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MVME7100 Single Board Computer Installation and Use (6806800E08A)
MOTLoad Firmware Startup Sequence
98
Safe Start, whether invoked by hitting ESC on the console within the first five seconds following
power-on reset or by setting the Safe Start jumper, interrupts the scan process. The user may
then display the available boot images and select the desired image. The feature is provided to
enable recovery in cases when the programmed Alternate Boot Image is no longer desired. The
following output is an example of an interactive Safe Start:
ABCDEInteractive Boot Mode Entered
boot> ?
Interactive boot commands:
'd':show directory of alternate boot images
'c':continue with normal startup
'q':quit without executing any alternate boot image
'r [address]':execute specified (or default) alternate image
'p [address]':execute specified (or default) POST image
'?':this help screen
'h':this help screen
boot> d
Addr FFE00000 Size 00100000 Flags 00000003 Name: MOTLoad
Addr FFD00000 Size 00100000 Flags 00000003 Name: MOTLoad
boot> c
NOPQRSTUVabcdefghijk#lmn3opqrsstuvxyzaWXZ
Copyright Motorola Inc. 1999-2004, All Rights Reserved
MOTLoad RTOS Version 2.0, PAL Version 0.b EA02
...
MVME7100>
6.8 Startup Sequence
The firmware startup sequence following reset of MOTLoad is to:
z Initialize cache, MMU, FPU, and other CPU internal items
z Initialize the memory controller
z Search the active flash bank, possibly interactively, for a valid Power On Self Test (POST)
image. If found, the POST images executes. Once completed, the POST image returns and
startup continues.
z Search the active flash bank, possibly interactively, for a valid USER boot image. If found,
the USER boot image executes. A return to the boot block code is not anticipated.
z If a valid USER boot image is not found, search the active flash bank, possibly interactively,
for a valid Alternate MOTLoad boot image; anticipated to be an upgrade of alternate
MOTLoad firmware. If found, the image is executed. A return to the boot block code is not
anticipated.
z Execute the recovery image of the firmware in the boot block if no valid USER or alternate
MOTLoad image is found
During startup, interactive mode may be entered by either setting the Safe Start jumper/switch
or by sending an <ESC> to the console serial port within five seconds of the board reset. During
interactive mode, the user has the option to display locations at which valid boot images were
discovered, specify which discovered image is to be executed, or specify that the recovery
image in the boot block of the active flash bank is to be executed.