>> Similar issues happen with things like mirroring & multihead. Some chips
>> can do mirroring only (I have code for mach64 to do that), so in this
>> case, a single ioctl is enough to enable/disable it.
>
>You have code for mirroring on mach64? Do share :-)
Works with LT-G (wallstreet), not tested on anything else especially not on
rage Pro (which is usally real dual head, unless the LT-G),
Written by Dan Malek.
/* Experiment with PowerBook video output mode.
* Dan Malek ([EMAIL PROTECTED])
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <stdio.h>
#define eieio() asm volatile ("eieio" : : : "memory")
main(int argc, char **argv)
{
int mem_fd, i;
uint immap_mem, *mem_word, orig;
if ((mem_fd = open("/dev/mem", O_RDWR)) < 0) {
perror("mem open");
exit(2);
}
/* Map control registers of 3D LT on PowerBook Wallstreet.
*/
immap_mem = (uint)mmap(NULL, 128 * 1024, (PROT_READ | PROT_WRITE),
MAP_SHARED, mem_fd, 0x827ff000);
close(mem_fd);
if ((int)immap_mem < 0) {
perror("mmap");
exit(1);
}
/* Pointer to LCD_GEN_CNTL.
*/
mem_word = (uint *)(immap_mem + 0xcd4);
orig = *mem_word;
printf("%08x\n", orig);
/* Enable LCD (was by default) and CRT.
*/
*mem_word = (orig | 0x01000000);
sleep(10);
/* Enable CRT, disable LCD.
*/
*mem_word = ((orig & ~0x02000000) | 0x01000000);
sleep(10);
/* Enable LCD only.
*/
*mem_word = orig;
exit(0);
}
