Ronald G. Minnich | 02fa3b2 | 2004-10-06 17:33:54 +0000 | [diff] [blame] | 1 | #include <stdio.h> |
| 2 | #include <fcntl.h> |
| 3 | |
| 4 | #include <unistd.h> |
| 5 | #include <sys/mman.h> |
| 6 | |
| 7 | main(int argc, char *argv[]) |
| 8 | { |
| 9 | int i; |
| 10 | volatile unsigned char *cp; |
| 11 | int fd; |
| 12 | void *v; |
| 13 | off_t nvram; |
| 14 | size_t length = 0x1000; |
| 15 | |
| 16 | fd = open("/proc/bus/pci/00/0a.1",O_RDONLY); |
| 17 | lseek(fd,0x10,0); |
| 18 | read(fd,&nvram,sizeof(nvram)); |
| 19 | close(fd); |
| 20 | //printf("Star %x\n",nvram); |
| 21 | |
| 22 | if((fd = open("/dev/mem",O_RDWR)) != -1) |
| 23 | { |
| 24 | v = mmap(0, length, PROT_READ | PROT_WRITE, MAP_SHARED,fd,nvram); |
| 25 | fprintf(stderr, "mmap returns %p\n", v); |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame] | 26 | |
Ronald G. Minnich | 02fa3b2 | 2004-10-06 17:33:54 +0000 | [diff] [blame] | 27 | if ( v == (void *) -1) |
| 28 | { |
| 29 | perror("mmap"); |
| 30 | exit(1); |
| 31 | } |
| 32 | } else { |
| 33 | perror("open /dev/mem"); |
| 34 | exit(1); |
| 35 | } |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame] | 36 | |
Ronald G. Minnich | 02fa3b2 | 2004-10-06 17:33:54 +0000 | [diff] [blame] | 37 | for( i = 0x836 ; i < 0x840 ; i++){ |
| 38 | *(unsigned char *)(v+i) = 0; |
| 39 | } |
Stefan Reinauer | 14e2277 | 2010-04-27 06:56:47 +0000 | [diff] [blame] | 40 | |
| 41 | |
Ronald G. Minnich | 02fa3b2 | 2004-10-06 17:33:54 +0000 | [diff] [blame] | 42 | } |