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System and method for accessing peripheral devices on a non-functional controller

  • US 5,729,767 A
  • Filed: 10/07/1994
  • Issued: 03/17/1998
  • Est. Priority Date: 10/07/1994
  • Status: Expired due to Term
First Claim
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1. A method for accessing a memory in a bus adapter of a computer system, the computer system comprising a CPU, a first bus coupled to the CPU, and the bus adapter coupled to the first bus, wherein the bus adapter comprises a bus interface for coupling to said first bus, a second bus coupled to said bus interface, a local processor coupled to said second bus, a peripheral bus coupled to said bus interface, and the memory coupled to said peripheral bus, the method comprising:

  • configuring said memory coupled to said peripheral bus to map to said bus interface, wherein said memory is accessible by said CPU when said memory is mapped to said bus interface;

    said CPU beginning a startup routine after said configuring said memory, wherein said CPU detects said memory coupled to said peripheral bus as being mapped to said bus interface;

    said CPU accessing said memory coupled to said peripheral bus in said bus adapter after said CPU beginning said startup routine;

    reconfiguring said memory to unmap said memory from said bus interface after said CPU accessing said memory, wherein said memory is accessible to said local processor comprised in said bus adapter in response to said reconfiguring; and

    said CPU restarting after said reconfiguring said memory.

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