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<p>Read Root Port Error FIFO Message. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">InstancePtr</td><td>is the PCIe component to operate on. </td></tr>
    <tr><td class="paramname">ReqIdPtr</td><td>is a variable where the driver will pass back the requester Id of error message. </td></tr>
    <tr><td class="paramname">ErrType</td><td>is a variable where the driver will p