Re: X on Lemote Yeeloong

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

Hello,

On Sat, 9 Jul 2016 17:44:13 -0300 (ADT)
Jared McNeill <jmcneill%invisible.ca@localhost> wrote:

> On Sun, 24 Jan 2016, John D. Baker wrote:
> 
> > It still dies with "Memory fault."  Again, no core file unless started
> > as "root".  Again, 'gdb' claims the resulting "Xorg.core" is not a core
> > dump: File format not recognized.
> 
> I hit this issue today. Here's a fix that works for me. Not sure if I 
> should commit it to xorg-server.old, xorg-server, or both.
> 
> 
> Index: external/mit/xorg-server.old/dist/hw/xfree86/vgahw/vgaHW.h
> ===================================================================
> RCS file: /cvsroot/xsrc/external/mit/xorg-server.old/dist/hw/xfree86/vgahw/vgaHW.h,v
> retrieving revision 1.1.1.1
> diff -u -p -r1.1.1.1 vgaHW.h
> --- external/mit/xorg-server.old/dist/hw/xfree86/vgahw/vgaHW.h	9 Jun 2016 09:07:59 -0000	1.1.1.1
> +++ external/mit/xorg-server.old/dist/hw/xfree86/vgahw/vgaHW.h	9 Jul 2016 20:40:45 -0000
> @@ -174,7 +174,7 @@ typedef struct _vgaHWRec {
>   #define BITS_PER_GUN 6
>   #define COLORMAP_SIZE 256
> 
> -#if defined(__powerpc__) || defined(__arm__) || defined(__s390__) || defined(__nds32__)
> +#if defined(__powerpc__) || defined(__arm__) || defined(__mips__) || defined(__s390__) || defined(__nds32__)
>   #define DACDelay(hw) /* No legacy VGA support */
>   #else
>   #define DACDelay(hw)							      \
> Index: external/mit/xf86-video-siliconmotion/dist/src/smi_driver.c
> ===================================================================
> RCS file: /cvsroot/xsrc/external/mit/xf86-video-siliconmotion/dist/src/smi_driver.c,v
> retrieving revision 1.4
> diff -u -p -r1.4 smi_driver.c
> --- external/mit/xf86-video-siliconmotion/dist/src/smi_driver.c	20 Jul 2015 00:10:28 -0000	1.4
> +++ external/mit/xf86-video-siliconmotion/dist/src/smi_driver.c	9 Jul 2016 20:40:46 -0000
> @@ -2010,6 +2010,7 @@ SMI_EnableVideo(ScrnInfoPtr pScrn)
>   void
>   SMI_EnableMmio(ScrnInfoPtr pScrn)
>   {
> +#if !defined(__mips__)
>       SMIPtr pSmi = SMIPTR(pScrn);
> 
>       ENTER();
> @@ -2038,11 +2039,13 @@ SMI_EnableMmio(ScrnInfoPtr pScrn)
>       }
> 
>       LEAVE();
> +#endif
>   }


Hmm, is SMI_EnableMmio() actually causing the crash? If it does, do
writes to any of the VGA registers work? I wouldn't be the slightest
bit surprised if PCI IO accesses don't work right or if the VGA
registers need to be enabled somewhere which the Lemote firmware
doesn't do.
My gdium won't be helpful here, it has an SM502 which doesn't have any
VGA compatibility parts to begin with.

have fun
Michael