Symptom
Operating Systems (OSes) which are not Unified Extensible Firmware Interface (UEFI) aware can fail at the point of bootstrapping the OS from local hard disk drives (HDDs). The issue occurs when a Host Bus Adapter (HBA) is installed in the server and attached to external storage. The issue has only been seen with the QLogic and Emulex HBAs, but may be seen with other manufacturers' HBAs. One of the symptoms of this issue is seen at the point where the OS normally starts to load, but instead, the end user will see the "feed me" screen, indicating an unsuccessful bootstrap of the OS.
分析：
The symptoms described occur because UEFI firmware sees devices in one order and legacy firmware sees them in a different order due to basic differences in UEFI and legacy firmware with respect to devices. There is a need to prevent the externally attached storage devices from being mapped in both UEFI and "Legacy Only" modes.
解决办法，按F1进UEFI， 然后把“Legacy Only”放到boot order的第一位。
The Workaround resolves the issue by forcing device mapping to be performed in legacy mode only and ensures that the Legacy ROM of the HBA connected to the external storage does not execute.
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