Chapter 7. IBM System x3690 X5 319
Figure 7-16 Legacy Thunk Support in UEFI
Another possible solution to this problem is booting the server in Legacy Only mode. This
mode allows both non-UEFI-aware OSs and PCIe adapters to function as though they are on
a non-UEFI server. Many of the advanced memory addressing features of the UEFI
environment will not be available to the OS in this mode.
Booting the server to an OS in this mode allows you the ability to apply firmware updates to a
Gen1 adapter that it not recognized in an UEFI environment.
To enable this feature from within F1-Setup, select Boot Manager Add Boot Option,
scroll down until Legacy Only is displayed in the list of options, and select it, as shown in
Figure 7-17 on page 320. If Legacy Only is not listed, it has already been added to the boot
manager.
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