diff --git a/arch/arm/src/lpc54xx/chip/lpc54_syscon.h b/arch/arm/src/lpc54xx/chip/lpc54_syscon.h
index 7365cd1fb6a..0893f72131c 100644
--- a/arch/arm/src/lpc54xx/chip/lpc54_syscon.h
+++ b/arch/arm/src/lpc54xx/chip/lpc54_syscon.h
@@ -617,9 +617,9 @@
 
 /* EMC clock divider */
 
-#define SYSCON_EMCCLKDIV_DIV_SHIFT             (9)       /* Bits 0-7: Clock divider value */
+#define SYSCON_EMCCLKDIV_DIV_SHIFT             (0)       /* Bits 0-7: Clock divider value */
 #define SYSCON_EMCCLKDIV_DIV_MASK              (0xff <<SYSCON_EMCCLKDIV_DIV_SHIFT)
-#  define SYSCON_EMCCLKDIV_DIV(n)              ((uint32_t)((n)-1) <<SYSCON_EMCCLKDIV_DIV_SHIFT)
+#  define SYSCON_EMCCLKDIV_DIV(n)              ((uint32_t)((n)-1) << SYSCON_EMCCLKDIV_DIV_SHIFT)
 #define SYSCON_EMCCLKDIV_RESET                 (1 << 29) /* Bit 29: Resets the divider counter */
 #define SYSCON_EMCCLKDIV_ HALT                 (1 << 30) /* Bit 30: Halts the divider counter */
 #define SYSCON_EMCCLKDIV_REQFLAG               (1 << 31) /* Bit 31: Divider status flag */
diff --git a/configs/lpcxpresso-lpc54628/README.txt b/configs/lpcxpresso-lpc54628/README.txt
index 15537d96bf3..d60488020d1 100644
--- a/configs/lpcxpresso-lpc54628/README.txt
+++ b/configs/lpcxpresso-lpc54628/README.txt
@@ -30,35 +30,10 @@ STATUS
   2017-12-10:  The basic NSH configuration is functional at 220MHz with a
     Serial console, timer and LED support.  Added support for the external
     SDRAM and for the RAM test utility -- UNTESTED!
-  2017-12-11:  Fixed an error in board LEDs.  SDRAM is marginally functional:
-
-      nsh> mw a0000000=55555555
-      a0000000 = 0x00000000 -> 0x55555555
-      nsh> mw a0000000
-      a0000000 = 0x55555555
-
-    But does not pass the ramtest.  These tests all pass:
-
-      nsh> ramtest a0000000 16
-      nsh> ramtest a0000000 32
-      nsh> ramtest a0000000 64
-      nsh> ramtest a0000000 126
-
-    But this fails the marching one's test (only):
-
-      nsh> ramtest a0000000 128
-      RAMTest: Marching ones: a0000000 128
-      RAMTest: ERROR: Address a0000006 Found: 0002 Expected 0001
-      RAMTest: ERROR: Address a0000008 Found: 0002 Expected 0001
-      ...
-      RAMTest: ERROR: Address a000007e Found: d47e Expected 0001
-      RAMTest: Marching zeroes: a0000000 128
-      RAMTest: Pattern test: a0000000 128 55555555 aaaaaaaa
-      RAMTest: Pattern test: a0000000 128 66666666 99999999
-      RAMTest: Pattern test: a0000000 128 33333333 cccccccc
-      RAMTest: Address-in-address test: a0000000 128
-
-    Additional test fail as the size of the test increases.
+  2017-12-11:  Fixed an error in board LEDs.  SDRAM is partially functional
+    but not reliable.  Added framework for future I2C and SPI flexcomm
+    drivers (mostly empty files for now)
+  2017-12-12:  The SDRAM is now functional passes the commplete RAM test.
 
 Configurations
 ==============
@@ -156,4 +131,13 @@ Configurations
        0xa0000000, the size of the memory is 128Mbits or 16Mb.  So the DRAM
        may be tested with this command:
 
+         NuttShell (NSH) NuttX-7.23
          nsh> ramtest a0000000 16777216
+         RAMTest: Marching ones: a0000000 16777216
+         RAMTest: Marching zeroes: a0000000 16777216
+         RAMTest: Pattern test: a0000000 16777216 55555555 aaaaaaaa
+         RAMTest: Pattern test: a0000000 16777216 66666666 99999999
+         RAMTest: Pattern test: a0000000 16777216 33333333 cccccccc
+         RAMTest: Address-in-address test: a0000000 16777216
+         nsh>
+
diff --git a/configs/lpcxpresso-lpc54628/src/lpc54_sdram.c b/configs/lpcxpresso-lpc54628/src/lpc54_sdram.c
index 8a64b55e0c1..febfbec82f9 100644
--- a/configs/lpcxpresso-lpc54628/src/lpc54_sdram.c
+++ b/configs/lpcxpresso-lpc54628/src/lpc54_sdram.c
@@ -111,7 +111,7 @@ static const struct emc_dynamic_timing_config_s g_emc_dynconfig =
   .rc       = 60,
   .rfc      = 60,
   .xsr      = 67,
-  .rrd      = 23,
+  .rrd      = 12,
   .mrd      = 2,
 };