Kontron COMe-mTT10 - Manual (Page 60)

COMe-mTT10 / BIOS Operation
PCI Express Settings
Feature Options Description
Relaxed Ordering Disabled
Enabled
Enables or Disables PCI Express Device Relaxed Ordering
Extended Tag Disabled
Enabled
If Enabled allows device to use 8-bit Tag field as a
requester
No Snoop Disabled
Enabled Enables or Disables PCI Express Device No Snoop option
Maximum Payload Auto
128 … 4096 Bytes
Set Maximum Payload of PCI Express Device or allow
System BIOS to select the value
Maximum Read Request Auto
128 … 4096 Bytes
Set Maximum Read Request Size of PCI Express Device or
allow System BIOS to select the value
ASPM Support Disabled
Auto
Force L0s
Set the ASPM Level: Force L0s - Force all links to L0s
State. Auto - BIOS auto configure. Disable - Disables
ASPM
Extended Sync Disabled
Enabled
If Enabled allows generation of Extended
Synchronization patterns
Link Training Retry Disabled
2
3
5
Defines number of Retry Attepmts software will take to
retrain the link if previous training attempt was
unsuccessful
Link Training Timeout (uS) 100 Defines number of Microseconds software will wait
before polling 'Link Training' bit in Link Status register.
Value range from 1 to 100uS
Unpopulated Links Keep Link ON
Disable Link
In order to save power, sofware will disable
unpopulated PCI Express links, if this option set to
'Disable Link'
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