arm64: ls1043ardb: Add distro secure boot support

Enable validation of boot.scr script prior to its execution dependent
on "secureboot" flag in environment. Disable fall back option to
nor/qspi boot in case of secure boot. Also enable "secureboot=y"
flag in environment for ARM based platforms instead of bootcmd.

Signed-off-by: Sumit Garg <sumit.garg@nxp.com>
Tested-by: Vinitha Pillai <vinitha.pillai@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>

board/freescale/common/fsl_chain_of_trust.c

@@ -81,7 +81,13 @@ int fsl_setenv_chain_of_trust(void)
 	 * bootcmd = CONFIG_CHAIN_BOOT_CMD (Validate and execute Boot script)
 	 */
 	setenv("bootdelay", "0");
+
+#ifdef CONFIG_ARM
+	setenv("secureboot", "y");
+#else
 	setenv("bootcmd", CONFIG_CHAIN_BOOT_CMD);
+#endif
+
 	return 0;
 }
 #endif

configs/ls1043ardb_SECURE_BOOT_defconfig

@@ -39,3 +39,4 @@ CONFIG_USB_STORAGE=y
 CONFIG_RSA=y
 CONFIG_SPL_RSA=y
 CONFIG_RSA_SOFTWARE_EXP=y
+CONFIG_DISTRO_DEFAULTS=y

configs/ls1043ardb_sdcard_SECURE_BOOT_defconfig

@@ -55,3 +55,4 @@ CONFIG_USB_XHCI_DWC3=y
 CONFIG_USB_STORAGE=y
 CONFIG_RSA=y
 CONFIG_SPL_RSA=y
+CONFIG_DISTRO_DEFAULTS=y

include/configs/ls1043a_common.h

@@ -275,6 +275,7 @@
 	"fdt_addr=0x64f00000\0"		 	\
 	"kernel_addr=0x65000000\0"		\
 	"scriptaddr=0x80000000\0"		\
+	"scripthdraddr=0x80080000\0"		\
 	"fdtheader_addr_r=0x80100000\0"		\
 	"kernelheader_addr_r=0x80200000\0"	\
 	"kernel_addr_r=0x81000000\0"		\
@@ -285,6 +286,7 @@
 	"mtdparts=" MTDPARTS_DEFAULT "\0"	\
 	BOOTENV					\
 	"boot_scripts=ls1043ardb_boot.scr\0"	\
+	"boot_script_hdr=hdr_ls1043ardb_bs.out\0"	\
 	"scan_dev_for_boot_part="		\
 		"part list ${devtype} ${devnum} devplist; "	\
 		"env exists devplist || setenv devplist 1; "	\
@@ -295,6 +297,20 @@
 				"run scan_dev_for_boot; "	\
 			"fi; "					\
 		"done\0"			\
+	"scan_dev_for_boot="					\
+		"echo Scanning ${devtype} "			\
+			"${devnum}:${distro_bootpart}...; "	\
+		"for prefix in ${boot_prefixes}; do "		\
+			"run scan_dev_for_scripts; "		\
+		"done;\0"					\
+	"boot_a_script="					\
+		"load ${devtype} ${devnum}:${distro_bootpart} "	\
+			"${scriptaddr} ${prefix}${script}; "	\
+		"env exists secureboot && load ${devtype} "	\
+			"${devnum}:${distro_bootpart} "		\
+			"${scripthdraddr} ${prefix}${boot_script_hdr} "	\
+			"&& esbc_validate ${scripthdraddr};"	\
+		"source ${scriptaddr}\0"			\
 	"installer=load mmc 0:2 $load_addr "	\
 		"/flex_installer_arm64.itb; "	\
 		"bootm $load_addr#ls1043ardb\0"	\
@@ -307,9 +323,11 @@
 
 #undef CONFIG_BOOTCOMMAND
 #if defined(CONFIG_QSPI_BOOT) || defined(CONFIG_SD_BOOT_QSPI)
-#define CONFIG_BOOTCOMMAND "run distro_bootcmd;run qspi_bootcmd"
+#define CONFIG_BOOTCOMMAND "run distro_bootcmd; env exists secureboot"	\
+			   "&& esbc_halt; run qspi_bootcmd;"
 #else
-#define CONFIG_BOOTCOMMAND "run distro_bootcmd;run nor_bootcmd"
+#define CONFIG_BOOTCOMMAND "run distro_bootcmd; env exists secureboot"	\
+			   "&& esbc_halt; run nor_bootcmd;"
 #endif
 
 #define CONFIG_BOOTARGS			"console=ttyS0,115200 root=/dev/ram0 " \