Hotplugging PCIe EM Card Fails When Replacing the Original Card With One of a Different Type (CR 7003634)
Hotplugging PCIe EM Card Fails When Replacing the
Original Card With One of a Different Type (CR 7003634)
When you remove a PCIe ExpressModule (EM) card and replace it by hotplugging a card of
a different type, the OS might not be able to configure the new card. This is because before
booting to the OS, the BIOS allocates resources based on the card's requirements during POST.
If the new card requires more resources than the original, the OS does not have the ability to
allocate more resources to the new card at this time, and the card does not operate correctly.
Workaround 1
Hotplug PCIe EM cards in previously empty slots.
Workaround 2
If a hotplugged PCIe EM card fails to operate correctly, reboot the server.
Messages Complain of Failure to Allocate I/O Resources
(CR 6984329)
Messages that complain about failures to allocate I/O resources might appear in POST, and in
log files.
For example, you might see:
Sep 8 15:50:49 nsg14-28 kernel: PCI: Failed to allocate I/O resource
#2:20@0 for 0000:8d:00.0
Sep 8 15:50:49 nsg14-28 kernel: PCI: Failed to allocate I/O resource
#2:20@0 for 0000:8d:00.1
Workaround
BIOS tries to allocate I/O resources. If it is unable to allocate I/O resources successfully, it
displays error messages.
The OS might try as well. However if it tries, it fails and generates additional failure messages
because it uses the same method as BIOS. However, most drivers can manage this condition.
Usually, you can ignore these messages.
If you continue to experience I/O resource issues, see I/O and Interrupt Resource Allocation in
Sun Fire X4800 Server Installation Guide.
90 Sun Fire X4800 Server Product Notes • July 2017
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