+# SPDX-License-Identifier: GPL-2.0+
#
# (C) Copyright 2000 - 2013
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
-#
-# SPDX-License-Identifier: GPL-2.0+
-#
Summary:
========
- Board Type: Define exactly one, e.g. CONFIG_MPC8540ADS.
-- Marvell Family Member
- CONFIG_SYS_MVFS - define it if you want to enable
- multiple fs option at one time
- for marvell soc family
-
- 85xx CPU Options:
CONFIG_SYS_PPC64
as a convenience, when switching between booting from
RAM and NFS.
-- Bootcount:
- CONFIG_BOOTCOUNT_LIMIT
- Implements a mechanism for detecting a repeating reboot
- cycle, see:
- http://www.denx.de/wiki/view/DULG/UBootBootCountLimit
-
- CONFIG_BOOTCOUNT_ENV
- If no softreset save registers are found on the hardware
- "bootcount" is stored in the environment. To prevent a
- saveenv on all reboots, the environment variable
- "upgrade_available" is used. If "upgrade_available" is
- 0, "bootcount" is always 0, if "upgrade_available" is
- 1 "bootcount" is incremented in the environment.
- So the Userspace Applikation must set the "upgrade_available"
- and "bootcount" variable to 0, if a boot was successfully.
-
- Pre-Boot Commands:
CONFIG_PREBOOT
CONFIG_AT91_HW_WDT_TIMEOUT
specify the timeout in seconds. default 2 seconds.
-- U-Boot Version:
- CONFIG_VERSION_VARIABLE
- If this variable is defined, an environment variable
- named "ver" is created by U-Boot showing the U-Boot
- version as printed by the "version" command.
- Any change to this variable will be reverted at the
- next reset.
-
- Real-Time Clock:
When CONFIG_CMD_DATE is selected, the type of the RTC
CONFIG_EFI_PARTITION GPT partition table, common when EFI is the
bootloader. Note 2TB partition limit; see
disk/part_efi.c
- CONFIG_MTD_PARTITIONS Memory Technology Device partition table.
-
- If IDE or SCSI support is enabled (CONFIG_IDE or
CONFIG_SCSI) you must configure support for at
least one non-MTD partition type as well.
CONFIG_SUPPORT_EMMC_BOOT
Enable some additional features of the eMMC boot partitions.
- CONFIG_SUPPORT_EMMC_RPMB
- Enable the commands for reading, writing and programming the
- key for the Replay Protection Memory Block partition in eMMC.
-
- USB Device Firmware Update (DFU) class support:
- CONFIG_USB_FUNCTION_DFU
+ CONFIG_DFU_OVER_USB
This enables the USB portion of the DFU USB class
CONFIG_DFU_MMC
be at least 4MB.
- MII/PHY support:
- CONFIG_PHY_ADDR
-
- The address of PHY on MII bus.
-
CONFIG_PHY_CLOCK_FREQ (ppc4xx)
The clock frequency of the MII bus
You can fine tune the DHCP functionality by defining
CONFIG_BOOTP_* symbols:
- CONFIG_BOOTP_SUBNETMASK
- CONFIG_BOOTP_GATEWAY
- CONFIG_BOOTP_HOSTNAME
CONFIG_BOOTP_NISDOMAIN
- CONFIG_BOOTP_BOOTPATH
CONFIG_BOOTP_BOOTFILESIZE
- CONFIG_BOOTP_DNS
- CONFIG_BOOTP_DNS2
CONFIG_BOOTP_SEND_HOSTNAME
CONFIG_BOOTP_NTPSERVER
CONFIG_BOOTP_TIMEOFFSET
to Link-local IP address configuration if the DHCP server
is not available.
- CONFIG_BOOTP_DNS2 - If a DHCP client requests the DNS
- serverip from a DHCP server, it is possible that more
- than one DNS serverip is offered to the client.
- If CONFIG_BOOTP_DNS2 is enabled, the secondary DNS
- serverip will be stored in the additional environment
- variable "dnsip2". The first DNS serverip is always
- stored in the variable "dnsip", when CONFIG_BOOTP_DNS
- is defined.
-
CONFIG_BOOTP_SEND_HOSTNAME - Some DHCP servers are capable
to do a dynamic update of a DNS server. To do this, they
need the hostname of the DHCP requester.
#define CONFIG_NFS_TIMEOUT 10000UL
- Command Interpreter:
- CONFIG_AUTO_COMPLETE
-
- Enable auto completion of commands using TAB.
-
CONFIG_SYS_PROMPT_HUSH_PS2
This defines the secondary prompt string, which is
symbols.
