Patent ID: 8644499

Claim:
A system, comprising: a boot read-only memory (ROM); semiconductor chip debug tool operable to debug a semiconductor chip via debug interfaces of a semiconductor chip; and a semiconductor chip that is communicatively coupled to the semiconductor chip debug tool, the semiconductor chip being operable to: boot up according to the boot ROM; identify a debug interface of a plurality of debug interfaces using a first key stored in a one time programmable (OTP) memory; block a plurality of debug interfaces in the semiconductor chip during boot up of the semiconductor chip; permanently block with the first key the identified debug interface of the plurality of debug interfaces during boot up of the semiconductor chip; generate a device identification referring to the semiconductor chip, the generation of the device identification using a second key stored in the OTP memory; store the device identification in memory of the semiconductor chip; use the device identification to authenticate a debug certificate associated with a debug interface of the plurality of debug interfaces; and enable the associated debug interface based on information in the debug certificate, where the authentication is successful and where the associated debug interface is not the permanently blocked debug interface.