diff --git a/import-layers/yocto-poky/meta/classes/siteinfo.bbclass b/import-layers/yocto-poky/meta/classes/siteinfo.bbclass
index 50141a3..6eca004 100644
--- a/import-layers/yocto-poky/meta/classes/siteinfo.bbclass
+++ b/import-layers/yocto-poky/meta/classes/siteinfo.bbclass
@@ -36,7 +36,11 @@
         "mips": "endian-big bit-32 mips-common",
         "mips64": "endian-big bit-64 mips-common",
         "mips64el": "endian-little bit-64 mips-common",
+        "mipsisa64r6": "endian-big bit-64 mips-common",
+        "mipsisa64r6el": "endian-little bit-64 mips-common",
         "mipsel": "endian-little bit-32 mips-common",
+        "mipsisa32r6": "endian-big bit-32 mips-common",
+        "mipsisa32r6el": "endian-little bit-32 mips-common",
         "powerpc": "endian-big bit-32 powerpc-common",
         "nios2": "endian-little bit-32 nios2-common",
         "powerpc64": "endian-big bit-64 powerpc-common",
@@ -107,6 +111,14 @@
         "x86_64-mingw32": "bit-64",
     }
 
+    # Add in any extra user supplied data which may come from a BSP layer, removing the
+    # need to always change this class directly
+    extra_siteinfo = (d.getVar("SITEINFO_EXTRA_DATAFUNCS", True) or "").split()
+    for m in extra_siteinfo:
+        call = m + "(archinfo, osinfo, targetinfo, d)"
+        locs = { "archinfo" : archinfo, "osinfo" : osinfo, "targetinfo" : targetinfo, "d" : d}
+        archinfo, osinfo, targetinfo = bb.utils.better_eval(call, locs)
+
     hostarch = d.getVar("HOST_ARCH", True)
     hostos = d.getVar("HOST_OS", True)
     target = "%s-%s" % (hostarch, hostos)
@@ -145,7 +157,7 @@
         bb.fatal("Please add your architecture to siteinfo.bbclass")
 }
 
-def siteinfo_get_files(d, no_cache = False):
+def siteinfo_get_files(d, aclocalcache = False):
     sitedata = siteinfo_data(d)
     sitefiles = ""
     for path in d.getVar("BBPATH", True).split(":"):
@@ -154,11 +166,17 @@
             if os.path.exists(filename):
                 sitefiles += filename + " "
 
-    if no_cache: return sitefiles
+    if not aclocalcache:
+        return sitefiles
 
-    # Now check for siteconfig cache files
-    # Use the files copied to the aclocal cache generated by autotools.bbclass
-    # to avoid races
+    # Now check for siteconfig cache files in the directory setup by autotools.bbclass to
+    # avoid races.
+    #
+    # ACLOCALDIR may or may not exist so cache should only be set to True from autotools.bbclass
+    # after files have been copied into this location. To do otherwise risks parsing/signature
+    # issues and the directory being created/removed whilst this code executes. This can happen
+    # when a multilib recipe is parsed along with its base variant which may be running at the time
+    # causing rare but nasty failures
     path_siteconfig = d.getVar('ACLOCALDIR', True)
     if path_siteconfig and os.path.isdir(path_siteconfig):
         for i in os.listdir(path_siteconfig):
@@ -166,7 +184,6 @@
                 continue
             filename = os.path.join(path_siteconfig, i)
             sitefiles += filename + " "
-
     return sitefiles
 
 #