IBM 6400-I15 Maintenance Manual - Page 154
State, Description, Check Security PAL and NVRAM, Test for Powerup File, Automatic EC Update
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State Description 0000 Power up 0001 Enter checksum calculation 0002 Enter copy download code from FLASH into shared DRAM 0003 Enter programming FLASH mode 0004 Erase EC FLASH 0005 Program FLASH 0006 Finish programming FLASH 0007 Enter initialization of EC serial debug 0008 Enter EC firmware task initializations 0009 Enter power up coil diagnostic 000A Start running normal EC firmware ♦ Check Security PAL and NVRAM - The chip select for NVRAM comes from the security PAL. If the PAL is not installed, NVRAM cannot be accessed, so the PAL is tested before NVRAM. If the security PAL is not detected, boot codes displays "ERROR: SECURITY PAL NOT DETECTED". If a security PAL is detected, boot code checks for the presence of NVRAM. If NVRAM is not found, boot code displays "ERROR: NVRAM FAILURE". ♦ Test for Powerup File - Boot code checks for a DC executable file called powerup.sbr. If found, it executes the file, then returns to boot routines. If the file is not found, boot routines are resumed. If any key was held down during power up, boot code does not look for the powerup file and continues the boot sequence. ♦ Automatic EC Update - Boot code checks whether the automatic EC update feature is enabled by the DC program. If so, it looks for a copy of the EC program in the Flash File System. If it has a copy, it compares the program in EC flash to the program in the Flash File System, and updates the EC program if they are different. If the automatic EC update was not enabled, or if any key was held down during power up, automatic EC update is skipped and the boot sequence continues normally. 154 Troubleshooting
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