--- bootp-133.6/bootplib/nbimages.c-    2006-02-09 14:03:38.000000000 +0000
+++ bootp-133.6/bootplib/nbimages.c     2006-02-10 10:31:18.000000000 +0000
@@ -83,6 +83,11 @@
 myCFStringArrayToCStringArray(CFArrayRef arr, char * buffer, int * buffer_size,
                              int * ret_count)
 {
+    if(isA_CFArray(arr)==NULL)
+    {
+      //we can't continue, this isn't a CFArray
+      return(FALSE);
+    }
     int                count = CFArrayGetCount(arr);
     int        i;
     char *     offset = NULL;
@@ -608,21 +613,29 @@
     archlist_prop = CFDictionaryGetValue(plist, kNetBootImageInfoArchitectures);
     if (archlist_prop != NULL) {
        int archlist_count;
-
+       if (isA_CFArray(archlist_prop)==NULL)
+       {
+               //broken plist entry, assume this is an old PPC-only NBI
+         syslog(LOG_WARNING,"broken NBI plist, assuming old PPC image...");
+               CFMutableArrayRef ppcArray=CFArrayCreateMutable(kCFAllocatorDefault,1,NULL);
+               CFStringRef ppcString=CFSTR("ppc");
+               CFArrayAppendValue(ppcArray,ppcString);
+               archlist_prop=CFArrayCreateCopy(kCFAllocatorDefault,ppcArray);
+       }
        if (myCFStringArrayToCStringArray(archlist_prop, 
-                                         NULL, &archlist_space,
-                                         &archlist_count) == FALSE) {
-           fprintf(stderr, 
-                   "Couldn't calculate Archlist length\n");
-           goto failed;
+                                 NULL, &archlist_space,
+                                 &archlist_count) == FALSE) {
+               fprintf(stderr, 
+                       "Couldn't calculate Archlist length\n");
+               goto failed;
        }
        if (archlist_count == 0) {
-           fprintf(stderr, 
-                   "Empty ArchList array");
-           goto failed;
+               fprintf(stderr, 
+                       "Empty ArchList array");
+               goto failed;
        }
        tail_space += archlist_space;
-    }
+       }
 
     /* bootfile */
     bootfile_prop = CFDictionaryGetValue(plist, kNetBootImageInfoBootFile);