Kontron AM4220 - Manual (Page 63)

48 AM4220
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Table 5-10:Bootloader POST Code values
5.2.2 Bootloader shell and options
The boot process can be interrupted by entering the bootstopkey phrase “stop”. This will open a bootloader
command line interface.
Entering “?” provides a list of possible built-in commands, “printenv” provides a list of current environment
settings. The bootloader shell can be used to customize boot options and system startup by changing some of
its environment variables. A list of available environment variables and its description can be seen in the
table below.
Table 5-11: Bootloader environment variables
POST Code Value Description
0x00 All POST were successful
0x10 Cavium BIST failed
0x20 Memory data line POST failed
0x40 Memory address line POST failed
0x80 Memory device cells POST failed
Name Type Description
boardmacaddr Var
Contains the default base MAC address for the Octeon plus Ethernet interfaces. This
variable is automatically set by the bootloader when the MAC address was read from
the MMC/KCS interfaces. This should only be set manually when disable_kcs=yes or
ignore_kcserr=yes to provide a “fallback” MAC address, when the KCS/MMC
interface is not available or fails
bootcmd Script
This variable defines a command string that is automatically executed when the
initial countdown is not interrupted.
This command is only executed when the variable bootdelay is also defined!
bootcmddata0a Script
Contains the standard startup script for loading OS image from flash partition
mtd4, which is a raw partition. The image is started using bootoctlinux command.
bootcmddata0b Script
Contains the standard startup script for loading OS image from flash partition
mtd5, which is a JFFS2 partition by default. The image is started using a
combination of fsload/bootoctlinux command.
bootcmdnet Script Contains the standard startup script for loading OS image from network
bootcmdprd Script Contains the standard startup script for use during board production
bootdelay Var
After reset, U-Boot will wait this number of seconds before it executes the
contents of the bootcmd variable. If the bootstopkey phrase is typed
during this time, the bootloader command line interface is entered.
Set this variable to 0 boots without delay. Be careful: depending on the
contents of your bootcmd variable, this can prevent you from entering
interactive commands again forever!
Set this variable to -1 to disable autoboot.
default: 5 for flash based bootloader, -1 for RAM resident bootloader
bootsource Var
When the standard boot sequence is used, contains the boot source, either data0a,
data0b, net, prd to select the respective boot sequence to activate. It is only used
when bootcmd contains the default startup script, which may be overridden by the
user.
default: data0a