44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
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/* netboot
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*
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* $Log: genprom.c,v $
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* Revision 1.1 1993/07/08 16:03:58 brezak
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* Diskless boot prom code from Jim McKim (mckim@lerc.nasa.gov)
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*
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* Revision 1.2 1993/06/30 20:15:38 mckim
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* Display code size.
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*
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* Revision 1.1.1.1 1993/05/28 11:41:06 mckim
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* Initial version.
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*
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*
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* Read a binary image of a bios extension, generate the
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* appropriate block count and checksum and write them
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* into the rom image (replacing 2nd and 5th bytes)
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* The binary image should be sized before being filtered
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* through this routine.
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*/
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#include <stdio.h>
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#define USE_SIZE ROM_SIZE
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#define PROM_SIZE 0x10000
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main() {
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char w[PROM_SIZE], ck;
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int i, sum;
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memset(w, 0xff, PROM_SIZE);
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i = fread(w, 1, PROM_SIZE, stdin);
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fprintf(stderr, "bios extension size: %d (0x%x), read %d bytes\n",
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USE_SIZE, USE_SIZE, i);
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w[2] = USE_SIZE / 512;
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for (sum=0, i=0; i<USE_SIZE; i++) {
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sum += w[i];
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}
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w[5] = -sum;
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for (ck=0, i=0; i<USE_SIZE; i++) {
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ck += w[i];
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}
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fwrite(w, 1, PROM_SIZE, stdout);
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}
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