arm: omap5: add U-Boot FIT signing and SPL image post-processing

Modify the SPL build procedure for AM57xx and DRA7xx high-security (HS)
device variants to create a secure u-boot_HS.img FIT blob that contains
U-Boot and DTB artifacts signed with a TI-specific process based on the
CONFIG_TI_SECURE_DEVICE config option and the externally-provided image
signing tool.

Also populate the corresponding FIT image post processing call to be
performed during SPL runtime.

Signed-off-by: Daniel Allred <d-allred@ti.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

arch/arm/cpu/armv7/omap5/config.mk

@@ -15,5 +15,8 @@ else
 ALL-y	+= MLO
 endif
 else
+ifeq ($(CONFIG_TI_SECURE_DEVICE),y)
+ALL-y   += u-boot_HS.img
+endif
 ALL-y	+= u-boot.img
 endif

board/ti/am57xx/board.c

@@ -13,6 +13,7 @@
 #include <sata.h>
 #include <usb.h>
 #include <asm/omap_common.h>
+#include <asm/omap_sec_common.h>
 #include <asm/emif.h>
 #include <asm/gpio.h>
 #include <asm/arch/gpio.h>
@@ -750,3 +751,10 @@ int board_fit_config_name_match(const char *name)
 		return -1;
 }
 #endif
+
+#ifdef CONFIG_TI_SECURE_DEVICE
+void board_fit_image_post_process(void **p_image, size_t *p_size)
+{
+	secure_boot_verify_image(p_image, p_size);
+}
+#endif

board/ti/dra7xx/evm.c

@@ -17,6 +17,8 @@
 #include <asm/gpio.h>
 #include <usb.h>
 #include <linux/usb/gadget.h>
+#include <asm/omap_common.h>
+#include <asm/omap_sec_common.h>
 #include <asm/arch/gpio.h>
 #include <asm/arch/dra7xx_iodelay.h>
 #include <asm/emif.h>
@@ -834,3 +836,10 @@ int board_fit_config_name_match(const char *name)
 		return -1;
 }
 #endif
+
+#ifdef CONFIG_TI_SECURE_DEVICE
+void board_fit_image_post_process(void **p_image, size_t *p_size)
+{
+	secure_boot_verify_image(p_image, p_size);
+}
+#endif

configs/am57xx_hs_evm_defconfig

@@ -40,4 +40,5 @@ CONFIG_USB_XHCI_DWC3=y
 CONFIG_FIT=y
 CONFIG_SPL_OF_LIBFDT=y
 CONFIG_SPL_LOAD_FIT=y
+CONFIG_SPL_FIT_IMAGE_POST_PROCESS=y
 CONFIG_OF_LIST="am57xx-beagle-x15"

configs/dra7xx_hs_evm_defconfig

@@ -58,4 +58,5 @@ CONFIG_G_DNL_PRODUCT_NUM=0xd022
 CONFIG_FIT=y
 CONFIG_SPL_OF_LIBFDT=y
 CONFIG_SPL_LOAD_FIT=y
+CONFIG_SPL_FIT_IMAGE_POST_PROCESS=y
 CONFIG_OF_LIST="dra7-evm dra72-evm"