diff --git a/devIocStats/os/RTEMS/devIocStatsOSD.h b/devIocStats/os/RTEMS/devIocStatsOSD.h
index 00d5787..ed0cbf9 100644
--- a/devIocStats/os/RTEMS/devIocStatsOSD.h
+++ b/devIocStats/os/RTEMS/devIocStatsOSD.h
@@ -43,8 +43,21 @@
  *              info of 100% free (but 100% of 0 is still 0).
  *
  */
+/*
+ * Updated to RTEMS 6
+ *   Contemporary Software
+ *    Chris Johns <chris@contemporary.software>
+ */
+#include "epicsVersion.h"
+
+#define RTEMS_VERSION_INT  \
+  VERSION_INT(__RTEMS_MAJOR__, __RTEMS_MINOR__, __RTEMS_REVISION__, 0)
+
+#if RTEMS_VERSION_INT <= VERSION_INT(5, 0, 0, 0)
+/*
+ * This define effects rtems.h includes on 4.10 and earlier
+ */
 #define __RTEMS_VIOLATE_KERNEL_VISIBILITY__
-#include <rtems.h>
 #include <bsp.h>
 #include <rtems/libcsupport.h>
 #include <rtems/libio_.h>
@@ -53,6 +66,9 @@
 #include <sys/socket.h>
 #include <net/if.h>
 #include <net/if_var.h>
+#endif /* RTEMS 5 and earlier */
+
+#include <rtems.h>
 
 #undef malloc
 #undef free
@@ -67,17 +83,30 @@
 #include <string.h>
 #include <stdlib.h>
 
-#include "epicsVersion.h"
+#if RTEMS_LEGACY_STACK
 
-#define RTEMS_VERSION_INT                                                      \
-  VERSION_INT(__RTEMS_MAJOR__, __RTEMS_MINOR__, __RTEMS_REVISION__, 0)
+#include <rtems/rtems_bsdnet.h>
 
 #define sysBootLine rtems_bsdnet_bootp_cmdline
+#else
+#define sysBootLine "BOOTP cmdline not supported"
+#endif
 /* Override default STARTUP environment variable to use INIT */
 #undef STARTUP
 #define STARTUP "INIT"
+
 #define CLUSTSIZES 2 /* only regular mbufs and clusters */
 
+#if RTEMS_VERSION_INT >= VERSION_INT(6, 0, 0, 0)
+
+#define NO_OF_CPUS rtems_configuration_get_maximum_processors()
+
+#include <bsp/bootcard.h>
+static inline void reboot(int val) {
+  (void) val;
+  bsp_reset();
+}
+#else /* RTEMS 6 or later */
 #ifdef RTEMS_BSP_PGM_EXEC_AFTER /* only defined on uC5282 */
 #define reboot(x) bsp_reset(0)
 #elif (defined(__PPC__) && RTEMS_VERSION_INT > VERSION_INT(4, 9, 0, 0))
@@ -91,3 +120,4 @@
 #else
 #define reboot(x) rtemsReboot()
 #endif
+#endif /* RTEMS 6 or later */
diff --git a/devIocStats/os/RTEMS/osdClustInfo.c b/devIocStats/os/RTEMS/osdClustInfo.c
index 589d0f3..1e07474 100644
--- a/devIocStats/os/RTEMS/osdClustInfo.c
+++ b/devIocStats/os/RTEMS/osdClustInfo.c
@@ -56,11 +56,65 @@
 
 #include <devIocStats.h>
 
-/* This would otherwise need _KERNEL to be defined... */
-extern struct mbstat mbstat;
+#include <sys/param.h>
+#include <sys/mbuf.h>
 
 int devIocStatsInitClusterInfo(void) { return 0; }
 
+#if RTEMS_LIBBSD_STACK
+
+#include <memstat.h>
+
+int devIocStatsGetClusterInfo(int pool, clustInfo *pval) {
+  struct memory_type_list *mtlp;
+  struct memory_type *mtp;
+
+  if (pool == DATA_POOL) {
+    return -1;
+  }
+
+  mtlp = memstat_mtl_alloc();
+  if (mtlp == NULL) {
+    return -1;
+  }
+
+  if (memstat_sysctl_all(mtlp, 0) < 0) {
+    memstat_mtl_free(mtlp);
+    return -1;
+  }
+
+  mtp = memstat_mtl_find(mtlp, ALLOCATOR_UMA, MBUF_MEM_NAME);
+  if (mtp == NULL) {
+    memstat_mtl_free(mtlp);
+    return -1;
+  }
+
+  (*pval)[0][0] = memstat_get_size(mtp);
+  (*pval)[0][1] = memstat_get_count(mtp);
+  (*pval)[0][2] = memstat_get_free(mtp);
+  (*pval)[0][3] = (*pval)[0][1] - (*pval)[0][2];
+
+  mtp = memstat_mtl_find(mtlp, ALLOCATOR_UMA, MBUF_CLUSTER_MEM_NAME);
+  if (mtp == NULL) {
+    memstat_mtl_free(mtlp);
+    return -1;
+  }
+
+  (*pval)[0][0] = memstat_get_size(mtp);
+  (*pval)[0][1] = memstat_get_count(mtp);
+  (*pval)[0][2] = memstat_get_free(mtp);
+  (*pval)[0][3] = (*pval)[0][1] - (*pval)[0][2];
+
+  memstat_mtl_free(mtlp);
+
+  return 0;
+}
+
+#else /* RTEMS_LIBBSD_STACK */
+
+/* This would otherwise need _KERNEL to be defined... */
+extern struct mbstat mbstat;
+
 int devIocStatsGetClusterInfo(int pool, clustInfo *pval) {
   if (pool == DATA_POOL)
     return -1;
@@ -86,3 +140,5 @@ int devIocStatsGetClusterUsage(int pool, int *pval) {
 
