Power On Self Test; Table 4-1: Post Tests; Table 4-2: Post Routines And Error Codes - Kontron CP6924-1 User Manual

4.3.1

Power On Self Test

4.3.1.1 Test Routines
Upon power on or system reset, the bootloader performs the following power on self tests (POST):
Table 4-1:
POST tests
Test
Serial
I2C
PCI Express
Serviceport
Bootloader environment
VPD area
DDR RAM data/address lines Data/address line test. Checks for stucked or shortened data/address
DDR RAM memory cells
Cache
KCS
The POST result is stored in the transient environment variable 'postresult'. If no POST error occurred, postresult is set to
'0', otherwise - depending on the actual POST error - postresult is set as shown in table 4-2 below.
The 'postresult' value is passed to the linux kernel by means of the 'bootargs' environment variable.
The following table shows the POST code values written into the 'postresult' environment variable.
Table 4-2:
POST routines and error codes
Device
0x00 All POST were successful
0x01 Serial POST failed
0x02 I2C POST failed
0x04 PCIe POST failed
0x08 Ethernet POST failed
0x10 Bootloader environment POST failed
0x20 VPD POST failed
0x40 Memory data/address line POST failed
0x80 Memory device cells POST failed
0x100 CPU cache POST failed
0x200 KCS POST failed
55
Description
Onboard Unit Computer serial controller loopback test
Check for presence of onboard I2C devices
Check for PCI Express switch device presence
Onboard PPC405EX ethernet internal loopback test
Check for valid bootloader environment (CRC correct or both CRCs are
0xFFFFFFFF == not initialized)
Check for valid VPD area (CRC is valid)
lines
Checkerboard standard test algorithm
PPC405EX data and instruction cache
KCS Interface communication
Test
CP6924-1 User Guide
www.kontron.com