Kontron AM4211 - Manual (Page 56)

41 AM4211
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Table 5-11: Bootloader environment variables
Name Type Description
boardmacaddr Var
Contains the default base MAC address for the OCTEON 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!
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
kernel_rootfs_update Script
Command script to flash a binary image transferred with tftpboot to the active
image flash partition kernel_rootfs
kernel_rootfs_backup_update Script
Command script to flash a binary image transferred with tftpboot to the backup
image flash partition kernel_rootfs_backup
disable_kcs Var
yes – completely disable all IPMI KCS access from bootloader
- use KCS interface to retrieve MAC address and program watchdog et al
(default)
ethact Var
Default network interface used by network commands (bootp, tftpboot)
default: octmgmt0
linuxcores Var
Contains the number of CPU cores to allocate to the Linux kernel booted by the
default boot commands
default: 10
linuxmem Var
Contains the amount of RAM in MB to allocate for the Linux kernel booted by the
default boot comands
default: 2048 (with a 2 Gig) 4096 (with a 4 Gig)
loadaddr Var
Default load address for network transfers. This is used as a temporary storage for
netbooting and firmware updates.
default: 0x20000000
netretry Var
– retry a failed netboot command infinitely with the interface defined by
‘ethact’ environment variable.
no – do not retry failed net boot commands (bootp, tftpboot et al) using all
available interfaces (default)
yes – retry a failed netboot command by iterating through all available interfaces
nuke_user_jffs2 Script
Command script that erases the active image partition of the onboard flash
partition user_jffs2
nuke_user_jffs2_backup Script
Command script that erases the backup image partition of the onboard flash
partition user_jffs2_backup
uboot_backup_update Script
Command script to flash a U-Boot binary image transferred with tftpboot to the
backup image bootloader
uboot_update /
bootloaderupdate
Script
Command script to flash a U-Boot binary image transferred with tftpboot to the
active image bootloader
watchdogboot Var
0 – disable boot monitor watchdog (default)
5...n – timeout in seconds before boot monitor watchdog fires
Note: This is the pBMWD watchdog