Kontron AM4100, Руководство пользователя

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AM4100 NetBootLoader
ID 36126, Rev. 2.0 Page 5 - 11
P R E L I M I N A R Y
5.4.3.9 SQ
This command is used to set or display the order in which images are to be booted.
The NetBootLoader provides the capability to program up to four images into the NBL Flash
memory. With this command the operator can define the order in which images may be used
when the system is booted. This provides operational flexibility as well as the possibility for the
system to compensate for a defective image.
For example, in the event the first image specified is defect, the NetBootLoader will attempt to
load the next image specified. This is continued until either a valid image is loaded or no further
image is available.
If no valid image is found, the NetBootLoader remains available for inputs.
5.4.4 telnet Login
A telnet login to the NetBootLoader is only possible during the boot wait time or when the boot
operation has been terminated either by operator action or automatically by the NetBootLoad-
er. In either case, the Ethernet port parameters and the telnet password must be set prior to
attempting the telnet login.
To effect a telnet login the operator performs the standard telnet login procedure. The NetBoot-
Loader responds by requesting a login password. The operator then enters a password. If the
password is valid, the operator can now access the NetBootLoader. If the password is invalid,
the telnet login procedure is terminated and the boot operation continues.
In the case of an invalid password, the login procedure may be repeated as often as required
within the boot wait time or as long as the AM4100 telnet server is active after the boot wait
time has been exceeded. Once the AM4100 telnet server is terminated, a telnet login is no lon-
ger possible.
5.4.5 NBL Flash Operations
To achieve an operable system for an application, the application software may be pro-
grammed to NBL Flash memory. As mentioned before, the NetBootLoader supports the pro-
gramming of up to four images to NBL Flash memory whereby each image is assigned its own
image number. In addition to this, it also supports the updating of the NetBootLoader itself as
well as data transfer from the NBL Flash memory to the data buffer and from the data buffer to
an FTP server. The following chapters provide information on performing the various types of
NBL Flash memory operations.
5.4.5.1 NBL Flash Offsets
The currently used NBL Flash memory is one uniform Flash memory. All offsets are based from
the beginning of this Flash memory area. The NetBootLoader itself is located at the beginning
of the NBL Flash memory area and for this reason this area cannot be used for other image
programming. To display an overview of the currently used NBL Flash memory organization
use the INFO command.