probably tries to map a  
blit- or stipple space that doesn't exist on tcx.

Look for this in tcx.c:
        /* RBLIT space */
        if (sbus_bus_map(sa->sa_bustag,
                 sc->sc_physaddr[TCX_REG_RBLIT].oa_space,
                 sc->sc_physaddr[TCX_REG_RBLIT].oa_base,
                         8 * 1024 * 1024,
                         BUS_SPACE_MAP_LINEAR | BUS_SPACE_MAP_LARGE,
                         &bh) != 0) {
                printf("tcxattach: cannot map RBLIT space\n");
                return;

and s/RBLIT/BLIT, then do the same for RSTIP->STIP

I used the RSTIP space in order to force the pixels drawn to 8 bit and  
RBLIT to nicely scroll out any artifacts that X or whatever may leave  
in the control planes. If tcx doesn't have them we shouldn't use them  
- - what little documentation I had was unclear on the subject but  
seemed to indicate that tcx has both space and it doesn't make a  
difference which one we use.

have fun
Michael

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