System and method for emulating serial port communication

• US 7,809,546 B2
• Filed: 05/01/2007
• Issued: 10/05/2010
• Est. Priority Date: 05/02/2003
• Status: Expired due to Fees

• Current Assignee: Egenera Incorporated
• Original Assignee: Egenera Incorporated
• Inventors: Haley, Neil, Maynard, Justin
• Primary Examiner(s): Shah; Kamini S
• Assistant Examiner(s): DAY, HERNG DER
• Application Number:
  US11/799,294
• Publication Number:
  US 20070203686A1
• Time in Patent Office: 1,253 Days
• Field of Search: 703/21, 703/23, 703/24, 703/25, 710/300, 713/2
• US Class Current: 703/25
• CPC Class Codes: G06F 13/105 where the programme performs an input/output emulation function

Abstract

A method and system of emulating serial com port communication. A computer processing system has computer-executable operating system instructions including first instructions that interact with a first serial device according to a predefined input/output (I/O) hardware interface. A first serial device has a receive port and a transmit port and has the predefined (I/O) hardware interface. A second serial device has a receive port and a transmit port. The transmit port of the first serial device is in serial communication with the receive port of the second serial device, and the receive port of the first serial device is in serial communication with the transmit port of the second serial device. Computer-executable instructions emulate serial communication port device communication and include instructions that transmit information over another medium in response to receive requests from the second serial device.

Claims

1. In a computer processing system having a processor including an operating system having computer-executable operating system instructions including instructions for communicating with a first serial device directly using a first medium according to a predefined input/output (I/O) hardware interface, a serial communication port emulation system to provide serial port communication over an alternate medium, comprising:

the first serial device connected to said processor and operating under the control of said operating system, the first serial device having a receive port and a transmit port and having the predefined I/O hardware interface;

a second serial device connected to said processor and operating under the control of BIOS or driver software instructions executed on said processor, the first serial device and second serial device residing within said computer processing system, the second serial device having a receive port and a transmit port, the transmit port of the first serial device being in serial communication with the receive port of the second serial device, and the receive port of the first serial device being in serial communication with the transmit port of the second serial device; and

computer-executable instructions, responsive to serial port communication between the first serial device and the second serial device, to emulate serial communication port communication over the alternate medium and conveying a message on the alternate medium.

2. The computer processing system of claim 1, wherein the emulation instructions further include instructions, responsive to a communication received from the alternate medium, that transmit information representative of the received communication to the transmit port of the second serial device, wherein the second serial device then conveys the received communication to the receiver port of the first serial device and the first serial device conveys the received communication to the operating system instructions.

3. The computer processing system of claim 2, wherein the alternate medium comprises a packet-based network.

4. The computer processing system of claim 2, wherein the alternate medium comprises a cell-based network.

5. The computer processing system of claim 1, wherein the emulation instructions operate in response to events generated by the second serial device.

6. The computer processing system of claim 1, wherein the emulation system communicates with at least one console device.

7. The computer processing system of claim 1, wherein the operating system communicates directly and solely with the predefined I/O hardware interface.

8. The computer processing system of claim 1, wherein the alternate medium comprises a frame-based network.

9. The computer processing system of claim 1, wherein the alternate medium comprises a time division multiplex (TDM)-based network.

10. The computer processing system of claim 1, wherein the emulation instructions include instructions that transmit information over the alternate medium in response to receive requests from the second serial device, the transmitted information including information representative of the receive request from the second serial device;

and whereby transmissions to the first serial device by the operating system instructions are transmitted over the alternate medium and serial communication port communication is thereby emulated over the alternate medium.

11. The computer processing system of claim 1, wherein the BIOS or driver software instructions executed on said processor are associated with an interrupt service.

12. A method of emulating serial communication port communication over an alternative transport in a computer processing system having a processor including an operating system, comprising:

the operating system communicating a first message directly with a hardware interface of a first serial communication port device;

the first serial communication port device connected to the processor and operating under the control of the operating system, said first serial communication port device sending the first message from the operating system on to a receive port of a second serial communication port device;

the second serial communication port device connected to the processor and operating under the control of BIOS or driver software instructions executed on the same processor, the first and second serial communication port devices residing within said computer processing system, said second serial communication port device generating information indicative of the receipt of the first message;

emulation logic, in response to the generated information, conveying the first message on the alternative transport to thereby emulate serial communication port communication on the alternative transport.

13. The method of claim 12, further comprising:

receiving a second message on the alternative transport;

invoking the emulation logic in response thereto to receive information from the second message;

sending the received information to a transmit port of the second serial communication port device;

the second serial communication port device sending the received information to a receive port of the first serial communication port device; and

the operating system communicating with the first serial communication port device to process the received information.

14. The method of claim 12, wherein the emulation logic operates in response to events generated by the second serial communication port device.

15. The method of claim 12, wherein the hardware interface of the second serial communication port device communicates with at least one console device.

16. The method of claim 12, wherein the alternative transport comprises a packet-based network.

17. The method of claim 12, wherein the alternative transport comprises a cell-based network.

18. The method of claim 12, wherein the alternative transport comprises a frame-based network.

19. The method of claim 12, wherein the alternative transport comprises a time division multiplex (TDM)-based network.

20. The method of claim 12, wherein the BIOS or driver software instructions executed on the same processor are associated with an interrupt service.