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There are two phases in Secure Boot
1. ISBC: In BootROM, validate the BootLoader (U-Boot).
2. ESBC: In U-Boot, continuing the Chain of Trust by
validating and booting LINUX.
For ESBC phase, there is no difference in SoC's based on ARM or
PowerPC cores.
But the exit conditions after ISBC phase i.e. entry conditions for
U-Boot are different for ARM and PowerPC.
PowerPC:
If Secure Boot is executed, a separate U-Boot target is required
which must be compiled with a diffrent Text Base as compared to
Non-Secure Boot. There are some LAW and TLB settings which are
required specifically for Secure Boot scenario.
ARM:
ARM based SoC's have a fixed memory map and exit conditions from
BootROM are same irrespective of boot mode (Secure or Non-Secure).
Thus the current Secure Boot functionlity has been split into
two parts:
CONFIG_CHAIN_OF_TRUST
This will have the following functionality as part of U-Boot:
1. Enable commands like esbc_validate, esbc_halt
2. Change the environment settings based on bootmode, determined
at run time:
- If bootmode is non-secure, no change
- If bootmode is secure, set the following:
- bootdelay = 0 (Don't give boot prompt)
- bootcmd = Validate and execute the bootscript.
CONFIG_SECURE_BOOT
This is defined only for creating a different compile time target
for secure boot.
Traditionally, both these functionalities were defined under
CONFIG_SECURE_BOOT. This patch is aimed at removing the requirement
for a separate Secure Boot target for ARM based SoC's.
CONFIG_CHAIN_OF_TRUST will be defined and boot mode will be
determine at run time.
Another Security Requirement for running CHAIN_OF_TRUST is that
U-Boot environemnt must not be picked from flash/external memory.
This cannot be done based on bootmode at run time in current U-Boot
architecture. Once this dependency is resolved, no separate
SECURE_BOOT target will be required for ARM based SoC's.
Currently, the only code under CONFIG_SECURE_BOOT for ARM SoC's is
defining CONFIG_ENV_IS_NOWHERE
Signed-off-by: Aneesh Bansal <aneesh.bansal@nxp.com>
Acked-by: Ruchika Gupta <ruchika.gupta@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
61 lines
1.4 KiB
C
61 lines
1.4 KiB
C
/*
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* Copyright 2015 Freescale Semiconductor, Inc.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __FSL_SECURE_BOOT_H
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#define __FSL_SECURE_BOOT_H
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#ifdef CONFIG_SECURE_BOOT
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#ifndef CONFIG_FIT_SIGNATURE
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#define CONFIG_CHAIN_OF_TRUST
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#endif
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#endif
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#ifdef CONFIG_CHAIN_OF_TRUST
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#define CONFIG_CMD_ESBC_VALIDATE
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#define CONFIG_CMD_BLOB
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#define CONFIG_FSL_SEC_MON
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#define CONFIG_SHA_PROG_HW_ACCEL
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#define CONFIG_RSA
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#define CONFIG_RSA_FREESCALE_EXP
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#ifndef CONFIG_FSL_CAAM
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#define CONFIG_FSL_CAAM
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#endif
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#ifndef CONFIG_DM
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#define CONFIG_DM
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#endif
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#define CONFIG_KEY_REVOCATION
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#ifndef CONFIG_SYS_RAMBOOT
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/* The key used for verification of next level images
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* is picked up from an Extension Table which has
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* been verified by the ISBC (Internal Secure boot Code)
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* in boot ROM of the SoC.
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* The feature is only applicable in case of NOR boot and is
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* not applicable in case of RAMBOOT (NAND, SD, SPI).
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*/
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#define CONFIG_FSL_ISBC_KEY_EXT
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#endif
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#ifdef CONFIG_LS1043A
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/* For LS1043 (ARMv8), ESBC image Address in Header is 64 bit */
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#define CONFIG_ESBC_ADDR_64BIT
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#endif
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#define CONFIG_EXTRA_ENV \
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"setenv fdt_high 0xcfffffff;" \
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"setenv initrd_high 0xcfffffff;" \
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"setenv hwconfig \'fsl_ddr:ctlr_intlv=null,bank_intlv=null\';"
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/* The address needs to be modified according to NOR memory map */
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#define CONFIG_BOOTSCRIPT_HDR_ADDR 0x600a0000
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#include <config_fsl_chain_trust.h>
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#endif /* #ifdef CONFIG_CHAIN_OF_TRUST */
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#endif
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