Re: Panic at boot on 4/330 with cgfour and cgsix

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

> #define PFOUR_COLOR_OFF_CMAP 0xfff00000 /* (-0x00100000) */
> 
> Since the cgfour works on sun3 I went and looked at what it does and
> it has an equivalent file sys/arch/sun3/dev/p4reg.h that says the same
> thing. However I noticed the sun3 cgfour driver doesn't use that file
> instead it's using sys/arch/sun3/dev/cg4reg.h which says something
> different.
> 
> /*
>  * Memory layout of the Type B hardware (OBMEM)
>  * P4 appears on the Sun3/60 at 0xFF300000, so
>  * define things relative to that.
>  */
> #define CG4B_OFF_CMAP  (-0x100000)
> 
> So I changed PFOUR_COLOR_OFF_CMAP to (-0x00100000) and I was able to
> boot successfully. I don't know if this is the right way to fix it but
> at least now I can boot the system and test things some more. Thanks
> everyone for the help so far, I'll be trying to run X and other things
> soon and hopefully have some good news.

Somehow bus_addr_t (in sys/arch/sparc/include/bus_defs.h) is uint64_t
so passing "oba->oba_paddr + PFOUR_COLOR_OFF_CMAP"
(i.e. "oba->oba_paddr + 0xfff00000") to bus_space_map(9)
causes unintended (no wraparound) address.

---
Izumi Tsutsui