Intel SR870BN4 - Server Platform - 0 MB RAM Product Manual page 157

Service partition 2
scan
[1]
(semi-volatile)
Table 30. Boot Option Parameters (continued)
Parameter #
BMC boot flag 3
valid bit clearing
[1]
(semi-volatile)
Boot info
4
acknowledge
[1]
(semi-volatile)
Intel® SR870BN4 Server System Product Guide
Data 1
[7:2] - Reserved
[1] - 1b = Request BIOS to scan for specified service partition. BIOS clears
this bit after the requested scan has been performed.
[0] - 1b = Service Partition discovered. The BIOS sets this bit to indicate it
has discovered the specified service partition. The BIOS must clear
this bit on all system resets and power ups, except when a scan is
requested.
Parameter Data (non-volatile unless otherwise noted)
Data 1 - BMC boot flag valid bit clearing. Default = 0000b.
[7:5] - Reserved
[4] - 1b = Do not clear valid bit on reset/power cycle caused by PEF
[3] - 1b = Do not automatically clear boot flag valid bit if IPMI Chassis
Control command not received within 60-second timeout (countdown
restarts when a IPMI Chassis Control command is received)
[2] - 1b = Do not clear valid bit on reset/power cycle caused by watchdog
timeout
[1] - 1b = Do not clear valid bit on pushbutton reset / soft-reset
(e.g. "Ctrl-Alt-Del")
[0] - 1b = Do not clear valid bit on power up via power pushbutton or wake
event
These flags are used to allow individual parties to track whether they've 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 0's 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
continued
continued
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