view helpers/mokosrec2bin.c @ 267:10b3a6876273

fc-target.h preprocessor symbols: introduce CONFIG_TARGET_LEO_RFFE Out of our currently existing supported targets, Leonardo and Tango use TI's classic Leonardo RFFE wiring. However, we would like to use the same quadband RFFE with the same classic wiring on our FreeCalypso Libre Dumbphone handset, and also on the planned development board that will serve as a stepping stone toward that goal. Therefore, we introduce the new CONFIG_TARGET_LEO_RFFE preprocessor symbol, and conditionalize on this symbol in tpudrv12.h, instead of a growing || of different targets.
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 09 Jun 2021 07:26:51 +0000
parents 1fb47f5b597a
children
line wrap: on
line source

/*
 * GSM device firmwares that are built with TI's TMS470 toolchain in TI's
 * canonical way come out in TI's *.m0 format produced by TI's hex470 tool.
 * TI's *.m0 is a variant of the classic S-record format from Motorola,
 * but the specific variant depends on the -memwidth and -romwidth options
 * with which the hex470 tool is run.
 *
 * In TI's canonical architecture (as opposed to Mot/Compal's heavily modified
 * version) this hex470 tool is run with -memwidth 16 -romwidth 16 options,
 * and the *.m0 file comes out in the format variant which we have nicknamed
 * "moko-style" after its most famous user.  This variant is a byte-reversed
 * S-record format in that each 16-bit word is byte-reversed relative to the
 * native byte order of the ARM7 processor.  (This strange byte order actually
 * makes some sense if one views the image as a long array of 16-bit hex
 * values; 16 bits is the width of the flash memory on Calypso GSM devices and
 * thus the natural unit size for flash programming.)
 *
 * The present mokosrec2bin utility converts these "moko-style" S-record files
 * to straight binary, a conversion that includes flipping the order of bytes.
 */

#include <sys/types.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>

char *infname;
FILE *inf, *outf;
u_char fillbyte;
char srecbuf[80];
u_char srecbin[40];
int lineno, state;
u_long lastaddr;

u_char header[6] = {0x06, 0x00, 0x00, 'H', 'D', 'R'};

decode_hex_byte(s)
	char *s;
{
	register int u, l;

	if (!isxdigit(s[0]) || !isxdigit(s[1]))
		return(-1);
	if (isdigit(s[0]))
		u = s[0] - '0';
	else if (isupper(s[0]))
		u = s[0] - 'A' + 10;
	else
		u = s[0] - 'a' + 10;
	if (isdigit(s[1]))
		l = s[1] - '0';
	else if (isupper(s[1]))
		l = s[1] - 'A' + 10;
	else
		l = s[1] - 'a' + 10;
	return((u << 4) | l);
}

srec2bin()
{
	register int i, l, b;

	l = decode_hex_byte(srecbuf + 2);
	if (l < 1) {
		fprintf(stderr, "%s line %d: S-record length octet is bad\n",
			infname, lineno);
		exit(1);
	}
	srecbin[0] = l;
	if (l > 35) {
		fprintf(stderr,
			"%s line %d: S-record is longer than expected\n",
			infname, lineno);
		exit(1);
	}
	for (i = 1; i <= l; i++) {
		b = decode_hex_byte(srecbuf + i*2 + 2);
		if (b < 0) {
			fprintf(stderr, "%s line %d: hex decode error\n",
				infname, lineno);
			exit(1);
		}
		srecbin[i] = b;
	}
	return(0);
}

srec_cksum()
{
	u_char accum;
	register int i, len;

	len = srecbin[0] + 1;
	accum = 0;
	for (i = 0; i < len; i++)
		accum += srecbin[i];
	if (accum != 0xFF) {
		fprintf(stderr, "%s line %d: bad checksum\n", infname, lineno);
		exit(1);
	}
	return(0);
}

main(argc, argv)
	char **argv;
{
	register int i;
	u_long curaddr;
	int datalen;

	if (argc < 3 || argc > 4) {
usage:		fprintf(stderr, "usage: %s input.m0 output.bin [fill-byte]\n",
			argv[0]);
		exit(1);
	}
	infname = argv[1];
	inf = fopen(infname, "r");
	if (!inf) {
		perror(infname);
		exit(1);
	}
	if (argc > 3) {
		i = decode_hex_byte(argv[3]);
		if (i >= 0)
			fillbyte = i;
		else
			goto usage;
	} else
		fillbyte = 0xFF;

	state = 0;
	for (lineno = 1; ; lineno++) {
		if (!fgets(srecbuf, sizeof srecbuf, inf)) {
			fprintf(stderr, "%s: premature EOF\n", infname);
			exit(1);
		}
		if (srecbuf[0] != 'S') {
			fprintf(stderr, "%s line %d: not an S-record\n",
				infname, lineno);
			exit(1);
		}
		switch (srecbuf[1]) {
		case '0':
			if (state == 0)
				break;
			else
				goto badtype;
		case '3':
			if (state == 0)
				goto badtype;
			else
				break;
		case '7':
			if (state == 2)
				break;
			else
				goto badtype;
		default:
		badtype:
			fprintf(stderr,
				"%s line %d: S-record type unexpected\n",
				infname, lineno);
			exit(1);
		}
		srec2bin();
		srec_cksum();
		if (state == 0) {
			if (bcmp(srecbin, header, 6)) {
				fprintf(stderr, "%s: expected header missing\n",
					infname);
				exit(1);
			}
			state = 1;
			continue;
		}
		switch (srecbuf[1]) {
		case '3':
			if (srecbin[0] < 6) {
				fprintf(stderr,
					"%s line %d: S3 record is too short\n",
					infname, lineno);
				exit(1);
			}
			curaddr = (srecbin[1] << 24) | (srecbin[2] << 16) |
				  (srecbin[3] << 8) | srecbin[4];
			if (curaddr & 1) {
				fprintf(stderr, "%s line %d: odd address\n",
					infname, lineno);
				exit(1);
			}
			datalen = srecbin[0] - 5;
			if (datalen & 1) {
				fprintf(stderr, "%s line %d: odd data length\n",
					infname, lineno);
				exit(1);
			}
			if (state < 2) {
				outf = fopen(argv[2], "w");
				if (!outf) {
					perror(argv[2]);
					exit(1);
				}
				state = 2;
				lastaddr = 0;
			}
			if (curaddr < lastaddr) {
				fprintf(stderr,
					"%s line %d: address going backwards\n",
					infname, lineno);
				exit(1);
			}
			while (lastaddr < curaddr) {
				putc(fillbyte, outf);
				lastaddr++;
			}
			for (i = 0; i < datalen; i += 2) {
				putc(srecbin[i + 6], outf);
				putc(srecbin[i + 5], outf);
			}
			lastaddr = curaddr + datalen;
			continue;
		case '7':
			fclose(outf);
			exit(0);
		default:
			abort();
		}
	}
}