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Secure Boot with i.MX28 HAB Version 4, Rev. 1

Freescale Semiconductor 3

Introduction

1.4 Definitions, acronyms, and abbreviations

Table 1. Definitions, acronyms, and abbreviations

Term/Acronym Definition

BD file Boot descriptor file, an input file to Elftosb that describes the flow of boot and different binary

and elf images included in the final SB file.

Bootlet A bootlet is an image that can be executed on i.MX28 processor using ROM command CALL

HAB. These are generally small images that can be used to configure peripherals on board

such as external memory, voltage rails, etc., before loading larger images like bootloader or

operating system.

CA Certificate Authority, the holder of a private key used to certify public keys.

CSF Command Sequence File, a binary data structure interpreted by HAB to guide authentication

operations.

CST Code Signing Tool, an application running on a host to generate a binary CSF and associated

digital signatures.

DCD Device Configuration Data, a binary table used by the ROM code to configure the device at the

early boot stage.

DCP Data Co-Processor, a cryptographic accelerator (including hash acceleration) found on some

processors including i.MX28.

Elftosb Freescale tool available for Windows and Linux to generate i.MX28 boot images.

HAB High Assurance Boot, a software library executed in internal ROM on the Freescale processor

at boot time which, among other things, authenticates software in external memory by verifying

digital signatures in accordance with a CSF. This document is limited to HAB v4, as configured

on i.MX28 processors.

IVT Image Vector Table.

OS Operating System.

OTP One-Time Programmable. OTP hardware includes masked ROM and electrically

programmable fuses (e-fuses).

PKCS#1 Standard specifying the use of the RSA algorithm.

PKI Public Key Infrastructure, a hierarchy of public key certificates in which each certificate (except

the root certificate) can be verified using the public key above it.

RSA Public key cryptography algorithm developed by Rivest, Shamir and Adleman.

RVT The ROM Vector Table (RVT) contains addresses of the HAB APIs available.

SA Signature Authority, the holder of a private key used to sign software components.

SB file A bootable image on i.MX28. It is generated using Elftosb tool and consists of header and

multiple sections including a section with ROM Boot Commands.

1 2 3 4 5 6 7 8 ... 30 31

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