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In this procedure, both the main and backup image lists have feature and patch images. If an image
list does not have either feature images or patch images, the system starts up with the main boot and
system images after they pass verification.
If both the main and backup boot images are nonexistent or invalid, connect to the console port, and
power cycle the device to load a boot image from the Boot ROM menu. For more information about
downloading and loading a boot image, see the release notes for the software version.
Figure 31 Comware image loading procedure
System startup process
Upon power-on, the Boot ROM image runs to initialize hardware, and then the startup software
images run to start up the entire system, as shown in Figure 32.
Main boot image exists
and valid?
Start
Backup boot image
exists and valid?
No
No
Start up from the Boot menu
Main system image
exists and valid?
Backup system image
exists and valid?
No No
Start up with main boot
image and access the
emergency shell
Yes Yes
All main feature images
exist and valid?
All backup feature
images exist and valid?
No No
All patch images exist
and valid?
All backup patch images
exist and valid?
No No
Yes Yes
Yes
Yes
Yes Yes
Start up with main images Start up with backup images
Main boot image exists
and valid?
No
Yes
Start up with backup boot
image and access the
emergency shell
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