1 files changed, 56 insertions, 0 deletions
diff --git a/roms/u-boot/board/google/gru/gru.c b/roms/u-boot/board/google/gru/gru.c
new file mode 100644
index 000000000..23080c179
--- /dev/null
+++ b/roms/u-boot/board/google/gru/gru.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2018 Google
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <init.h>
+
+#ifdef CONFIG_SPL_BUILD
+/* provided to defeat compiler optimisation in board_init_f() */
+void gru_dummy_function(int i)
+{
+}
+
+int board_early_init_f(void)
+{
+# ifdef CONFIG_TARGET_CHROMEBOOK_BOB
+	int sum, i;
+
+	/*
+	 * Add a delay and ensure that the compiler does not optimise this out.
+	 * This is needed since the power rails tail a while to turn on, and
+	 * we get garbage serial output otherwise.
+	 */
+	sum = 0;
+	for (i = 0; i < 150000; i++)
+		sum += i;
+	gru_dummy_function(sum);
+#endif /* CONFIG_TARGET_CHROMEBOOK_BOB */
+
+	return 0;
+}
+#endif
+
+#ifndef CONFIG_SPL_BUILD
+int board_early_init_r(void)
+{
+	struct udevice *clk;
+	int ret;
+
+	/*
+	 * This init is done in SPL, but when chain-loading U-Boot SPL will
+	 * have been skipped. Allow the clock driver to check if it needs
+	 * setting up.
+	 */
+	ret = uclass_get_device_by_driver(UCLASS_CLK,
+					  DM_DRIVER_GET(clk_rk3399), &clk);
+	if (ret) {
+		debug("%s: CLK init failed: %d\n", __func__, ret);
+		return ret;
+	}
+
+	return 0;
+}
+#endif