warp7: hab: Set environment variable indicating HAB enable

This patch adds an environment variable called "hab_enabled" which gets set
to a boolean status indicating whether HAB is enabled or not.

Subsequent patches can use this environment variable to determine if its
necessary to run a given binary through the hab_auth_img console command.

Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Tested-by: Breno Lima <breno.lima@nxp.com>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>

board/warp7/warp7.c

@@ -10,6 +10,7 @@
 #include <asm/arch/mx7-pins.h>
 #include <asm/arch/sys_proto.h>
 #include <asm/gpio.h>
+#include <asm/mach-imx/hab.h>
 #include <asm/mach-imx/iomux-v3.h>
 #include <asm/mach-imx/mxc_i2c.h>
 #include <asm/io.h>
@@ -203,6 +204,13 @@ int board_late_init(void)
 	 */
 	clrsetbits_le16(&wdog->wcr, 0, 0x10);
 
+#ifdef CONFIG_SECURE_BOOT
+	/* Determine HAB state */
+	env_set_ulong(HAB_ENABLED_ENVNAME, imx_hab_is_enabled());
+#else
+	env_set_ulong(HAB_ENABLED_ENVNAME, 0);
+#endif
+
 #ifdef CONFIG_SERIAL_TAG
 	/* Set serial# standard environment variable based on OTP settings */
 	get_board_serial(&serialnr);

include/configs/warp7.h

@@ -139,4 +139,7 @@
 
 #define CONFIG_USBNET_DEV_ADDR		"de:ad:be:af:00:01"
 
+/* Environment variable name to represent HAB enable state */
+#define HAB_ENABLED_ENVNAME		"hab_enabled"
+
 #endif