Updates for STM3210E-EVAL SRAM

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4579 42af7a65-404d-4744-a932-0658087f49c3

configs/stm3210e-eval/README.txt

@@ -16,6 +16,7 @@ Contents
   - LEDs
   - Temperature Sensor
   - RTC
+  - FSMC SRAM
   - STM3210E-EVAL-specific Configuration Options
   - Configurations
 
@@ -350,6 +351,21 @@ RTC
    overflow interrupt may be lost even if the STM32 is powered down only momentarily.
    Therefore hi-res solution is only useful in systems where the power is always on.
 
+FSMC SRAM
+=========
+
+The 8-Mbit SRAM is connected to the STM32 at PG10 which will be FSMC_NE3, Bank1
+SRAM3.  This memory will appear at address 0x68000000.
+
+The on-board SRAM can be configured by setting
+
+  CONFIG_STM32_FSMC=y                         : Enables the FSMC
+  CONFIG_STM32_FSMC_SRAM=y                    : Enable external SRAM support
+  CONFIG_HEAP2_BASE=0x68000000                : SRAM will be located at 0x680000000
+  CONFIG_HEAP2_END=(0x68000000+(1*1024*1024)) : The size of the SRAM is 1Mbyte
+  CONFIG_MM_REGIONS=2                         : There will be two memory regions
+                                              : in the heap
+
 STM3210E-EVAL-specific Configuration Options
 ============================================
 

configs/stm3210e-eval/include/board.h

@@ -144,6 +144,14 @@
 #  define SDIO_SDXFR_CLKDIV     (3 << SDIO_CLKCR_CLKDIV_SHIFT)
 #endif
 
+/* SRAM definitions *****************************************************************/
+/* The 8 Mbit SRAM is provided on the PT3 board using the FSMC_NE3 chip select. */
+
+/* This is the Bank1 SRAM3 address: */
+
+#define BOARD_SRAM_BASE    0x68000000     /* Bank2 SRAM3 base address */
+#define BOARD_SRAM_SIZE    (1*1024*1024)  /* 8-Mbit = 1-Mbyte */
+
 /* LED definitions ******************************************************************/
 
 /* The STM3210E-EVAL board has 4 LEDs that we will encode as: */

configs/stm3210e-eval/src/up_boot.c

@@ -2,8 +2,8 @@
  * configs/stm3210e-eval/src/up_boot.c
  * arch/arm/src/board/up_boot.c
  *
- *   Copyright (C) 2009 Gregory Nutt. All rights reserved.
- *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *   Copyright (C) 2009, 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -71,6 +71,12 @@
 
 void stm32_boardinitialize(void)
 {
+  /* If the FSMC and FSMC_SRAM are selected, then enable SRAM access */
+
+#if defined(CONFIG_STM32_FSMC) && defined(CONFIG_STM32_FSMC_SRAM)
+  stm32_selectsram();
+#endif
+
   /* Configure SPI chip selects if 1) SPI is not disabled, and 2) the weak function
    * stm32_spiinitialize() has been brought into the link.
    */