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