ADLINK aTCA-9300 - Manual (Page 68)

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Option ROM Messages
Set this option to enable for allowing system to display PCI devices’ option ROMs
during system boot up.
INT19 Trap Response
Interrupt 19 is the software interrupt that handles the boot disk function. When set to
Enabled, this item allows the option ROMs to trap interrupt 19.
Set Boot Priority
Set Boot Option #1 ~2 boot priority.
Hard Disk Drive BBS Priorities
Specifies the boot device priority sequence from available hard drives.
CSM Parameter
OpROM execution, boot option filter, etc.
6.5.1 CSM Parameter
Launch CSM
This option controls if CSM will be launched.
Set this value to Always / Never.
Boot option filter
This option controls what devices system can boot to.
Set this value to UEFI and Legacy / Legacy only / UEFI only.