as a convenience, when switching between booting from
RAM and NFS.
-- Pre-Boot Commands:
- CONFIG_PREBOOT
-
- When this option is #defined, the existence of the
- environment variable "preboot" will be checked
- immediately before starting the CONFIG_BOOTDELAY
- countdown and/or running the auto-boot command resp.
- entering interactive mode.
-
- This feature is especially useful when "preboot" is
- automatically generated or modified. For an example
- see the LWMON board specific code: here "preboot" is
- modified when the user holds down a certain
- combination of keys on the (special) keyboard when
- booting the systems
-
- Serial Download Echo Mode:
CONFIG_LOADS_ECHO
If defined to 1, all characters received during a
SoC, then define this variable and provide board
specific code for the "hw_watchdog_reset" function.
- CONFIG_AT91_HW_WDT_TIMEOUT
- specify the timeout in seconds. default 2 seconds.
-
- Real-Time Clock:
When CONFIG_CMD_DATE is selected, the type of the RTC
this is instead controlled by the value of
/config/load-environment.
-- Serial Flash support
- Usage requires an initial 'sf probe' to define the serial
- flash parameters, followed by read/write/erase/update
- commands.
-
- The following defaults may be provided by the platform
- to handle the common case when only a single serial
- flash is present on the system.
-
- CONFIG_SF_DEFAULT_BUS Bus identifier
- CONFIG_SF_DEFAULT_CS Chip-select
- CONFIG_SF_DEFAULT_MODE (see include/spi.h)
- CONFIG_SF_DEFAULT_SPEED in Hz
-
-
- TFTP Fixed UDP Port:
CONFIG_TFTP_PORT