openwrt/target/linux/brcm47xx/patches-4.9/400-mtd-bcm47xxpart-get-nvram.patch

--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -103,6 +103,7 @@ static int bcm47xxpart_parse(struct mtd_
 	int trx_num = 0; /* Number of found TRX partitions */
 	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
 	int err;
+	bool found_nvram = false;
 
 	/*
 	 * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
@@ -284,12 +285,23 @@ static int bcm47xxpart_parse(struct mtd_
 		if (buf[0] == NVRAM_HEADER) {
 			bcm47xxpart_add_part(&parts[curr_part++], "nvram",
 					     master->size - blocksize, 0);
+			found_nvram = true;
 			break;
 		}
 	}
 
 	kfree(buf);
 
+	if (!found_nvram) {
+		pr_err("can not find a nvram partition reserve last block\n");
+		bcm47xxpart_add_part(&parts[curr_part++], "nvram_guess",
+				     master->size - blocksize * 2, MTD_WRITEABLE);
+		for (i = 0; i < curr_part; i++) {
+			if (parts[i].size + parts[i].offset == master->size)
+				parts[i].offset -= blocksize * 2;
+		}
+	}
+
 	/*
 	 * Assume that partitions end at the beginning of the one they are
 	 * followed by.