SAMV71-XULT: Add support for SDRAM (unverified)

arch/arm/src/common/up_udelay.c

@@ -100,6 +100,7 @@ void up_udelay(useconds_t microseconds)
       for (i = 0; i < CONFIG_BOARD_LOOPSPERMSEC; i++)
         {
         }
+
       microseconds -= 1000;
     }
 
@@ -108,6 +109,7 @@ void up_udelay(useconds_t microseconds)
       for (i = 0; i < CONFIG_BOARD_LOOPSPER100USEC; i++)
         {
         }
+
       microseconds -= 100;
     }
 
@@ -116,6 +118,7 @@ void up_udelay(useconds_t microseconds)
       for (i = 0; i < CONFIG_BOARD_LOOPSPER10USEC; i++)
         {
         }
+
       microseconds -= 10;
     }
 
@@ -124,6 +127,7 @@ void up_udelay(useconds_t microseconds)
       for (i = 0; i < CONFIG_BOARD_LOOPSPERUSEC; i++)
         {
         }
+
       microseconds--;
     }
 }

arch/arm/src/samv7/chip/sam_sdramc.h

@@ -42,7 +42,7 @@
  ****************************************************************************************/
 
 #include <nuttx/config.h>
-#include <arch/armv7/chip.h>
+#include <arch/samv7/chip.h>
 
 #include "chip/sam_memorymap.h"
 

arch/arm/src/samv7/chip/sam_wdt.h

@@ -42,7 +42,7 @@
  ****************************************************************************************/
 
 #include <nuttx/config.h>
-#include <arch/armv7/chip.h>
+#include <arch/samv7/chip.h>
 
 #include "chip/sam_memorymap.h"
 

arch/arm/src/samv7/chip/samv71_pinmap.h

@@ -333,7 +333,7 @@
 #define GPIO_SDRAMC_RAS      (GPIO_PERIPHC | GPIO_CFG_DEFAULT | GPIO_PORT_PIOD | GPIO_PIN16)
 #define GPIO_SDRAMC_WE       (GPIO_PERIPHC | GPIO_CFG_DEFAULT | GPIO_PORT_PIOD | GPIO_PIN29)
 
-/* Static Memory Controller (SMC) */
+/* Static Memory Controller (SMC).  Many pins shared with SDRAMC */
 
 #define GPIO_SMC_A0          (GPIO_PERIPHA | GPIO_CFG_PULLUP | GPIO_PORT_PIOC | GPIO_PIN18)
 #define GPIO_SMC_A1          (GPIO_PERIPHA | GPIO_CFG_PULLUP | GPIO_PORT_PIOC | GPIO_PIN19)