[coreboot-gerrit] Change in coreboot[master]: mb/google/dedede: Read DRAM population strap

[Karthik Ramasubramanian (Code Review)]

Karthik Ramasubramanian has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/39812 )

Change subject: mb/google/dedede: Read DRAM population strap
......................................................................

mb/google/dedede: Read DRAM population strap

Read DRAM population strap and pass that information to FSP for memory
initialization.

BUG=b:152275658
TEST=Build the mainboard.

Change-Id: I69583f35ffc219bae9ce06bd4ba9898ed0d4d21d
Signed-off-by: Karthikeyan Ramasubramanian 
---
M src/mainboard/google/dedede/romstage.c
M src/mainboard/google/dedede/variants/baseboard/include/baseboard/gpio.h
2 files changed, 7 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/12/39812/1

diff --git a/src/mainboard/google/dedede/romstage.c b/src/mainboard/google/dedede/romstage.c
index 9c220d4..ca81785 100644
--- a/src/mainboard/google/dedede/romstage.c
+++ b/src/mainboard/google/dedede/romstage.c
@@ -6,8 +6,10 @@
  */

#include <baseboard/variants.h>
+#include <gpio.h>
 #include <soc/meminit_jsl.h>
 #include <soc/romstage.h>
+#include <variant/gpio.h>

void mainboard_memory_init_params(FSPM_UPD *memupd)
 {
@@ -16,7 +18,7 @@
    	.read_type = READ_SPD_CBFS,
    	.spd_spec.spd_index = variant_memory_sku(),
    };
-	/* TODO: Read the resistor strap to get number of memory segments. */
-	bool half_populated = 0;
+	bool half_populated = gpio_get(GPIO_MEM_CH_SEL);
+
    memcfg_init(&memupd->FspmConfig, board_cfg, &spd_info, half_populated);
 }
diff --git a/src/mainboard/google/dedede/variants/baseboard/include/baseboard/gpio.h b/src/mainboard/google/dedede/variants/baseboard/include/baseboard/gpio.h
index dfb2cd1..fff0489 100644
--- a/src/mainboard/google/dedede/variants/baseboard/include/baseboard/gpio.h
+++ b/src/mainboard/google/dedede/variants/baseboard/include/baseboard/gpio.h
@@ -26,4 +26,7 @@
 #define GPIO_MEM_CONFIG_2	GPP_C4
 #define GPIO_MEM_CONFIG_3	GPP_C5

+/* Memory channel select strap - 0:fully-populated, 1:half-populated */
+#define GPIO_MEM_CH_SEL		GPP_S0
+
 #endif /* __BASEBOARD_GPIO_H__ */