Kontron AT8242 - Manual (Page 89)

Software Setup
73 AT8242
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# setenv ddr_clock_hertz 666666666
Will configure the DDR clock at 666Mhz, the data rate will be 1333Mhz.
2 - Configuring the memory window used in Linux environment:
# setenv linuxmem [SIZE]
[SIZE] = size of memory in megabytes, here is an example:
# setenv linuxmem 2048M
This will configure a memory window of 2GB for Embedded Linux.
5.1.1.6 Bootloader Environment Variables Specific to the AT8242
This table represents the u-boot environment variable specific for the AT8242:
Variables Descriptions
frucontrol_cr Cold reset the Cavium NPU.
boot_user Select current boot image to user bank, reboot NPU.
boot_factory Select current boot image to recovery bank, reboot NPU.
boardmacaddr Current base MAC address (DO NOT CHANGE)
bootcmd Command definition for booting linux from flash.
bootdelay Delay before running “bootcmd”..
ethact Network device used by U-Boot for network access.
bootloader_backup_update Commands for updating U-boot in backup bank.
kernel_rootfs_backup_update Commands for updating Embedded Linux and filesystem in backup bank.
kernel_rootfs_update Commands for updating Embedded Linux and filesystem in active bank.
linuxcores Number of Processor core(s) to be used in embedded linux.
linuxmem Size of memory window to be used by embedded linux.
mtdparts Logical Flash partitions definition.
erase_bootloader_backup Erase backup boot loader.
erase_env Erase active environment variables.
erase_env_backup Erase backup environment variables.
erase_kernel_rootfs Erase Embedded Linux and filesystem in active bank.
erase_kernel_rootfs_backup Erase Embedded Linux and filesystem in backup bank.
pbmwd_timeout Timeout until watchdog bite for U-boot loading.
poswd_timeout Timeout until watchdog bite for Embedded Linux loading.
poswdsetup Command to configure IPMI watchdog modes.