diff -up powerpc-utils-1.3.8/src/sys_ident.c.me powerpc-utils-1.3.8/src/sys_ident.c
--- powerpc-utils-1.3.8/src/sys_ident.c.me	2020-10-06 15:35:56.620350621 +0200
+++ powerpc-utils-1.3.8/src/sys_ident.c	2020-10-06 15:36:31.468849936 +0200
@@ -267,7 +267,8 @@ print_proc_sn_value(void)
 						"parameter from RTAS\n");
 				return 2;
 			}
-			pos = strstr(buf, "uid=");
+			/* Ignore length field (first 2 bytes) */
+			pos = strstr(buf +2, "uid=");
 			if (pos == NULL) {
 				fprintf(stderr, "Parameter from RTAS does "
 						"not contain uid\n");