   return 0;
 }
+
+#endif /* RTEMS_LIBBSD_STACK */
diff --git a/devIocStats/os/RTEMS/osdCpuUsage.c b/devIocStats/os/RTEMS/osdCpuUsage.c
index 4963b8a..701ff5a 100644
--- a/devIocStats/os/RTEMS/osdCpuUsage.c
+++ b/devIocStats/os/RTEMS/osdCpuUsage.c
@@ -48,6 +48,38 @@
 
 #include <devIocStats.h>
 
+static double prev_total = 0;
+static double prev_idle = 0;
+
+#if __RTEMS_MAJOR__ >= 6
+
+#include <sys/resource.h>
+
+static double oldActiveUsage;
+static double oldIdleUsage;
+
+/*
+ * See IEEE Std 1003.1-1988 (“POSIX.1”) for getrusage()
+ */
+static void cpu_ticks(double *total, double *idle) {
+  struct rusage stats;
+  double curActive;
+  double curIdle;
+  getrusage(RUSAGE_SELF, &stats);
+  curActive = (double) stats.ru_utime.tv_sec + stats.ru_utime.tv_usec / 1e6;
+  curIdle = (double) stats.ru_stime.tv_sec + stats.ru_stime.tv_usec / 1e6;
+  *idle = curIdle - oldIdleUsage;
+  *total = *idle + (curActive - oldActiveUsage);
+  oldActiveUsage = curActive;
+  oldIdleUsage = curIdle;
+}
+
+#else /* RTEMS 6 or later */
+
+/*
+ * Direct access to the Object information table
+ */
+
 #if (__RTEMS_MAJOR__ > 4) || (__RTEMS_MAJOR__ == 4 && __RTEMS_MINOR__ > 7)
 typedef char objName[13];
 #define RTEMS_OBJ_GET_NAME(tc, name)                                           \
@@ -79,9 +111,6 @@ typedef char *objName;
  * from the RTEMS source.
  */
 
-static double prev_total = 0;
-static double prev_idle = 0;
-
 static void cpu_ticks(double *total, double *idle) {
   Objects_Information *obj;
   Thread_Control *tc;
@@ -116,6 +145,8 @@ static void cpu_ticks(double *total, double *idle) {
   }
 }
 
+#endif /* RTEMS 6 or later */
+
 int devIocStatsInitCpuUsage(void) {
   cpu_ticks(&prev_total, &prev_idle);
 #ifdef SSRLAPPSMISCUTILS
diff --git a/devIocStats/os/RTEMS/osdCpuUtilization.c b/devIocStats/os/RTEMS/osdCpuUtilization.c
index c77770f..c918ade 100644
--- a/devIocStats/os/RTEMS/osdCpuUtilization.c
+++ b/devIocStats/os/RTEMS/osdCpuUtilization.c
@@ -27,7 +27,6 @@ int devIocStatsInitCpuUtilization(loadInfo *pval) {
   return 0;
 }
 
-/* FIXME: This relies on the device support calling it after CpuUsage */
 int devIocStatsGetCpuUtilization(loadInfo *pval) {
   pval->iocLoad = pval->cpuLoad;
   return 0;
diff --git a/devIocStats/os/RTEMS/osdFdUsage.c b/devIocStats/os/RTEMS/osdFdUsage.c
index 1d52d82..93e64a0 100644
--- a/devIocStats/os/RTEMS/osdFdUsage.c
+++ b/devIocStats/os/RTEMS/osdFdUsage.c
@@ -38,9 +38,16 @@
 
 #include <devIocStats.h>
 
+#if __RTEMS_MAJOR__ >= 6
+#include <rtems/libio_.h>
+#endif /* _RTEMS_MAJOR__ >= 6 */
+
 int devIocStatsInitFDUsage(void) { return 0; }
 
 int devIocStatsGetFDUsage(fdInfo *pval) {
+#if __RTEMS_MAJOR__ >= 6
+  pval->used = rtems_libio_count_open_iops();
+#else
   int i, tot;
 
   for (tot = 0, i = 0; i < rtems_libio_number_iops; i++) {
@@ -48,6 +55,7 @@ int devIocStatsGetFDUsage(fdInfo *pval) {
       tot++;
   }
   pval->used = tot;
+#endif /* _RTEMS_MAJOR__ >= 6 */
   pval->max = rtems_libio_number_iops;
   return 0;
 }
diff --git a/devIocStats/os/RTEMS/osdIFErrors.c b/devIocStats/os/RTEMS/osdIFErrors.c
index e01e729..d390609 100644
--- a/devIocStats/os/RTEMS/osdIFErrors.c
+++ b/devIocStats/os/RTEMS/osdIFErrors.c
@@ -40,12 +40,47 @@
 
