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Firmware updates during limited time period

  • US 8,887,144 B1
  • Filed: 09/04/2009
  • Issued: 11/11/2014
  • Est. Priority Date: 09/04/2009
  • Status: Active Grant
First Claim
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1. A computer-implemented method for managing access to firmware, comprising:

  • under control of one or more computer systems configured with executable instructions,triggering a clock for a peripheral device on a host machine at a time after power is supplied to the peripheral device, the clock configured to initiate a period of mutability with respect to the peripheral device;

    enabling firmware of the peripheral device to be updated during the period of mutability;

    disabling updates to the firmware of the peripheral device after the period of mutability, the period of mutability being determined based at least in part upon the clock; and

    after the period of mutability, loading a guest operating system onto the host machine,wherein the guest operating system has non-virtualized direct memory access to the peripheral device but the guest operating system is unable to modify the firmware of the peripheral device.

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