IBM xSeries 380 Hardware Maintenance Manual page 232

these jumper blocks you need to expose the OEM I/O Baseboard by following the
instructions in "I/O baseboard removal" on page 196.
The following illustration shows where the jumper blocks reside on the OEM I/O
baseboard.
Including the BMC in the JTAG chain
Jumper block J8D1 lets you include or exclude the BMC in the JTAG chain. By default,
the BMC is excluded from the JTAG chain.
The following illustration shows the jumper settings.
Overriding the hardware PCI hot plug interlock
Jumper block J1A1 lets you override the hardware PCI hot plug interlock switches.
By default, the jumper setting allows for the slot's interlock switch and/or the PID's
GPIO27 to set the interlock value.
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Hardware Maintenance Manual: xSer ies 380
J1A1
J8D1 Include BMC in the JTAG Chain
J1A1 Override the PCI Hot Plug Interlock Switches
1
Excludes BMC from the JTAG Chain (Default Setting)
2
Includes BMC in the JTAG Chain
J8D1