Change in coreboot[master]: mb/purism/librem_cnl: Implement `die_notify`

[Angel Pons (Code Review)]

Angel Pons has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/50013 )

Change subject: mb/purism/librem_cnl: Implement `die_notify`
......................................................................

mb/purism/librem_cnl: Implement `die_notify`

Make the SATA LED blink when coreboot dies. GPIO functions aren't
compiled in for postcar, so add a check to prevent linker failures.

TEST: Try to boot Librem Mini WHL without RAM, observe blinking (and
      also blinding LED). Re-install RAM (and re-seat RAM a few times),
      boot to OS, and observe SATA LED operating normally, as expected.

Change-Id: I0ffac0ab02e52e9fbba7990f401d87e50a1b5154
Signed-off-by: Angel Pons 
---
M src/mainboard/purism/librem_cnl/Makefile.inc
A src/mainboard/purism/librem_cnl/variants/librem_mini/die.c
2 files changed, 24 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/13/50013/1

diff --git a/src/mainboard/purism/librem_cnl/Makefile.inc b/src/mainboard/purism/librem_cnl/Makefile.inc
index 8e3b5a6..b4d7fd7 100644
--- a/src/mainboard/purism/librem_cnl/Makefile.inc
+++ b/src/mainboard/purism/librem_cnl/Makefile.inc
@@ -7,3 +7,5 @@
 ramstage-y += ramstage.c

CPPFLAGS_common += -I$(src)/mainboard/$(MAINBOARDDIR)/variants/$(VARIANT_DIR)/include
+
+all-y += variants/$(VARIANT_DIR)/die.c
diff --git a/src/mainboard/purism/librem_cnl/variants/librem_mini/die.c b/src/mainboard/purism/librem_cnl/variants/librem_mini/die.c
new file mode 100644
index 0000000..8147abb
--- /dev/null
+++ b/src/mainboard/purism/librem_cnl/variants/librem_mini/die.c
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <console/console.h>
+#include <delay.h>
+#include <gpio.h>
+#include <soc/gpio.h>
+
+void die_notify(void)
+{
+	if (ENV_POSTCAR)
+		return;
+
+	/* Make SATA LED blink */
+	gpio_output(GPP_E8, 1);
+
+	while (1) {
+		gpio_set(GPP_E8, 0);
+		mdelay(100);
+		gpio_set(GPP_E8, 1);
+		mdelay(100);
+	}
+}