1. A system comprising: a central processing unit (CPU) complex including at least one first processor; and a security circuit coupled to the CPU complex and configured to provide one or more secure services in the system, wherein the security circuit includes at least one second processor and a boot read-only memory (ROM) coupled to the at least one second processor, and wherein the boot ROM is inaccessible to circuitry outside the security circuit within the system, and wherein the at least one second processor is configured to boot directly from the boot ROM, and wherein the code from the boot ROM is not stored in software-accessible memory, and wherein the at least one second processor, in response to executing the code, is configured to authenticate the code.