spl: build: ti: add support for secure boot images

Updates the SPL build so that when CONFIG_TI_SECURE_DEVICE
is in use (which it should be when building for secure parts),
the TI secure development package is used to create a valid
secure boot image. The u-boot SPL build processes is NOT aware
of the details of creating the boot image - all of that information
is encapsulated in the TI secure development package, which is
available from TI. More info can be found in README.ti-secure

Right now, two image types are generated, MLO and X-LOADER. The types
are important, as certain boot modes implemented by the device's ROM
boot loader require one or the other (they are not equivalent). The
output filenames are u-boot-spl_HS_MLO and u-boot-spl_HS_X-LOADER. The
u-boot-spl_HS_MLO image is also copied to a file named MLO, which is
the name that the device ROM bootloader requires for loading from the
FAT partition of an SD card (same as on non-secure devices).

Signed-off-by: Daniel Allred <d-allred@ti.com>
Signed-off-by: Madan Srinivas <madans@ti.com>
Reviewed-by: Lokesh Vutla <lokeshvutla@ti.com>
Tested-by: Andreas Dannenberg <dannenberg@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>

diff --git a/arch/arm/cpu/armv7/omap5/config.mk b/arch/arm/cpu/armv7/omap5/config.mk
index ef2725a..a7e55a5 100644 (file)
--- a/arch/arm/cpu/armv7/omap5/config.mk
+++ b/arch/arm/cpu/armv7/omap5/config.mk
@@ -6,8 +6,14 @@
 # SPDX-License-Identifier:     GPL-2.0+
 #
 
+include  $(srctree)/$(CPUDIR)/omap-common/config_secure.mk
+
 ifdef CONFIG_SPL_BUILD
+ifeq ($(CONFIG_TI_SECURE_DEVICE),y)
+ALL-y  += u-boot-spl_HS_MLO u-boot-spl_HS_X-LOADER
+else
 ALL-y  += MLO
+endif
 else
 ALL-y  += u-boot.img
 endif