Debug Display; Tpm Physical Presence Pin; Ground Test Points - Congatec conga-CEVAL User Manual

5.3

Debug Display

During the POST (Power On Self Test), the BIOS generates diagnostic progress codes (POST-codes) to different I/O ports (usually port 80h).
If the POST fails, execution stops and the last POST code generated is left at the respective port. This code is useful for determining the point
where an error occurred.
The conga-CEVAL decodes these ports and displays their contents on 4 seven-segment displays (D48 to D51). The dots in the first two
displays show the state of the Reset and the PCI Frame signals. A list of the POST codes and associated POST test and initialization routines
for the BIOS used on congatec COM Express™ modules is available at www.congatec.com.
The DIP Switch M45 is used for port selection.
DIP Switch M45
SW1 On
SW1 Off
SW2 On
SW2 Off
5.4

TPM Physical Presence Pin

The conga‑CEVAL rev C.X provides an assembly option (R199) to enable the TPM physical presence feature of the COM Express module. The
R199 when populated, pulls the COM Express module pin C83 high, thereby enabling the TPM physical presence feature.
5.5

Ground Test Points

The conga‑CEVAL provides 4 test points that are connected to Ground Potential (M3, M6, M15, and M16). These test
points make it easier to connect oscilloscope probes and/or multimeter lines to Ground when performing measurements
on the COM Express™ module.
Copyright © 2012 congatec AG
Reset
Configuration
PCI POST (default)
LPC POST
POST ADDR 80h/84h (default)
POST ADDR 90h/94h
Port 80/90
PCI Frame
Port 84/90/94
CEVA_c_m10
DIP SWITCH
(M45)
ON
1 2
Test Points
(TP)
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