公开(公告)号：US20210365557A1

公开(公告)日：2021-11-25

申请号：US16880819

申请日：2020-05-21

Applicant: QUALCOMM Incorporated

Inventor： Jaydeep CHOKSHI ,  Miguel BALLESTEROS ,  Mahadevamurty NEMANI ,  Samar ASBE ,  Girish BHAT ,  Alan YOUNG ,  Victor WONG ,  Steven HALTER

IPC: G06F21/57 ,  G06F21/44 ,  G06F11/36 ,  G06F13/42

Abstract: A method for external access control to protect system-on-chip (SoC) subsystems and stored subsystem assets is described. The method includes sensing, during a cold boot of an SoC hardware system, a debug fuse vector for access to SoC subsystems of an SoC owner and/or third-party subsystems of an SoC hardware architecture. The method also includes disabling access to each SoC subsystem with a blown fuse in the debug fuse vector. The method further includes re-enabling, by a secure root of trust, access to an SoC subsystem and/or a third-party subsystem for an external debugger when authentication of one or more debug certificates of a third-party owner of the external debugger is successful.