Motorola MVME3100 User Manual
Chapter 3 MOTLoad Firmware
MVME3100 Single-Board Computer Installation and Use (V3100A/IH1)
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Alternate Boot Images and Safe Start
Some later versions of MOTLoad support Alternate Boot Images and a Safe Start recovery
procedure. If Safe Start is available on the MVME3100, Alternate Boot Images are supported.
With Alternate Boot Image support, the bootloader code in the boot block examines the upper
8MB of the flash bank for Alternate Boot images. If an image is found, control is passed to the
image.
procedure. If Safe Start is available on the MVME3100, Alternate Boot Images are supported.
With Alternate Boot Image support, the bootloader code in the boot block examines the upper
8MB of the flash bank for Alternate Boot images. If an image is found, control is passed to the
image.
Firmware Startup Sequence Following Reset
The firmware startup sequence following reset of MOTLoad is to:
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Initialize cache, MMU, FPU, and other CPU internal items
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Initialize the memory controller
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Search the active flash bank, possibly interactively, for a valid POST image. If found, the
POST images executes. Once completed, the POST image returns and startup continues.
POST images executes. Once completed, the POST image returns and startup continues.
■
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.
the USER boot image executes. A return to the boot block code is not anticipated.
■
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.
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.
■
Execute the recovery image of the firmware in the boot block if no valid USER or alternate
MOTLoad image is found
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.
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.