Method and apparatus for performing cache snoop testing on a cache system

A computer system which performs cache snoop testing on a read-only cache system, comprising:

• a CPU;
• system memory coupled to the CPU, the system memory having a test code sequence stored in a first address space thereof;
• a read-only cache system coupled to the CPU and the system memory, the read-only cache system having said test code sequence stored therein and including snooping logic for snooping bus master accesses;
• and
• a bus master which transfers one or more values to a portion of said first address space in the system memory to overwrite a portion of said test code sequence in the system memory;
• wherein if the snooping logic in said read-only cache system is operating properly, the snooping logic snoops said bus master transfer and invalidates one or more lines in the read-only cache system;
• and
• wherein the CPU includes means for executing said test code sequence stored in the read-only cache system, wherein said means for executing determines if the snooping logic performed properly by executing said test code sequence stored in said read-only cache system.