check8 is a command-line utility designed to verify and correct 8-bit checksum values in binary ROM files. It is primarily used during the firmware compilation and assembly process to ensure data integrity.

Overview#

The utility calculates the 8-bit checksum of a specified binary file and can automatically update the file to include the correct checksum value. This is essential when modifying ECU maps or custom firmware to prevent checksum-related errors during ECU initialization.

Important

Ensure the binary file is not currently in use by another process or emulator before running the utility to prevent file access errors.

Usage#

The utility is executed via the command line. Standard syntax typically requires the target filename as an argument:

check8 <filename.bin>

Features#

• Verification: Scans the binary file and compares the existing checksum against the calculated value.
• Correction: Automatically patches the binary file with the correct 8-bit checksum if a mismatch is detected.
• Compatibility: Compatible with standard binary ROM formats used in OBD-series ECU tuning.

Availability#

The utility is provided as part of the Keil compiler toolchain. It can be obtained through the official Keil website0.