target_flash_erase: Do not crash when requesting erase of unavailable flash.

Allow to erase from command line.

src/platforms/pc/cl_utils.c

@@ -121,6 +121,7 @@ static void cl_help(char **argv, BMP_CL_OPTIONS_t *opt)
 	printf("\t-n\t\t:  Exit immediate if no device found\n");
 	printf("\tRun mode related options:\n");
 	printf("\t-t\t\t: Scan SWD, with no target found scan jtag and exit\n");
+	printf("\t-E\t\t: Erase flash until flash end or for given size\n");
 	printf("\t-V\t\t: Verify flash against binary file\n");
 	printf("\t-r\t\t: Read flash and write to binary file\n");
 	printf("\t-R\t\t: Reset device\n");
@@ -141,7 +142,7 @@ void cl_init(BMP_CL_OPTIONS_t *opt, int argc, char **argv)
 	opt->opt_target_dev = 1;
 	opt->opt_flash_start = 0x08000000;
 	opt->opt_flash_size = 16 * 1024 *1024;
-	while((c = getopt(argc, argv, "hv::s:c:nN:tVta:S:jrR")) != -1) {
+	while((c = getopt(argc, argv, "Ehv::s:c:nN:tVta:S:jrR")) != -1) {
 		switch(c) {
 		case 'c':
 			if (optarg)
@@ -164,6 +165,9 @@ void cl_init(BMP_CL_OPTIONS_t *opt, int argc, char **argv)
 			if (optarg)
 				opt->opt_serial = optarg;
 			break;
+		case 'E':
+			opt->opt_mode = BMP_MODE_FLASH_ERASE;
+			break;
 		case 't':
 			opt->opt_mode = BMP_MODE_TEST;
 			break;
@@ -273,6 +277,16 @@ int cl_execute(BMP_CL_OPTIONS_t *opt)
 		map.size = opt->opt_flash_size;
 	if (opt->opt_mode == BMP_MODE_RESET) {
 		target_reset(t);
+	} else if (opt->opt_mode == BMP_MODE_FLASH_ERASE) {
+		DEBUG("Erase %zu bytes at 0x%08" PRIx32 "\n", opt->opt_flash_size,
+			  opt->opt_flash_start);
+		unsigned int erased = target_flash_erase(t, opt->opt_flash_start,
+												 opt->opt_flash_size);
+		if (erased) {
+			DEBUG("Erased failed!\n");
+			goto free_map;
+		}
+		target_reset(t);
 	} else if (opt->opt_mode == BMP_MODE_FLASH_WRITE) {
 		DEBUG("Erase    %zu bytes at 0x%08" PRIx32 "\n", map.size,
 			  opt->opt_flash_start);

src/platforms/pc/cl_utils.h

@@ -28,6 +28,7 @@ enum bmp_cl_mode {
 	BMP_MODE_DEBUG,
 	BMP_MODE_TEST,
 	BMP_MODE_RESET,
+	BMP_MODE_FLASH_ERASE,
 	BMP_MODE_FLASH_WRITE,
 	BMP_MODE_FLASH_READ,
 	BMP_MODE_FLASH_VERIFY

src/target/target.c

@@ -237,6 +237,10 @@ int target_flash_erase(target *t, target_addr addr, size_t len)
 	int ret = 0;
 	while (len) {
 		struct target_flash *f = flash_for_addr(t, addr);
+		if (!f) {
+			DEBUG("Erase stopped at 0x%06" PRIx32 "\n", addr);
+			return ret;
+		}
 		size_t tmptarget = MIN(addr + len, f->start + f->length);
 		size_t tmplen = tmptarget - addr;
 		ret |= f->erase(f, addr, tmplen);