Method and apparatus for remotely altering programmable firmware stored in an interactive network board coupled to a network peripheral

• US 5,623,604 A
• Filed: 11/18/1992
• Issued: 04/22/1997
• Est. Priority Date: 11/18/1992
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Information Systems Incorporated (Canon Inc.)
• Inventors: Kalwitz, George A., Russell, William C., Barrett, Lorraine F.
• Primary Examiner(s): Donaghue, Larry D.
• Assistant Examiner(s): Rinehart, Mark H.
• Application Number:
  US07/978,411
• Time in Patent Office: 1,616 Days
• Field of Search: 395/800, 395/200.07, 395/200.09, 395/200.1, 395/430, 395/834, 395/183.14, 395/700, 364/DIG. 1, 364/DIG. 2, 364/276.3, 364/281.9, 364/280.3, 364/962.1, 340/825.06, 340/825.08, 340/825.22, 340/825.05, 340/825.3, 340/825.5, 370/85.1, 370/85.8
• US Class Current: 717/167
• CPC Class Codes: G06F 8/60 Software deployment
• CPC Class Codes: H04L 67/34 involving the movement of software or configuration parameters network booting or remote initial program loading [RIPL] G06F9/4416
• CPC Class Codes: H04L 9/40 Network security protocols

Abstract

Method and apparatus for remotely altering programmable firmware stored in a PROM disposed on a target interactive network board having a local area network interface comprises activating a local area network communication program. The communication program operates to broadcast an inquiry through the local area network for the designated interactive network board, to receive location information of the designated board in response to the broadcast inquiry, and to establish communication with the designated board. A ROM firmware image is downloaded into a RAM on the designated board, preferably through the local area network interface. A verifying step verifies that the ROM firmware image stored in RAM is valid, and the PROM is controlled to erase memory locations, to transfer preservable data from the PROM into predetermined locations within the ROM firmware image stored in RAM, and to load into the PROM the ROM firmware image from the RAM. After completing the flash operation, the designated board may be re-initialized to execute instructions from the firmware image stored in the PROM.

Claims

1. In a local area network, a method for remotely updating an old ROM firmware image stored in a PROM disposed on a designated interactive network board having a local area network interface, said method comprising the steps of:

activating a local area network communication program, said communication program operating (i) to broadcast an inquiry through the local area network for the designated interactive network board, (ii) to receive location information of the designated interactive network board in response to the broadcast inquiry, and (iii) to establish communication with the designated interactive network board via the local area network interface;

downloading, over the local area network interface, a new ROM firmware image into a RAM on the designated interactive network board;

verifying that the new ROM firmware image stored in the RAM is valid prior to loading the new ROM firmware image from the RAM into the PROM;

updating firmware of the PROM, in a case where the new ROM firmware image is valid, by (i) storing a predesignated portion of the old ROM firmware image in the RAM, (ii) erasing predetermined PROM storage locations, and (iii) loading the new ROM firmware image and the predesignated portion of the old ROM firmware image from the RAM into the PROM; and

re-initializing the designated interactive network board, in a case where the new ROM firmware image is valid, using the new ROM firmware image and the predesignated portion of the old ROM firmware image loaded in the PROM.

2. A method according to claim 1, further comprising the step of, after said step of re-initializing, loading instructions from the PROM to the RAM.

3. A method according to claim 1, wherein the step of activating includes the step of storing the new ROM firmware image in a local area network file server.

4. A method according to claim 3, wherein the step of downloading includes the step of retrieving, from the local area network file server, the new ROM firmware image.

5. A method according to claim 1, further comprising the step of matching a designated identifier stored in the PROM with a designated identifier in the new ROM firmware image stored in the RAM, and in the case the designated identifier stored in the PROM does not match the designated identifier stored in the RAM, further including the step of outputting an error signal from said board.

6. A method according to claim 1, wherein said step of verifying performs a checksum operation on the new ROM firmware image stored in the RAM and, in the case the checksum operation fails, performs a further step of outputting an error signal from said board indicating that the checksum operation has failed.

7. A method according to claim 1, wherein said step of controlling controls the PROM to erase all memory locations except a board identifier location.

8. A method according to claim 7, wherein said step of updating loads the new ROM firmware image from the RAM into erased memory locations of the PROM.

9. A method according to claim 1, wherein the activating step broadcasts a MAC address through the LAN and established communication with the board after the board has responded to the inquiry by sending its address and location.

10. A method according to claim 1, further comprising the step of disposing a test interface on said board for providing a communication link to a test station, and wherein said step of downloading includes the step of downloading the new ROM firmware image, the designated identifier, and a checksum through the test interface from the test station into the RAM.

11. A method according to claim 1, further comprising the step of disposing a remote LAN device for remotely downloading the new ROM firmware image, the designated identifier, and a checksum packet into the RAM via the local area network interface.

