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-rw-r--r--src/mainboard/google/rambi/romstage.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/src/mainboard/google/rambi/romstage.c b/src/mainboard/google/rambi/romstage.c
index d15a21dc2d..369ebad445 100644
--- a/src/mainboard/google/rambi/romstage.c
+++ b/src/mainboard/google/rambi/romstage.c
@@ -37,14 +37,29 @@
#define GPIO_SSUS_38_PAD 50
#define GPIO_SSUS_39_PAD 58
+static inline void disable_internal_pull(int pad)
+{
+ const int pull_mask = ~(0xf << 7);
+ write32(ssus_pconf0(pad), read32(ssus_pconf0(pad)) & pull_mask);
+}
+
static void *get_spd_pointer(char *spd_file_content, int total_spds)
{
int ram_id = 0;
+ /* The ram_id[2:0] pullups on rambi are too large for the default 20K
+ * pulldown on the pad. Therefore, disable the internal pull resistor to
+ * read high values correctly. */
+ disable_internal_pull(GPIO_SSUS_37_PAD);
+ disable_internal_pull(GPIO_SSUS_38_PAD);
+ disable_internal_pull(GPIO_SSUS_39_PAD);
+
ram_id |= (ssus_get_gpio(GPIO_SSUS_37_PAD) << 0);
ram_id |= (ssus_get_gpio(GPIO_SSUS_38_PAD) << 1);
ram_id |= (ssus_get_gpio(GPIO_SSUS_39_PAD) << 2);
+ printk(BIOS_DEBUG, "ram_id=%d, total_spds: %d\n", ram_id, total_spds);
+
if (ram_id >= total_spds)
return NULL;