crashtest-r0ket/tools/bootloader/lpcfix.c

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C
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/* LPC CRP enabler / CRC fixer all-in-one
*
* BSD Licence
*
* (c) by Sec <sec@42.org> 6/2011
*/
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
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#include <stdint.h>
#include <getopt.h>
#define CRC_CNT 7
#define CRC_T uint32_t
#define CRP_OFF 0x2fc
#define CRP_T uint32_t
#define CRP_MAX 4
int main(int argc, char *argv[]) {
FILE *fp;
CRC_T buf[CRC_CNT];
CRC_T crc = 0;
CRP_T magic[]= { 0x0, 0x12345678, 0x87654321, 0x43218765, 0x4e697370};
CRP_T crp;
char *prog;
char c; /* for getopt */
/* Default values */
char verbose=0; // be silent
char do_crc= 0; // do fix crc
int do_crp=-1; // do not change crp
/* init section */
prog=argv[0];
if(!prog)prog="lpcfix";
if(strrchr(prog,'/')){
prog=strrchr(argv[0],'/');
prog++;
}
/* The big getopt loop */
while ((c = getopt(argc, argv, "vcp:nh")) != (char)EOF)
switch (c) {
case 'c':
do_crc = 1;
break;
case 'v':
verbose++;
break;
case 'p':
do_crp = atoi(optarg);
break;
case 'h':
default:
fprintf(stderr, "Usage: %s [options]\n\n"
"This program fixes the CRC field for LPC firmware and optionally\n"
"enables/disables the content read protection flags\n"
"\n\n"
"-n Do not change CRC information\n"
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"-c Fix CRC\n"
"-v Be verbose (-v -v = even more)\n"
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"-p mode Enable CRP (Content read protection) mode\n"
"-h This help\n\n"
"CRP modes valid:\n"
"0 Disable CRP\n"
"1-3 Enable CRP 1-3\n"
"4 Enable NO_ISP\n"
"\n",prog);
exit(255);
}
argc -= optind; argv += optind;
if (argc !=1){
fprintf(stderr,"Error: No filename given!\n");
exit(254);
};
if(do_crp>CRP_MAX){
fprintf(stderr, "CRP %d is not allowed\n",do_crp);
exit(254);
};
if ((fp = fopen(argv[0],"r+b")) == NULL){
fprintf(stderr,"Error: Can't open file %s\n",argv[0]);
exit(253);
}
if (do_crc) {
if (fread(buf,sizeof(CRC_T),CRC_CNT,fp) != CRC_CNT){
fprintf(stderr,"Error: Read failed\n");
exit(253);
}
for (int idx=0; idx<CRC_CNT; idx++) {
crc += buf[idx];
}
crc = (~crc) + 1;
if(verbose)
printf("New CRC is: 0x%08x\n",crc);
if (fseek(fp,CRC_CNT*sizeof(CRC_T),SEEK_SET) != 0){
fprintf(stderr, "Error: Seek failed\n");
exit(253);
}
// Write CRC
if (do_crc)
if (fwrite(&crc,sizeof(CRC_T),1,fp) != 1){
fprintf(stderr, "Error: CRC write failed\n");
exit(253);
}
};
if (verbose){
if (fseek(fp,CRP_OFF,SEEK_SET) != 0){
fprintf(stderr, "Error: CRP Seek failed\n");
exit(253);
}
if (fread(&crp,sizeof(CRP_T),1,fp) != 1){
fprintf(stderr,"Error: CRP Read failed\n");
exit(253);
}
int idx;
for (idx=1; idx <= CRP_MAX; idx++) {
if(crp==magic[idx])
break;
}
if(idx>CRP_MAX)
idx=0;
printf("Curent CRP: 0x%08x (%d)\n", crp, idx);
};
if (do_crp!=-1){
crp=magic[do_crp];
if (fseek(fp,CRP_OFF,SEEK_SET) != 0){
fprintf(stderr, "Error: CRP Seek failed\n");
exit(253);
}
if (fwrite(&crp,sizeof(CRP_T),1,fp) != 1){
fprintf(stderr,"Error: CRP Write failed\n");
exit(253);
}
printf("New CRP value: 0x%08x\n", crp);
};
fclose(fp);
return 0;
}