12. A method according to claim 1, further comprising the step of disposing a SCSI interface on the board.

13. A method according to claim 1, further comprising a step of verifying a designated identifier in the new ROM firmware image with a designated identifier stored in a ROM disposed on the designated interactive network board before said step of updating.

14. In a local area network, an apparatus for remotely altering an old ROM firmware image stored in a PROM disposed on a designated interactive network board having a local area network interface, said apparatus comprising:

local area network communicating means (i) for broadcasting an inquiry through a local area network for the designated interactive network board, (ii) for receiving location information of the designated interactive network board in response to the broadcast inquiry, (iii) for establishing communication with the designated interactive network board via the local area network interface, and (iv) for downloading to the designated interactive network board, over the local area network interface, a new ROM firmware image, a designated identifier code, and a checksum packet;

a RAM, resident on the designated interactive network board, for storing the new ROM firmware image, designated identifier code, and checksum packet;

a PROM, resident on the designated interactive network board, for storing the old ROM firmware image and another designated identifier code;

comparing means, resident on the designated interactive network board, for performing a checksum operation on the new ROM firmware image stored in said RAM, prior to loading the new ROM firmware image into said PROM, using the checksum packet stored in said RAM; and

control means for controlling said PROM, in a case where the new ROM firmware image is valid, (i) to preserve a predesignated portion of the old ROM firmware image by storing the predesignated portion of the old ROM firmware image in said RAM, (ii) to erase predetermined PROM storage locations, (iii) to load the new ROM firmware image and the predesignated portion of the old ROM firmware image from said RAM into said PROM, and (iv) to re-initialize the designated interactive network board using the new ROM firmware image and the predesignated portion of the old ROM firmware image loaded in said PROM.

15. An apparatus according to claim 14, wherein said comparing means compares the designated identifier code stored in the RAM with the another designated identifier code stored in said ROM.

16. An apparatus according to claim 14, wherein the designated interactive network board is coupled to a LAN printer.

17. An apparatus according to claim 14, wherein the RAM comprises a dynamic RAM.

18. An apparatus according to claim 14, wherein the PROM comprises a flash EPROM.

19. Apparatus according to claim 14, further comprising a test interface, disposed on said designated interactive network board and connected to said RAM, for providing a communication link to a test station, and wherein the new ROM firmware image, designated identifier, and a checksum are downloaded through the test interface from said test station into the RAM.

20. An apparatus according to claim 14, further comprising a remote LAN device, connected to said local area network communicating means via the local area network interface, for remotely downloading the new ROM firmware image, designated identifier, and checksum packet into the RAM.

21. Apparatus according to claim 14, further comprising a SCSI interface disposed on said designated interactive network board for providing a communications link to a peripheral device.

22. In a local area network (LAN), an apparatus for remotely altering old ROM firmware in a PROM disposed on an interactive network board coupled to the LAN, said apparatus comprising:

a LAN interface, disposed on the interactive network board, for receiving from a remote LAN location, new ROM firmware and a verification signal;

a RAM, disposed on the interactive network board, for storing the new ROM firmware, a predesignated portion of the old ROM firmware, and the verification signal; and

a processor, disposed on the interactive network board, for (i) causing the new ROM firmware and verification signal to be stored in said RAM, (ii) verifying that the new ROM firmware is valid using the verification signal prior to loading the new ROM firmware into the PROM, (iii) writing the predesignated portion of the old ROM firmware the PROM to said RAM in a case where the new ROM firmware is valid, (iv) updating the old ROM firmware in the PROM by loading the new ROM firmware and the predesignated portion of the old ROM firmware into the PROM from said RAM in a case where the new ROM firmware is valid, and (v) re-initializing the interactive network board using the new ROM firmware and the predesignated portion of the old ROM firmware stored in the PROM in a case where the new ROM firmware is valid.

23. In a local area network, an apparatus for remotely altering an old ROM firmware image stored in a PROM disposed on a designated interactive network board having a local area network interface coupled to the local area network, the local area network interface for downloading a new ROM firmware image and a checksum packet over the local area network, said apparatus comprising:

a RAM, resident on the designated interactive network board, for storing the new ROM firmware image and the checksum packet;

a PROM, resident on the designated interactive network board, for storing the old ROM firmware image;

comparing means, resident on the designated interactive network board, for performing a checksum operation on the new ROM firmware image stored in said RAM using the checksum packet stored in said RAM in order to validate the new ROM firmware image, the checksum operation being performed prior to loading the new ROM firmware image into said PROM; and

control means, resident on the designated interactive network board, for controlling said PROM to update at least a portion of the old ROM firmware image stored in said PROM in a case where the new ROM firmware image is valid by (i) transferring portions of the old ROM firmware image which are to be preserved to said RAM, (ii) erasing from said PROM at least those portions of the old ROM firmware image which are not to be preserved, (iii) loading from said RAM into said PROM the new ROM firmware image and the portions of the old ROM firmware image transferred to said RAM, and (iv) re-initializing the designated interactive network board using the new ROM firmware image and the portions of the old ROM firmware image transferred to said PROM.