diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index f1391c2..9bb221c 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -37,6 +37,14 @@ config MFD_SM501_GPIO
 	 lines on the SM501. The platform data is used to supply the
 	 base number for the first GPIO line to register.
 
+config SM501_USE_EXTERNAL_MEMORY
+	bool "Support SM501 External memory"
+	depends on MFD_SM501
+	default y if DEXXON_GDIUM
+	 ---help---
+	  This is the core driver for the Silicon Motion SM501 multimedia
+	  companion chip. This option will support SM501 External memory.
+
 config MFD_ASIC3
 	bool "Support for Compaq ASIC3"
 	depends on GENERIC_HARDIRQS && GPIOLIB && ARM
diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index 7242f3a..3924864 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1343,6 +1343,16 @@ static int sm501_check_clocks(struct sm501_devdata *sm)
 	return ((msrc == 0 && m1src != 0) || (msrc != 0 && m1src == 0));
 }
 
+#ifdef CONFIG_SM501_USE_EXTERNAL_MEMORY
+static unsigned int sm501_mem_external[] = {
+	[0]	= 2*1024*1024,
+	[1]	= 4*1024*1024,
+	[4]	= 64*1024*1024,
+	[5]	= 32*1024*1024,
+	[6]	= 16*1024*1024,
+	[7]	= 8*1024*1024,
+};
+#else
 static unsigned int sm501_mem_local[] = {
 	[0]	= 4*1024*1024,
 	[1]	= 8*1024*1024,
@@ -1351,6 +1361,8 @@ static unsigned int sm501_mem_local[] = {
 	[4]	= 64*1024*1024,
 	[5]	= 2*1024*1024,
 };
+#endif
+
 
 /* sm501_init_dev
  *
@@ -1382,7 +1394,18 @@ static int __devinit sm501_init_dev(struct sm501_devdata *sm)
 	smc501_writel(0, sm->regs + SM501_IRQ_MASK);
 
 	dramctrl = smc501_readl(sm->regs + SM501_DRAM_CONTROL);
+#ifdef CONFIG_SM501_USE_EXTERNAL_MEMORY
+#if CONFIG_GDIUM_VERSION < 3
+	/* first generations of gdium did not configure correctly the dram control
+	   register */
+	dramctrl &= ~((7 << 24) | (7 << 13) | (3 << 22) | (3 << 11));
+	dramctrl |=  ((5 << 24) | (3 << 13) | (2 << 22) | (2 << 11));
+	smc501_writel( dramctrl, sm->regs + SM501_DRAM_CONTROL);
+#endif
+	mem_avail = sm501_mem_external[(dramctrl >> 24) & 0x7];
+#else
 	mem_avail = sm501_mem_local[(dramctrl >> 13) & 0x7];
+#endif
 
 	dev_info(sm->dev, "SM501 At %p: Version %08lx, %ld Mb, IRQ %d\n",
 		 sm->regs, devid, (unsigned long)mem_avail >> 20, sm->irq);