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/* $NetBSD: genprom.c,v 1.3 1994/10/27 04:21:13 cgd Exp $ */
/*
* Read a binary image of a bios extension, generate the
* appropriate block count and checksum and write them
* into the rom image (replacing 2nd and 5th bytes)
* The binary image should be sized before being filtered
* through this routine.
*/
#include <stdio.h>
#define USE_SIZE ROM_SIZE
#define PROM_SIZE 0x10000
main() {
char w[PROM_SIZE], ck;
int i, sum;
memset(w, 0xff, PROM_SIZE);
i = fread(w, 1, PROM_SIZE, stdin);
fprintf(stderr, "bios extension size: %d (0x%x), read %d bytes\n",
USE_SIZE, USE_SIZE, i);
w[2] = USE_SIZE / 512;
for (sum=0, i=0; i<USE_SIZE; i++) {
sum += w[i];
}
w[5] = -sum;
for (ck=0, i=0; i<USE_SIZE; i++) {
ck += w[i];
}
fwrite(w, 1, PROM_SIZE, stdout);
}
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