 #include <devIocStats.h>
 
+int devIocStatsInitIFErrors(void) { return 0; }
+
+#if RTEMS_LIBBSD_STACK
+
+#include <ifaddrs.h>
+#include <net/if.h>
+
+int devIocStatsGetIFErrors(ifErrInfo *pval) {
+  struct ifaddrs *ifap, *ifa;
+
+  /* add all interfaces' errors */
+  pval->ierrors = 0;
+  pval->oerrors = 0;
+
+  if (getifaddrs(&ifap) != 0) {
+    return -1;
+  }
+
+  for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
+    if (ifa->ifa_addr->sa_family != AF_LINK) {
+      continue;
+    }
+#define	IFA_STAT(s)	(((struct if_data *)ifa->ifa_data)->ifi_ ## s)
+    pval->ierrors += IFA_STAT(ierrors);
+    pval->oerrors += IFA_STAT(oerrors);
+  }
+
+  freeifaddrs(ifap);
+
+  return 0;
+}
+
+#else /* RTEMS_LIBBSD_STACK */
+
+#include <net/if_var.h>
+
 /* This would otherwise need _KERNEL to be defined... */
 extern struct ifnet *ifnet;
 
-int devIocStatsInitIFErrors(void) { return 0; }
-
 int devIocStatsGetIFErrors(ifErrInfo *pval) {
+
   struct ifnet *ifp;
 
   /* add all interfaces' errors */
@@ -57,3 +92,5 @@ int devIocStatsGetIFErrors(ifErrInfo *pval) {
   }
   return 0;
 }
+
+#endif /* RTEMS_LIBBSD_STACK */
diff --git a/devIocStats/os/RTEMS/osdSuspTasks.c b/devIocStats/os/RTEMS/osdSuspTasks.c
index 9679d53..aec6ead 100644
--- a/devIocStats/os/RTEMS/osdSuspTasks.c
+++ b/devIocStats/os/RTEMS/osdSuspTasks.c
@@ -43,6 +43,7 @@
 int devIocStatsInitSuspTasks(void) { return 0; }
 
 int devIocStatsGetSuspTasks(int *pval) {
+#if __RTEMS_MAJOR__ < 6
   Objects_Control *o;
   Objects_Id id = OBJECTS_ID_INITIAL_INDEX;
   Objects_Id nid;
@@ -59,4 +60,7 @@ int devIocStatsGetSuspTasks(int *pval) {
   }
   *pval = n;
   return 0;
+#else /* __RTEMS_MAJOR__ < 6 */
+  return -1;
+#endif /* __RTEMS_MAJOR__ < 6 */
 }
diff --git a/devIocStats/os/RTEMS/osdWorkspaceUsage.c b/devIocStats/os/RTEMS/osdWorkspaceUsage.c
index 9f7518a..1b2e4e6 100644
--- a/devIocStats/os/RTEMS/osdWorkspaceUsage.c
+++ b/devIocStats/os/RTEMS/osdWorkspaceUsage.c
@@ -31,20 +31,25 @@ int devIocStatsInitWorkspaceUsage(void) { return 0; }
 
 int devIocStatsGetWorkspaceUsage(memInfo *pval) {
   Heap_Information_block info;
-#ifdef RTEMS_PROTECTED_HEAP
+#if __RTEMS_MAJOR__ >= 6
+  malloc_info(&info);
+  pval->numBytesTotal = info.Stats.size;
+#else /* __RTEMS_MAJOR__ >= 6 */
+ #ifdef RTEMS_PROTECTED_HEAP
   _Protected_heap_Get_information(&_Workspace_Area, &info);
-#else  /* RTEMS_PROTECTED_HEAP */
+ #else  /* RTEMS_PROTECTED_HEAP */
   _RTEMS_Lock_allocator(); /*Lock allocator to ensure accuracy */
   _Heap_Get_information(
       &_Workspace_Area,
       &info); /*_Heap_Get_information is part of the RTEMS API */
   _RTEMS_Unlock_allocator();
-#endif /* RTEMS_PROTECTED_HEAP */
-#if (__RTEMS_MAJOR__ > 4) || (__RTEMS_MAJOR__ == 4 && __RTEMS_MINOR__ > 9)
+ #endif /* RTEMS_PROTECTED_HEAP */
+ #if (__RTEMS_MAJOR__ > 4) || (__RTEMS_MAJOR__ == 4 && __RTEMS_MINOR__ > 9)
   pval->numBytesTotal = Configuration.work_space_size;
-#else
+ #else
   pval->numBytesTotal = _Configuration_Table->work_space_size;
-#endif
+ #endif
+#endif /* _RTEMS_MAJOR__ >= 6 */
   pval->numBytesFree = info.Free.total;
   pval->numBytesAlloc = info.Used.total;
   return 0;