The powerup and configuration sequence is:
1. The board applies power to the system.
2. The MCC powers the EEPROM and reads it to determine the HBI identification code for the board.
3. The system enters standby state.
4. The system enables the microSD memory card. You can connect a workstation to the debug USB port
to edit existing configuration files or Drag-and-Drop new configuration files.
Caution
File names and directory names are in 8.3 format:
• File names that you generate must be in lowercase.
• Directory names must be in uppercase.
• All configuration files must use DOS line endings (0x0D/0x0A).
5. The system stays in standby state until you press the On/Off soft reset button, PBON.
6. The system loads the board configuration file:
• The MCC reads the generic config.txt file.
• The MCC searches the microSD card MB directory for the HBI0309x subdirectory that matches the
HBI code in the board EEPROM.
7. The next steps depend on the configuration files:
• If the MCC finds configuration subdirectories that match the HBI code of the board, configuration
continues and the MCC reads the board.txt file.
• If the MCC does not find the correct configuration files, it records the failure in a log file on the
microSD card. Configuration stops and the system re‑enters the standby state.
8. The MCC measures the board power supplies.
9. The MCC configures the board clocks and FPGA SCC registers.
10. If the MCC finds new software images, it loads them into the QSPI flash, BRAM, or DDR4 memory
through the FPGA.
11. The MCC releases the system resets, CB_nPOR, CB_nRST, and CB_RUN. The system enters the
run state.
12. Normal operation continues until a new event occurs.
Related information
3.5.1 Overview of configuration files and microSD card directory structure on page 3-63
3.5.2 config.txt generic board configuration file on page 3-64
3.5.3 Contents of the MB directory on page 3-64
3.5.4 Contents of the SOFTWARE directory on page 3-66
3 Configuration
3.3 Powerup and configuration sequence
100765_0000_04_en Copyright © 2017–2020 Arm Limited or its affiliates. All rights
reserved.
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Non-Confidential
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