diff --git a/arch/arm/src/common/up_createstack.c b/arch/arm/src/common/up_createstack.c
index 12d4575e3dd..eb5986835f4 100644
--- a/arch/arm/src/common/up_createstack.c
+++ b/arch/arm/src/common/up_createstack.c
@@ -220,7 +220,7 @@ int up_create_stack(FAR struct tcb_s *tcb, size_t stack_size, uint8_t ttype)
   if (tcb->stack_alloc_ptr)
     {
 #if defined(CONFIG_TLS) && defined(CONFIG_STACK_COLORATION)
-      uinptr_t stack_base;
+      uintptr_t stack_base;
 #endif
       size_t top_of_stack;
       size_t size_of_stack;
@@ -264,7 +264,7 @@ int up_create_stack(FAR struct tcb_s *tcb, size_t stack_size, uint8_t ttype)
        * water marks.
        */
 
-      stackbase  = (uintptr_t)tcb->stack_alloc_ptr + sizeof(struct tls_info_s);
+      stack_base  = (uintptr_t)tcb->stack_alloc_ptr + sizeof(struct tls_info_s);
       stack_size = tcb->adj_stack_size - sizeof(struct tls_info_s);
       up_stack_color((FAR void *)stack_base, stack_size);
 
diff --git a/arch/arm/src/common/up_usestack.c b/arch/arm/src/common/up_usestack.c
index 5dea96be4e9..887387976ae 100644
--- a/arch/arm/src/common/up_usestack.c
+++ b/arch/arm/src/common/up_usestack.c
@@ -174,7 +174,13 @@ int up_use_stack(struct tcb_s *tcb, void *stack, size_t stack_size)
    * value that we can use later to test for high water marks.
    */
 
-#  warning Missing logic
+#ifdef CONFIG_TLS
+  up_stack_color(
+      (FAR void *)((uintptr_t)tcb->stack_alloc_ptr + sizeof(struct tls_info_s)),
+      tcb->adj_stack_size - sizeof(struct tls_info_s));
+#else
+  up_stack_color(tcb->stack_alloc_ptr, tcb->adj_stack_size);
+#endif
 #endif
 
   return OK;
diff --git a/configs/nucleo-l476rg/include/board.h b/configs/nucleo-l476rg/include/board.h
index cc132e838b0..0c3131abc39 100644
--- a/configs/nucleo-l476rg/include/board.h
+++ b/configs/nucleo-l476rg/include/board.h
@@ -109,15 +109,15 @@
  * but are normally-high GPIOs.
  */
 
-#define GPIO_I2C1_SCL    GPIO_I2C1_SCL_2
-#define GPIO_I2C1_SDA    GPIO_I2C1_SDA_2
+#define GPIO_I2C1_SCL    (GPIO_I2C1_SCL_2|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
+#define GPIO_I2C1_SDA    (GPIO_I2C1_SDA_2|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
 #define GPIO_I2C1_SCL_GPIO \
    (GPIO_OUTPUT|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTB|GPIO_PIN8)
 #define GPIO_I2C1_SDA_GPIO \
    (GPIO_OUTPUT|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTB|GPIO_PIN9)
 
-#define GPIO_I2C2_SCL    GPIO_I2C2_SCL_1
-#define GPIO_I2C2_SDA    GPIO_I2C2_SDA_1
+#define GPIO_I2C2_SCL    (GPIO_I2C2_SCL_1|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
+#define GPIO_I2C2_SDA    (GPIO_I2C2_SDA_1|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
 #define GPIO_I2C2_SCL_GPIO \
    (GPIO_OUTPUT|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTB|GPIO_PIN10)
 #define GPIO_I2C2_SDA_GPIO \
diff --git a/configs/nucleo-l476rg/src/nucleo-l476rg.h b/configs/nucleo-l476rg/src/nucleo-l476rg.h
index 7f1ef0feef7..d35d247349a 100644
--- a/configs/nucleo-l476rg/src/nucleo-l476rg.h
+++ b/configs/nucleo-l476rg/src/nucleo-l476rg.h
@@ -52,9 +52,19 @@
  ************************************************************************************/
 /* Configuration ********************************************************************/
 
