mtd: allow writing Seama files to "firmware" on Broadcom targets

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 48534

package/system/mtd/src/trx.c

@@ -44,6 +44,8 @@ struct trx_header {
 	uint32_t offsets[3];    /* Offsets of partitions from start of header */
 };
 
+#define SEAMA_MAGIC	0x17a4a35e
+
 #if __BYTE_ORDER == __BIG_ENDIAN
 #define STORE32_LE(X)           ((((X) & 0x000000FF) << 24) | (((X) & 0x0000FF00) << 8) | (((X) & 0x00FF0000) >> 8) | (((X) & 0xFF000000) >> 24))
 #elif __BYTE_ORDER == __LITTLE_ENDIAN
@@ -118,6 +120,10 @@ trx_check(int imagefd, const char *mtd, char *buf, int *len)
 		return 0;
 	}
 
+	/* Allow writing Seama files to firmware without an extra validation */
+	if (trx->magic == SEAMA_MAGIC)
+		return 1;
+
 	if (trx->magic != TRX_MAGIC || trx->len < sizeof(struct trx_header)) {
 		if (quiet < 2) {
 			fprintf(stderr, "Bad trx header\n");