diff --git a/src/mainboard/google/purin/Kconfig b/src/mainboard/google/purin/Kconfig
index b9d73f0331..0d1965f9dc 100644
--- a/src/mainboard/google/purin/Kconfig
+++ b/src/mainboard/google/purin/Kconfig
@@ -45,16 +45,12 @@ config MAINBOARD_VENDOR
 	string
 	default "Google"
 
-config VBOOT_RAMSTAGE_INDEX
-	hex
-	default 0x3
-
 config BOOT_MEDIA_SPI_BUS
 	int
 	default 0
 
 config DRAM_SIZE_MB
 	int
-	default 1024
+	default 256
 
 endif #  BOARD_GOOGLE_PURIN
diff --git a/src/mainboard/google/purin/mainboard.c b/src/mainboard/google/purin/mainboard.c
index 319cb29273..52f86d8263 100644
--- a/src/mainboard/google/purin/mainboard.c
+++ b/src/mainboard/google/purin/mainboard.c
@@ -19,6 +19,7 @@
 
 #include <device/device.h>
 #include <boot/coreboot_tables.h>
+#include <symbols.h>
 
 static void mainboard_init(device_t dev)
 {
@@ -35,4 +36,11 @@ struct chip_operations mainboard_ops = {
 
 void lb_board(struct lb_header *header)
 {
+	struct lb_range *dma;
+
+	dma = (struct lb_range *)lb_new_record(header);
+	dma->tag = LB_TAB_DMA;
+	dma->size = sizeof(*dma);
+	dma->range_start = (uintptr_t)_dma_coherent;
+	dma->range_size = _dma_coherent_size;
 }
diff --git a/src/soc/broadcom/cygnus/Makefile.inc b/src/soc/broadcom/cygnus/Makefile.inc
index 6f0c584394..cac9062f76 100644
--- a/src/soc/broadcom/cygnus/Makefile.inc
+++ b/src/soc/broadcom/cygnus/Makefile.inc
@@ -47,6 +47,8 @@ romstage-y += timer.c
 
 ramstage-y += cbmem.c
 ramstage-y += i2c.c
+ramstage-y += sdram.c
+ramstage-y += soc.c
 ramstage-y += timer.c
 ramstage-$(CONFIG_SPI_FLASH) += spi.c
 ramstage-$(CONFIG_DRIVERS_UART) += ns16550.c
diff --git a/src/soc/broadcom/cygnus/include/soc/memlayout.ld b/src/soc/broadcom/cygnus/include/soc/memlayout.ld
index 542174bf02..6342810929 100644
--- a/src/soc/broadcom/cygnus/include/soc/memlayout.ld
+++ b/src/soc/broadcom/cygnus/include/soc/memlayout.ld
@@ -42,4 +42,5 @@ SECTIONS
 	DRAM_START(0x60000000)
 	RAMSTAGE(0x60000000, 128K)
 	POSTRAM_CBFS_CACHE(0x60100000, 1M)
+	DMA_COHERENT(0x60200000, 2M)
 }
diff --git a/src/soc/broadcom/cygnus/include/soc/sdram.h b/src/soc/broadcom/cygnus/include/soc/sdram.h
index 673d3d4f40..c7d6383e58 100644
--- a/src/soc/broadcom/cygnus/include/soc/sdram.h
+++ b/src/soc/broadcom/cygnus/include/soc/sdram.h
@@ -20,7 +20,10 @@
 #ifndef __SOC_BROADCOM_CYGNUS_SDRAM_H__
 #define __SOC_BROADCOM_CYGNUS_SDRAM_H__
 
+#include <stdint.h>
+
 void ddr_init2(void);
 void sdram_init(void);
+uint32_t sdram_size_mb(void);
 
 #endif	/* __SOC_BROADCOM_CYGNUS_SDRAM_H__ */
diff --git a/src/soc/broadcom/cygnus/romstage.c b/src/soc/broadcom/cygnus/romstage.c
index e581a63356..f293f31d2a 100644
--- a/src/soc/broadcom/cygnus/romstage.c
+++ b/src/soc/broadcom/cygnus/romstage.c
@@ -55,9 +55,11 @@ void main(void)
 	after_dram_time = timestamp_get();
 #endif
 
-	mmu_init();
-	mmu_config_range(0, 4096, DCACHE_OFF);
-	dcache_mmu_enable();
+	/* Now that DRAM is up, add mappings for it and DMA coherency buffer. */
+	mmu_config_range((uintptr_t)_dram/MiB,
+			 sdram_size_mb(), DCACHE_WRITEBACK);
+	mmu_config_range((uintptr_t)_dma_coherent/MiB,
+			 _dma_coherent_size/MiB, DCACHE_OFF);
 
 	cbmem_initialize_empty();
 
diff --git a/src/soc/broadcom/cygnus/sdram.c b/src/soc/broadcom/cygnus/sdram.c
index 1642842e0c..bab126d66c 100644
--- a/src/soc/broadcom/cygnus/sdram.c
+++ b/src/soc/broadcom/cygnus/sdram.c
@@ -60,3 +60,8 @@ void sdram_init(void)
 
 	test_ddr();
 }
+
+uint32_t sdram_size_mb(void)
+{
+	return CONFIG_DRAM_SIZE_MB;
+}
diff --git a/src/soc/broadcom/cygnus/soc.c b/src/soc/broadcom/cygnus/soc.c
new file mode 100644
index 0000000000..c9597f2b08
--- /dev/null
+++ b/src/soc/broadcom/cygnus/soc.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2015 Google Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <device/device.h>
+#include <soc/sdram.h>
+#include <stddef.h>
+#include <stdlib.h>
+#include <symbols.h>
+
+static void soc_init(device_t dev)
+{
+	ram_resource(dev, 0, (uintptr_t)_dram/KiB, sdram_size_mb()*(MiB/KiB));
+}
+
+static void soc_noop(device_t dev)
+{
+}
+
+static struct device_operations soc_ops = {
+	.read_resources   = soc_noop,
+	.set_resources    = soc_noop,
+	.enable_resources = soc_noop,
+	.init             = soc_init,
+	.scan_bus         = 0,
+};
+
+static void enable_cygnus_dev(device_t dev)
+{
+	dev->ops = &soc_ops;
+}
+
+struct chip_operations soc_broadcom_cygnus_ops = {
+	CHIP_NAME("SOC Broadcom Cygnus")
+	.enable_dev = enable_cygnus_dev,
+};