A method, computer program product and system for reducing the boot time of a TCPA based computing system. A flash memory in the TCPA based computing system may include a register comprising bits configured to indicate whether the segments of the flash memory have been updated. The flash memory may further include a table configured to store measurements of the segments of the flash memory. The flash memory may further include a boot block code that includes a Core Root of Trust for Measurement (CRTM). The CRTM may read the bits in the register to determine if any of the segments of the flash memory have been updated. The CRTM may further obtain the measurement values in the table for those segments that store the POST BIOS code that have not been updated thereby saving time from measuring the POST BIOS code and consequently reducing the boot time.