Re: Linux Framebuffer endian issues

Hi Rolf,

Rolf Offermanns wrote:

Hi Andrey,
I have seen your thread about endian issues with the linux framebuffer system 
and your SMI501 driver.

I am currently writing a driver for a SMI712 on a PCI card in a big endian 
system (PPC440EP).

While 8bpp modes works quite well, I have wrong color in 16bpp truecolor 
visual.

I guess this could be the same thing, you saw.

Did you solve the problem? 

No I defer solution of this problem :(, since 16 bpp doesn't critical
for me in nearest 2 months.

If yes, would you be so kind to share your findings 
with me? I tried lots of things like changing the offsets of the length 
fields, but I was not successfull.

For me, was helpful offsets changing (I get right colors), but in this
case pixels are shifted :(.

Try something like this dirty hack:

--- fb.h.old	2005-10-24 16:46:34.000000000 +0400
+++ fb.h	2005-10-24 16:47:42.000000000 +0400

@@ -778,7 +778,7 @@
 #define fb_writeq sbus_writeq
 #define fb_memset sbus_memset_io

-#elif defined(__i386__) || defined(__alpha__) || defined(__x86_64__) ||

defined(__hppa__) || (defined(__sh__) && !defined(__SH5__)) ||
defined(__powerpc__)
+#elif defined(__i386__) || defined(__alpha__) || defined(__x86_64__) ||
defined(__hppa__) || (defined(__sh__) && !defined(__SH5__))

 #define fb_readb __raw_readb
 #define fb_readw __raw_readw

@@ -790,6 +790,16 @@
 #define fb_writeq __raw_writeq
 #define fb_memset memset_io

+#else if defined(__powerpc__)
+#define fb_readb readb
+#define fb_readw readw
+#define fb_readl readl
+#define fb_readq readq
+#define fb_writeb writeb
+#define fb_writew writew
+#define fb_writel writel
+#define fb_writeq writeq
+#define fb_memset memset_io
 #else

 #define fb_readb(addr) (*(volatile u8 *) (addr))

Thanks,
Rolf

-- 
Regards
Andrey Volkov


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