Switching between BIOS and UEFI (and vice versa) on a Dell R730

These are some notes I want to keep handy. They will help me switch back and forth between UEFI and BIOS booting.

In this post:

• FreeBSD 14.1
• Dell R730

To move from BIOS boot to UEFI boot

• System BIOS |
  Boot Settings: Boot Mode = UEFI
• System BIOS |
  System Settings |
  Device Settings |
  PERC: Select Boot Device = None
• Then you have to wait for it to boot, query devices, the go back into:
• F2 – System Setup |
  System BIOS |
  Boot Settings |
  UEFI Boot Settings |
  UEFI Boot Sequence – move your drives to the top of the list.

Switch to SATADOM booting

The SATADOM are configured for UEFI booting.

• For BIOS/UEFI booting:
  
  System Setup |
  System BIOS |
  Boot Settings: select UEFI
• To see SATADOM devices (i.e. enable directly attached SATA ports)
  
  System Setup |
  System BIOS |
  SATA Settings: Embedded SATA = AHCI Mode
• Boot Mode = UEFI
  UEFI Boot Settings: Check your boot sequence so the correct devices are first
• This setting controls the selection of boot device from the HBA:
  System Setup |
  Device Settings |
  Integrated RAID Controller 1: DELL PERC Configuration Utility |
  Controller Management: Select Boot Device = the device you want to boot from

Future work will add how to move from BIOS to UEFI, but the above should be a good start.