Kostas Gewrgiou wrote:

On Thu, 25 Jan 2001, Geert Uytterhoeven wrote:

quoted

On Thu, 25 Jan 2001, Kostas Gewrgiou wrote:

quoted

quoted

Changing the endian to little is the *right* thing, big-endian mode
doesn't offer us anything beyond problems in matroxfb 8/16 bit accesses
become a nightmare there...

8/16 bit accesses? I assume you're talking about the frame buffer, not
about the register accesses?

No i am talking about register accesses, for example
the mga driver in xfree86 uses
 #define MGAISBUSY() (INREG8(MGAREG_Status + 2) & 0x01)
SDL uses
 #define mga_wait(space)  {                                             \
        while ( mga_in8(MGAREG_FIFOSTATUS) < space );                   \
 }

Both will fail under big-endian mode in PPC, the addressing is changed
so you have to use something like *(addr + (3-addr%4) to get the right
byte (i hope i got it right, its still early here)

What about adapting the macros then?


Michel


--
Earthling Michel Dänzer (MrCooper)    \   Debian GNU/Linux (powerpc) developer
CS student, Free Software enthusiast   \        XFree86 and DRI project member

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