1 files changed, 57 insertions, 0 deletions
diff --git a/src/mainboard/google/brya/bootblock.c b/src/mainboard/google/brya/bootblock.c
index 1815615f5e..6576469c9c 100644
--- a/src/mainboard/google/brya/bootblock.c
+++ b/src/mainboard/google/brya/bootblock.c
@@ -2,6 +2,57 @@
 
 #include <baseboard/variants.h>
 #include <bootblock_common.h>
+#include <console/console.h>
+#include <intelblocks/mp_init.h>
+#include <fmap.h>
+#include <commonlib/region.h>
+#include <console/console.h>
+#include <intelblocks/pmclib.h>
+#include <cf9_reset.h>
+
+#define SI_DESC_REGION		"SI_DESC"
+#define SI_DESC_REGION_SZ	4096
+#define PMC_DESC_7_BYTE3	0xc32
+
+/* It updates PMC Descriptor in the Descriptor Region */
+static void configure_pmc_descriptor(void)
+{
+	uint8_t si_desc_buf[SI_DESC_REGION_SZ];
+	struct region_device desc_rdev;
+
+	if (fmap_locate_area_as_rdev_rw(SI_DESC_REGION, &desc_rdev) < 0) {
+		printk(BIOS_ERR, "Failed to locate %s in the FMAP\n", SI_DESC_REGION);
+		return;
+	}
+
+	if (rdev_readat(&desc_rdev, si_desc_buf, 0, SI_DESC_REGION_SZ) != SI_DESC_REGION_SZ) {
+		printk(BIOS_ERR, "Failed to read Descriptor Region from SPI Flash\n");
+		return;
+	}
+
+	if (si_desc_buf[PMC_DESC_7_BYTE3] == 0x40) {
+		si_desc_buf[PMC_DESC_7_BYTE3] = 0x44;
+
+		if (rdev_eraseat(&desc_rdev, 0, SI_DESC_REGION_SZ) != SI_DESC_REGION_SZ) {
+			printk(BIOS_ERR, "Failed to erase Descriptor Region area\n");
+			return;
+		}
+
+		if (rdev_writeat(&desc_rdev, si_desc_buf, 0, SI_DESC_REGION_SZ)
+				!= SI_DESC_REGION_SZ) {
+			printk(BIOS_ERR, "Failed to update Descriptor Region\n");
+			return;
+		}
+
+		printk(BIOS_DEBUG, "Update of PMC Descriptor successful, trigger GLOBAL RESET\n");
+
+		pmc_global_reset_enable(1);
+		do_full_reset();
+		die("Failed to trigger GLOBAL RESET\n");
+	}
+
+	printk(BIOS_DEBUG, "Update of PMC Descriptor is not required!\n");
+}
 
 void bootblock_mainboard_early_init(void)
 {
@@ -10,3 +61,9 @@ void bootblock_mainboard_early_init(void)
 	pads = variant_early_gpio_table(&num);
 	gpio_configure_pads(pads, num);
 }
+
+void bootblock_mainboard_init(void)
+{
+	if (cpu_get_cpuid() == CPUID_ALDERLAKE_A0)
+		configure_pmc_descriptor();
+}