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#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
main(int argc, char *argv[])
{
int i;
volatile unsigned char *cp;
int fd;
void *v;
off_t nvram;
size_t length = 0x1000;
fd = open("/proc/bus/pci/00/0a.1",O_RDONLY);
lseek(fd,0x10,0);
read(fd,&nvram,sizeof(nvram));
close(fd);
//printf("Star %x\n",nvram);
if((fd = open("/dev/mem",O_RDWR)) != -1)
{
v = mmap(0, length, PROT_READ | PROT_WRITE, MAP_SHARED,fd,nvram);
fprintf(stderr, "mmap returns %p\n", v);
if ( v == (void *) -1)
{
perror("mmap");
exit(1);
}
} else {
perror("open /dev/mem");
exit(1);
}
for( i = 0x836 ; i < 0x840 ; i++){
*(unsigned char *)(v+i) = 0;
}
}
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