I also have an option 'CSM Support'. When 'Enabled' it allows configuration of three new options: "LAN PXE Boot Option ROM (Disabled/Enabled)", Storage Boot Option Control (Disabled/UEFI Only/Legacy ...
The Raspberry PI Foundation has released beta firmware and a bootloader to enable booting the Raspberry Pi 4 from a USB mass storage device. The new firmware and bootloader could be useful to ...
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