[U-Boot] [PATCH] ARM: am3517_evm: Add spl_start_uboot for Falcon Mode

[Adam Ford]

When booting the am3517-evm, the following message appears:
SPL: Please implement spl_start_uboot() for your board
SPL: Direct Linux boot not active!

This patch implements spl_start_uboot to clear this message
and allow device to know if it should boot U-Boot or kernel.

Fixes: 1c6b6f383a41 ("ARM: am3517_evm: Enable Falcon Mode")

Signed-off-by: Adam Ford <aford173 at gmail.com>

diff --git a/board/logicpd/am3517evm/am3517evm.c b/board/logicpd/am3517evm/am3517evm.c
index 6f728398c3..10031a4801 100644
--- a/board/logicpd/am3517evm/am3517evm.c
+++ b/board/logicpd/am3517evm/am3517evm.c
@@ -37,6 +37,15 @@ DECLARE_GLOBAL_DATA_PTR;
 #define CPGMACSS_SW_RST		(1 << 1)
 #define PHY_GPIO		30
 
+#if defined(CONFIG_SPL_BUILD)
+#if defined(CONFIG_SPL_OS_BOOT)
+int spl_start_uboot(void)
+{
+	/* break into full u-boot on 'c' */
+	return serial_tstc() && serial_getc() == 'c';
+}
+#endif
+#endif
 
 /*
  * Routine: board_init
-- 
2.17.1