+#define HAVE_PROC             1
 #define HAVE_RTC_DRIVER       1
 #define HAVE_MMCSD 1
 
+#if !defined(CONFIG_FS_PROCFS)
+#  undef HAVE_PROC
+#endif
+
+#if defined(HAVE_PROC) && defined(CONFIG_DISABLE_MOUNTPOINT)
+#  warning Mountpoints disabled.  No procfs support
+#  undef HAVE_PROC
+#endif
+
 /* Check if we can support the RTC driver */
 
 #if !defined(CONFIG_RTC) || !defined(CONFIG_RTC_DRIVER)
diff --git a/configs/nucleo-l476rg/src/stm32_appinit.c b/configs/nucleo-l476rg/src/stm32_appinit.c
index 1e1bad7d9e2..34c579dbb13 100644
--- a/configs/nucleo-l476rg/src/stm32_appinit.c
+++ b/configs/nucleo-l476rg/src/stm32_appinit.c
@@ -39,7 +39,11 @@
 
 #include <nuttx/config.h>
 
+#include <sys/types.h>
+#include <sys/mount.h>
 #include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
 #include <syslog.h>
 #include <errno.h>
 
@@ -118,6 +122,21 @@ int board_app_initialize(uintptr_t arg)
   cpuload_initialize_once();
 #endif
 
+#ifdef HAVE_PROC
+  /* mount the proc filesystem */
+
+  syslog(LOG_INFO, "Mounting procfs to /proc\n");
+
+  ret = mount(NULL, CONFIG_NSH_PROC_MOUNTPOINT, "procfs", 0, NULL);
+  if (ret < 0)
+    {
+      syslog(LOG_ERR,
+             "ERROR: Failed to mount the PROC filesystem: %d (%d)\n",
+             ret, errno);
+      return ret;
+    }
+#endif
+
 #ifdef HAVE_RTC_DRIVER
   /* Instantiate the STM32L4 lower-half RTC driver */
 
diff --git a/configs/stm32l476vg-disco/include/board.h b/configs/stm32l476vg-disco/include/board.h
index c3e1efd354c..c05f74a7e5d 100644
--- a/configs/stm32l476vg-disco/include/board.h
+++ b/configs/stm32l476vg-disco/include/board.h
@@ -115,8 +115,8 @@
  *
  */
 
-#define GPIO_I2C1_SCL    GPIO_I2C1_SCL_1
-#define GPIO_I2C1_SDA    GPIO_I2C1_SDA_1
+#define GPIO_I2C1_SCL    (GPIO_I2C1_SCL_1|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
+#define GPIO_I2C1_SDA    (GPIO_I2C1_SDA_1|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
 #define GPIO_I2C1_SCL_GPIO \
    (GPIO_OUTPUT|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTB|GPIO_PIN6)
 #define GPIO_I2C1_SDA_GPIO \
@@ -126,8 +126,8 @@
 
 #if 0
 
-#define GPIO_I2C2_SCL    GPIO_I2C2_SCL_1
-#define GPIO_I2C2_SDA    GPIO_I2C2_SDA_1
+#define GPIO_I2C2_SCL    (GPIO_I2C2_SCL_1|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
+#define GPIO_I2C2_SDA    (GPIO_I2C2_SDA_1|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET)
 #define GPIO_I2C2_SCL_GPIO \
    (GPIO_OUTPUT|GPIO_OPENDRAIN|GPIO_SPEED_50MHz|GPIO_OUTPUT_SET|GPIO_PORTB|GPIO_PIN10)
 #define GPIO_I2C2_SDA_GPIO \