QLogic OFED+ Host Software User Guide, Rev. B

8–gPXE
Preparing the DHCP Server in Linux
Required Steps
• A second stage boot loader
• A live CD Linux image
• A gPXE script
1. Download a copy of the gPXE image.
Located at:
• The executable to flash the EXPROM on the TrueScale InfiniBand
adapters is located at: /usr/sbin/ipath_exprom
• The gPXE driver for QLE7200 series InfiniBand adapters (the
EXPROM image) is located at:
/usr/share/infinipath/gPXE/iba7220.rom
• The gPXE driver for QLE7300 series InfiniBand adapters (the
EXPROM image) is located at:
/usr/share/infinipath/gPXE/iba7322.rom
2. In order for dhcpd to correctly load, assign IP addresses to the InfiniBand
adapter GUID. The dhcpd on the existing DHCP server may need to be
patched. This patch will be provided via the gPXE rpm installation.
3. Write the ROM image to the InfiniBand adapter.
This only needs to be done once per InfiniBand adapter.
ipath_exprom -e -w iba7xxx.rom
In some cases, executing the above command results in a hang. If you
experience a hang, type CTRL+C to quit, then execute one flag at a time:
ipath_exprom -e iba7xxx.rom
ipath_exprom -w iba7xxx.rom
4. Enable booting from the InfiniBand adapter (gPXE device) in the BIOS
Preparing the DHCP Server in Linux
Installing DHCP
When the boot session starts, the gPXE firmware attempts to bring up an adapter
network link. If it succeeds to bring up a connected link, the gPXE firmware
communicates with the DHCP server. The DHCP server assigns an IP address to
the gPXE client and provides it with the location of the boot program.
gPXE requires that the DHCP server runs on a machine that supports IP over IB.
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