Two pages and not a single mention of this feature below, why??
[ https:// download.gigabyte.com/FileList/Manual/mb_manual_b550-vision-d-p_1001_e.pdf ]
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« AMI
UEFI BIOS »
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« Boot Option Priorities
Specifies the overall boot order from the available devices. Removable storage devices that support GPT format will be prefixed with "
UEFI:" string on the boot device list. To boot from an operating system that supports GPT partitioning, select the device prefixed with "
UEFI:" string.
Or if you want to install an operating system that supports GPT partitioning such as Windows 10 64-bit, select the optical drive that contains the Windows 10 64-bit installation disc and is prefixed with "
UEFI:" string. »
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« CSM Support
Enables or disables
UEFI CSM (Compatibility Support Module) to support a legacy PC boot process.
Disabled Disables
UEFI CSM and supports
UEFI BIOS boot process only.
Enabled Enables
UEFI CSM. (Default)
...
Storage Boot Option Control
Allows you to select whether to enable the
UEFI or legacy option ROM for the storage device controller.
Disabled Disables option ROM.
UEFI Only Enables
UEFI option ROM only. (Default)
Legacy Only Enables legacy option ROM only.
This item is configurable only when CSM Support is set to Enabled.
Other PCI Device ROM Priority
Allows you to select whether to enable the
UEFI or Legacy option ROM for the PCI device controller other
than the LAN, storage device, and graphics controllers.
Disabled Disables option ROM.
UEFI Only Enables
UEFI option ROM only. (Default)
Legacy Only Enables legacy option ROM only.
This item is configurable only when CSM Support is set to Enabled. »
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« C.
UEFI RAID Configuration
Steps:
...
(Note) An M.2 PCIe SSD cannot be used to set up a RAID set either with an M.2 SATA SSD or a SATA hard drive. »