MCIMX281AVM4B Freescale Semiconductor, MCIMX281AVM4B Datasheet - Page 969

• Manufacturer Part Number: MCIMX281AVM4B
• Description: IC MPU I.MX28 1.2 289MAPBGA
• Manufacturer: Freescale Semiconductor
• Series: i.MX28r

Specifications of MCIMX281AVM4B

• Core Processor: ARM9
• Core Size: 32-Bit
• Speed: 454MHz
• Connectivity: CAN, EBI/EMI, Ethernet, I²C, MMC, SmartCard, SPI, SSI, UART/USART, USB OTG
• Peripherals: DMA, I²S, LCD, POR, PWM, WDT
• Program Memory Size: 128KB (32K x 32)
• Program Memory Type: Mask ROM
• Ram Size: 32K x 32
• Voltage - Supply (vcc/vdd): 1.25 V ~ 5.25 V
• Data Converters: A/D 17x12b
• Oscillator Type: External
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 289-LFBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Number Of I /o: -
• Eeprom Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

For further details on making use of the High Assurance Boot feature of i.MX28, please
contact your local Freescale representative.
12.7.1 ROM Vector Table Addresses
For devices that are performing a secure boot using HAB, the HAB library may be called
from additional boot stages that execute after ROM code. The RVT table contains the
pointers to the HAB API functions such that these boot stage can authenticate the stage that
follows. The RVT is fixed in ROM and is located at 0xFFFF8508.
For additional information on using HAB on i.MX28, including the HAB API, please contact
your local Freescale representative.
12.8 Constructing Boot Image (SB Files) to Be Loaded by ROM
Boot images are created by the Freescale supplied elftosb application, which handles both
encryption and HAB signature if required. Freescale provides a sample code signing tool.
It can be used for reference purposes in integrating with third-party tools or a proprietary
signing infrastructure.
Preparing a bootable image for all boot modes includes the following high-level steps:
The following figures shows the process of creating a boot loader image from ELF files by
elftosb. A key set must be input to the elftosb program to properly encrypt and authenticate
the image.
Freescale Semiconductor, Inc.
1. Prepare the unsigned Image ELF file for the firmware that is to be booted by the ROM.
2. Sign the image with the code signing tool, which generates one HAB.ELF file (Freescale
3. Use the elftosb tool to combine the unsigned Image ELF and HAB.ELF together and
• X.509 pulic key certificate support
• CMS signature format support
provides example tools, and third party code signing tools may also be available. Contact
your local Freescale representative for further details). This file contains the CSF (HAB
command sequence file) and certificates.
convert them to a boot stream (SB file), which the ROM loader will understand. The
elftosb tool also handles encryption if an encryption key is provided.
i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
Chapter 12 Boot Modes
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