crossystem: Add the ddr_type field on crossystem for querying DDR RAM type

Samsung want to know what memory type on the device. So this CL adds a
new field ddr_type to crossystem utility in order to query this info.

It is only available on ARM platform so far.

BUG=chrome-os-partner:10857
TEST=Built and boot on Snow successfuly. On userspace, query the field via:
localhost ~ # crossystem ddr_type
ddr3

Change-Id: I01d1dec412fe4052e1ea6cfe2e53830da97a710b
Signed-off-by: Tom Wai-Hong Tam <waihong@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/26411
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Reviewed-by: Simon Glass <sjg@chromium.org>

2 files changed, 6 insertions, 0 deletions

diff --git a/host/arch/arm/lib/crossystem_arch.c b/host/arch/arm/lib/crossystem_arch.c
index a4d08af7..7895badb 100644
--- a/host/arch/arm/lib/crossystem_arch.c
+++ b/host/arch/arm/lib/crossystem_arch.c
@@ -379,6 +379,8 @@ const char* VbGetArchPropertyString(const char* name, char* dest, int size) {
     prop = "firmware-type";
   else if (!strcasecmp(name, "ecfw_act"))
     prop = "active-ec-firmware";
+  else if (!strcasecmp(name, "ddr_type"))
+    prop = "ddr-type";
 
   if (prop)
     str = ReadFdtString(prop);
diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c
index 80a3d3c2..1515ecf3 100644
--- a/host/lib/crossystem.c
+++ b/host/lib/crossystem.c
@@ -404,6 +404,8 @@ int VbGetSystemPropertyInt(const char* name) {
 
 
 const char* VbGetSystemPropertyString(const char* name, char* dest, int size) {
+  static const char unknown_string[] = "unknown";
+
   /* Check architecture-dependent properties first */
   if (VbGetArchPropertyString(name, dest, size))
     return dest;
@@ -425,6 +427,8 @@ const char* VbGetSystemPropertyString(const char* name, char* dest, int size) {
     return GetVdatString(dest, size, VDAT_STRING_LOAD_FIRMWARE_DEBUG);
   } else if (!strcasecmp(name, "vdat_lkdebug")) {
     return GetVdatString(dest, size, VDAT_STRING_LOAD_KERNEL_DEBUG);
+  } else if (!strcasecmp(name, "ddr_type")) {
+    return unknown_string;
   }
 
   return NULL;