IBM BladeCenter QS20 Problem Determination And Service Manual page 54

v NVRAM
v UART for serial console
v UART for service processor communication
ATA Controller SIL 0680A
This controller resides on the external PCI interface on Southbridge 0 (BE0). The
drive and its associated settings can be found in device-tree. There is no support of
any other card in this slot including extender cards.
Mellanox InfiniBand MHEA28-1TCSB
The firmware supports only this PCI-Express card per socket. There are two
sockets available, one on each I/O bridge. The card and its settings can be found in
device-tree.
Flash Module
The Flash module contains the firmware itself and can be read and written through
firmware and Linux.
NVRAM
The NVRAM module contains configuration and logging information of firmware.
The NVRAM is mapped into the device tree.
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BladeCenter QS20 Type 0200: Problem Determination and Service Guide