[U-Boot] [PATCH 6/7] enable chain of trust for PowerPC platforms

[Aneesh Bansal]

Chain of Trust is enabled for PowerPC platforms
for Secure Boot. CONFIG_BOARD_LATE_INIT is defined.
In board_late_init(), fsl_setenv_chain_of_trust() is called which
will perform the following:
- If boot mode is non-secure, return (No Change)
- If boot mode is secure, set the following environmet variables:
   bootdelay = 0 (To disable Boot Prompt)
   bootcmd = CONFIG_CHAIN_BOOT_CMD (Validate and execute Boot script)

Signed-off-by: Aneesh Bansal <aneesh.bansal at freescale.com>
---
 arch/powerpc/cpu/mpc85xx/cpu_init.c        | 12 ++++++++++++
 arch/powerpc/include/asm/fsl_secure_boot.h |  7 +++++++
 2 files changed, 19 insertions(+)

diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c b/arch/powerpc/cpu/mpc85xx/cpu_init.c
index 13a7d0f..a02f6f5 100644
--- a/arch/powerpc/cpu/mpc85xx/cpu_init.c
+++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c
@@ -26,6 +26,7 @@
 #include <fsl_usb.h>
 #include <hwconfig.h>
 #include <linux/compiler.h>
+#include <fsl_validate.h>
 #include "mp.h"
 #ifdef CONFIG_FSL_CAAM
 #include <fsl_sec.h>
@@ -1009,3 +1010,14 @@ void cpu_secondary_init_r(void)
 	qe_reset();
 #endif
 }
+
+#ifdef CONFIG_BOARD_LATE_INIT
+int board_late_init(void)
+{
+#ifdef CONFIG_CHAIN_OF_TRUST
+	fsl_setenv_chain_of_trust();
+#endif
+
+	return 0;
+}
+#endif
diff --git a/arch/powerpc/include/asm/fsl_secure_boot.h b/arch/powerpc/include/asm/fsl_secure_boot.h
index b29246a..a4ea15c 100644
--- a/arch/powerpc/include/asm/fsl_secure_boot.h
+++ b/arch/powerpc/include/asm/fsl_secure_boot.h
@@ -13,6 +13,13 @@
 #define CONFIG_CHAIN_OF_TRUST
 #endif
 
+/* fsl_setenv_chain_of_trust() must be called from
+ * board_late_init()
+ */
+#ifndef CONFIG_BOARD_LATE_INIT
+#define CONFIG_BOARD_LATE_INIT
+#endif
+
 #if defined(CONFIG_FSL_CORENET)
 #define CONFIG_SYS_PBI_FLASH_BASE		0xc0000000
 #elif defined(CONFIG_BSC9132QDS)
-- 
1.8.1.4