vga16fb is an available config option on powerpc, but it won't link
with my .config:
ERROR: "vgacon_remap_base" [drivers/video/vga16fb.ko] undefined!
I'm guessing this is because include/asm-powerpc/vga.h declares
vgacon_remap_base:
extern unsigned long vgacon_remap_base;
...but arch/powerpc/kernel/setup_32.c wraps the definition in an #ifdef:
#ifdef CONFIG_VGA_CONSOLE
unsigned long vgacon_remap_base;
EXPORT_SYMBOL(vgacon_remap_base);
#endif
So CONFIG_VGA_CONSOLE=n and CONFIG_FB_VGA16=[y|m] won't work.
I've also noticed that the only places in the tree that ever assign
anything to config_remap_base are under arch/ppc. And
include/asm-powerpc/vga.h also does this:
#ifdef __powerpc64__
#define VGA_MAP_MEM(x,s) ((unsigned long) ioremap((x), s))
#else
#define VGA_MAP_MEM(x,s) (x + vgacon_remap_base)
#endif
So VGACON probably doesn't work either on 32bit. I'm guessing arch/powerpc
doesn't support PREP.
How best could this be fixed up? Or should I just let the thing
be? This is obviously not a new thing, and I don't have any hardware
that supports this stuff either.
--
Joseph Fannin
jfannin@gmail.com
On Tue, 2007-10-16 at 15:14 -0400, Joseph Fannin wrote:
vga16fb is an available config option on powerpc, but it won't link
with my .config:
ERROR: "vgacon_remap_base" [drivers/video/vga16fb.ko] undefined!
I'm guessing this is because include/asm-powerpc/vga.h declares
vgacon_remap_base:
extern unsigned long vgacon_remap_base;
...but arch/powerpc/kernel/setup_32.c wraps the definition in an #ifdef:
#ifdef CONFIG_VGA_CONSOLE
Perhaps #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_FB_VGA16) ?
or
bool VGA_HARDWARE
#if CONFIG_VGA_HARDWARE
unsigned long vgacon_remap_base;
EXPORT_SYMBOL(vgacon_remap_base);
#endif
and for the Kconfig entry of vgacon and vga16fb
select VGA_HARDWARE if PPC32
(or depends on (VGA_HARDWARE && PPC32))
Tony
On Tue, 16 Oct 2007, Joseph Fannin wrote:
vga16fb is an available config option on powerpc, but it won't link
with my .config:
ERROR: "vgacon_remap_base" [drivers/video/vga16fb.ko] undefined!
I'm guessing this is because include/asm-powerpc/vga.h declares
vgacon_remap_base:
extern unsigned long vgacon_remap_base;
...but arch/powerpc/kernel/setup_32.c wraps the definition in an #ifdef:
#ifdef CONFIG_VGA_CONSOLE
unsigned long vgacon_remap_base;
EXPORT_SYMBOL(vgacon_remap_base);
#endif
So CONFIG_VGA_CONSOLE=n and CONFIG_FB_VGA16=[y|m] won't work.
I've also noticed that the only places in the tree that ever assign
anything to config_remap_base are under arch/ppc. And
include/asm-powerpc/vga.h also does this:
#ifdef __powerpc64__
#define VGA_MAP_MEM(x,s) ((unsigned long) ioremap((x), s))
#else
#define VGA_MAP_MEM(x,s) (x + vgacon_remap_base)
#endif
So VGACON probably doesn't work either on 32bit. I'm guessing arch/powerpc
doesn't support PREP.
It's not only useful for PREP, but also for CHRP.
How best could this be fixed up? Or should I just let the thing
be? This is obviously not a new thing, and I don't have any hardware
that supports this stuff either.
I remember this problem was present when I still had a working LongTrail (which
is CHRP), long before arch/powerpc/ was created.
With kind regards,
Geert Uytterhoeven
Software Architect
Sony Network and Software Technology Center Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium
Phone: +32 (0)2 700 8453
Fax: +32 (0)2 700 8622
E-mail: Geert.Uytterhoeven@sonycom.com
Internet: http://www.sony-europe.com/
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On Wed, 2007-10-17 at 10:49 +0200, Geert Uytterhoeven wrote:
quoted
So VGACON probably doesn't work either on 32bit. I'm guessing
arch/powerpc
quoted
doesn't support PREP.
It's not only useful for PREP, but also for CHRP.
quoted
How best could this be fixed up? Or should I just let the thing
be? This is obviously not a new thing, and I don't have any
hardware
quoted
that supports this stuff either.
I remember this problem was present when I still had a working
LongTrail (which
is CHRP), long before arch/powerpc/ was created.
It's all very old stuff that needs to be dusted. If you have a setup
where legacy VGA is useable, feel free to do a bit of work on that :-)
Ben.