What is the term for validating the device bootloader before it boots up?

The term for validating the device bootloader before it boots up is known as "Secure Boot Process." This security feature ensures that only trusted software is loaded during the startup phase of the device. The Secure Boot process works by verifying the digital signatures of the bootloader and any operating system components before they are executed. If the signatures do not match the trusted certificates stored in the firmware, the boot process is halted, preventing potentially malicious software from being loaded.

This approach is essential for maintaining the integrity of the system from the moment it powers on, as it protects against rootkits and other forms of malware that can infect a device at boot time. Additionally, Secure Boot is often implemented in conjunction with other security measures, such as the use of Trusted Platform Modules (TPM), to provide a robust defense against unauthorized access and manipulation.