--- yaboot-1.3.13/second/prom.c~	2003-11-04 09:13:17.000000000 +0000
+++ yaboot-1.3.13/second/prom.c	2005-07-29 13:19:35.000000000 +0100
@@ -547,7 +547,11 @@ prom_sleep (int seconds)
 void *
 prom_claim (void *virt, unsigned int size, unsigned int align)
 {
-     return call_prom ("claim", 3, 1, virt, size, align);
+     void *ret = call_prom ("claim", 3, 1, virt, size, align);
+     /* Pegasos II SmartFirmware returns zero for failure, usefully */
+     if (virt && !ret)
+	  ret = (void *)-1;
+     return ret;
 }
 
 void