Add bootscript support to esbc_validate.

1. Default environment will be used for secure boot flow
 which can't be edited or saved.
2. Command for secure boot is predefined in the default
 environment which will run on autoboot (and autoboot is
 the only option allowed in case of secure boot) and it
 looks like this:
 #define CONFIG_SECBOOT \
 "setenv bs_hdraddr 0xe8e00000;"                 \
 "esbc_validate $bs_hdraddr;"                    \
 "source $img_addr;"                             \
 "esbc_halt;"
 #endif
3. Boot Script can contain esbc_validate commands and bootm command.
 Uboot source command used in default secure boot command will
 run the bootscript.
4. Command esbc_halt added to ensure either bootm executes
 after validation of images or core should just spin.

Signed-off-by: Ruchika Gupta <ruchika.gupta@freescale.com>
Signed-off-by: Gaurav Rana <gaurav.rana@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>

1 files changed, 89 insertions, 0 deletions

diff --git a/include/config_fsl_secboot.h b/include/config_fsl_secboot.h
new file mode 100644
index 00000000000..050b1579021
--- /dev/null
+++ b/include/config_fsl_secboot.h
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2015 Freescale Semiconductor, Inc.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#ifndef __CONFIG_FSL_SECBOOT_H
+#define __CONFIG_FSL_SECBOOT_H
+
+#ifdef CONFIG_SECURE_BOOT
+
+#ifndef CONFIG_CMD_ESBC_VALIDATE
+#define CONFIG_CMD_ESBC_VALIDATE
+#endif
+
+#ifndef CONFIG_EXTRA_ENV
+#define CONFIG_EXTRA_ENV	""
+#endif
+
+/*
+ * Control should not reach back to uboot after validation of images
+ * for secure boot flow and therefore bootscript should have
+ * the bootm command. If control reaches back to uboot anyhow
+ * after validating images, core should just spin.
+ */
+
+/*
+ * Define the key hash for boot script here if public/private key pair used to
+ * sign bootscript are different from the SRK hash put in the fuse
+ * Example of defining KEY_HASH is
+ * #define CONFIG_BOOTSCRIPT_KEY_HASH \
+ *	 "41066b564c6ffcef40ccbc1e0a5d0d519604000c785d97bbefd25e4d288d1c8b"
+ */
+
+#ifdef CONFIG_BOOTSCRIPT_KEY_HASH
+#define CONFIG_SECBOOT \
+	"setenv bs_hdraddr " __stringify(CONFIG_BOOTSCRIPT_HDR_ADDR)";" \
+	"setenv bootargs \'root=/dev/ram rw console=ttyS0,115200 "	\
+	"ramdisk_size=600000\';"	\
+	CONFIG_EXTRA_ENV	\
+	"esbc_validate $bs_hdraddr " \
+	  __stringify(CONFIG_BOOTSCRIPT_KEY_HASH)";" \
+	"source $img_addr;"	\
+	"esbc_halt\0"
+#else
+#define CONFIG_SECBOOT \
+	"setenv bs_hdraddr " __stringify(CONFIG_BOOTSCRIPT_HDR_ADDR)";" \
+	"setenv bootargs \'root=/dev/ram rw console=ttyS0,115200 "	\
+	"ramdisk_size=600000\';"	\
+	CONFIG_EXTRA_ENV	\
+	"esbc_validate $bs_hdraddr;" \
+	"source $img_addr;"	\
+	"esbc_halt\0"
+#endif
+
+/* For secure boot flow, default environment used will be used */
+#if defined(CONFIG_SYS_RAMBOOT)
+#if defined(CONFIG_RAMBOOT_SPIFLASH)
+#undef CONFIG_ENV_IS_IN_SPI_FLASH
+#elif defined(CONFIG_RAMBOOT_NAND)
+#undef CONFIG_ENV_IS_IN_NAND
+#elif defined(CONFIG_RAMBOOT_SDCARD)
+#undef CONFIG_ENV_IS_IN_MMC
+#endif
+#else /*CONFIG_SYS_RAMBOOT*/
+#undef CONFIG_ENV_IS_IN_FLASH
+#endif
+
+#define CONFIG_ENV_IS_NOWHERE
+
+/*
+ * We don't want boot delay for secure boot flow
+ * before autoboot starts
+ */
+#undef CONFIG_BOOTDELAY
+#define CONFIG_BOOTDELAY	0
+#undef CONFIG_BOOTCOMMAND
+#define CONFIG_BOOTCOMMAND		CONFIG_SECBOOT
+
+/*
+ * CONFIG_ZERO_BOOTDELAY_CHECK should not be defined for
+ * secure boot flow as defining this would enable a user to
+ * reach uboot prompt by pressing some key before start of
+ * autoboot
+ */
+#undef CONFIG_ZERO_BOOTDELAY_CHECK
+
+#endif
+#endif