Kontron VMP1 - Manual (Page 70)

VMP1 Bootstrap Loader
ID 19972, Rev. 0101 Page 5 - 4 ® PEP Modular Computers GmbH
5.1.2 Entering the Command Mode
There are two possible reasons for entering the Bootstrap Loader command mode:
• If no valid start key is found, the Bootstrap Loader command mode is entered auto-
matically.
• If the user wants to enter the Bootstrap Loader manually, e.g. for re-programming
the Flash contents, the ABORT button on the front panel must be used.
CTRL-x deletes the complete input line while CTRL-a restores the last input line on the
command I/F.
5.1.3 Programming a New Binary Image to Flash Memory
Preparing the Image
The image must be compiled / linked to run from the Flash base address 0x0 of the
CPU. The image must contain executable PPC code at offset 0x100, as is usual for
ROM/Flash images.
A binary image must be converted to Motorola S-records or loaded to a VME memory
board with battery backup, Flash or EPROM population.
$ $ Important!
The ABORT button must not be pushed until the green LED is
lit, because this button generates an NMI, and the exception
vector tables must be initialized correctly to serve this NMI.
However, the ABORT button must be pushed before the green
LED stops flashing (BootWaitTime), since the system control
is transferred to the downloaded binary image afterwards. The
LED is cycled every 0.25 sec. so if 1 second is specified as
BootWaitTime, the LED will only flash twice.