Updates for STM3210E-EVAL SRAM

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

1 files changed, 16 insertions, 0 deletions

diff --git a/nuttx/configs/stm3210e-eval/README.txt b/nuttx/configs/stm3210e-eval/README.txt
index 08d5b572b..c356a17d5 100755
--- a/nuttx/configs/stm3210e-eval/README.txt
+++ b/nuttx/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
 ============================================