Dell PowerEdge 7250 - Manual (Page 82)

80 Terminal Mode Commands
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Boot info
acknowledge
(semi-volatile)
4 These flags are used to allow individual parties to track whether
they have already seen and handled the boot information.
Applications that deal with boot information should check the
boot info and clear their corresponding bit after consuming the
boot options data.
Data 1: Write Mask (write-only—This field is returned as 00h
when read. This is to eliminate the need for the BMC to provide
storage for the Write Mask field.)
[7] - 1b = enable write to bit 7 of Data field.
[6] - 1b = enable write to bit 6 of Data field.
[5] - 1b = enable write to bit 5 of Data field.
[4] - 1b = enable write to bit 4 of Data field.
[3] - 1b = enable write to bit 3 of Data field.
[2] - 1b = enable write to bit 2 of Data field.
[1] - 1b = enable write to bit 1 of Data field.
[0] - 1b = enable write to bit 0 of Data field.
Data 2: Boot Initiator Acknowledge Data.
The boot initiator should typically write FFh to this parameter
prior to initiating the boot. The boot initiator may write 0s if it
wants to intentionally direct a given party to ignore the boot info.
This field is automatically initialized to 00h when the management
controller is first powered up or reset.
[7] - reserved. Write as 1b. Ignore on read.
[6] - reserved. Write as 1b. Ignore on read.
[5] - reserved. Write as 1b. Ignore on read.
[4] - 0b = OEM has handled boot info.
[3] - 0b = SMS has handled boot info.
[2] - 0b = OS / service partition has handled boot info.
[1] - 0b = OS Loader has handled boot info.
[0] - 0b = BIOS/POST has handled boot info.
Table C-5. Boot Option Parameters (continued)
Parameter Number Parameter Data (non-volatile unless otherwise noted)