- Command Line Editing and History:
- CONFIG_CMDLINE_EDITING
-
- Enable editing and History functions for interactive
- command line input operations
-
-- Command Line PS1/PS2 support:
CONFIG_CMDLINE_PS_SUPPORT
Enable support for changing the command prompt string
the environment like the "source" command or the
boot command first.
- CONFIG_ENV_VARS_UBOOT_CONFIG
-
- Define this in order to add variables describing the
- U-Boot build configuration to the default environment.
- These will be named arch, cpu, board, vendor, and soc.
-
- Enabling this option will cause the following to be defined:
-
- - CONFIG_SYS_ARCH
- - CONFIG_SYS_CPU
- - CONFIG_SYS_BOARD
- - CONFIG_SYS_VENDOR
- - CONFIG_SYS_SOC
-
- CONFIG_ENV_VARS_UBOOT_RUNTIME_CONFIG
-
- Define this in order to add variables describing certain
- run-time determined information about the hardware to the
- environment. These will be named board_name, board_rev.
-
CONFIG_DELAY_ENVIRONMENT
Normally the environment is loaded when the board is
A better solution is to properly configure the firewall,
but sometimes that is not allowed.
-- bootcount support:
- CONFIG_BOOTCOUNT_LIMIT
-
- This enables the bootcounter support, see:
- http://www.denx.de/wiki/DULG/UBootBootCountLimit
-
- CONFIG_AT91SAM9XE
- enable special bootcounter support on at91sam9xe based boards.
- CONFIG_SOC_DA8XX
- enable special bootcounter support on da850 based boards.
- CONFIG_BOOTCOUNT_RAM
- enable support for the bootcounter in RAM
- CONFIG_BOOTCOUNT_I2C
- enable support for the bootcounter on an i2c (like RTC) device.
- CONFIG_SYS_I2C_RTC_ADDR = i2c chip address
- CONFIG_SYS_BOOTCOUNT_ADDR = i2c addr which is used for
- the bootcounter.
- CONFIG_BOOTCOUNT_ALEN = address len
- CONFIG_BOOTCOUNT_EXT
- enable support for the bootcounter in EXT filesystem
- CONFIG_SYS_BOOTCOUNT_ADDR = RAM address used for read
- and write.
- CONFIG_SYS_BOOTCOUNT_EXT_INTERFACE = interface
- CONFIG_SYS_BOOTCOUNT_EXT_DEVPART = device and part
- CONFIG_SYS_BOOTCOUNT_EXT_NAME = filename
-
- Show boot progress:
CONFIG_SHOW_BOOT_PROGRESS
-150 common/cmd_nand.c Incorrect FIT image format
151 common/cmd_nand.c FIT image format OK
-- legacy image format:
- CONFIG_IMAGE_FORMAT_LEGACY
- enables the legacy image format support in U-Boot.
-
- Default:
- enabled if CONFIG_FIT_SIGNATURE is not defined.
-
- CONFIG_DISABLE_IMAGE_LEGACY
- disable the legacy image format
-
- This define is introduced, as the legacy image format is
- enabled per default for backward compatibility.
-
- Standalone program support:
CONFIG_STANDALONE_LOAD_ADDR
for a more detailed description refer to doc/README.update.
- MTD Support (mtdparts command, UBI support)
- CONFIG_MTD_DEVICE
-
- Adds the MTD device infrastructure from the Linux kernel.
- Needed for mtdparts command support.
-
- CONFIG_MTD_PARTITIONS
-
- Adds the MTD partitioning infrastructure from the Linux
- kernel. Needed for UBI support.
-
-- UBI support
- CONFIG_UBI_SILENCE_MSG
-
- Make the verbose messages from UBI stop printing. This leaves
- warnings and errors enabled.
-
-
CONFIG_MTD_UBI_WL_THRESHOLD
This parameter defines the maximum difference between the highest
erase counter value and the lowest erase counter value of eraseblocks
Enable UBI fastmap debug
default: 0
-- UBIFS support
- CONFIG_UBIFS_SILENCE_MSG
-
- Make the verbose messages from UBIFS stop printing. This leaves
- warnings and errors enabled.
-
- SPL framework
CONFIG_SPL
Enable building of SPL globally.
CONFIG_SYS_SPL_MALLOC_SIZE
The size of the malloc pool used in SPL.
- CONFIG_SPL_FRAMEWORK
- Enable the SPL framework under common/. This framework
- supports MMC, NAND and YMODEM loading of U-Boot and NAND
- NAND loading of the Linux Kernel.
-
CONFIG_SPL_OS_BOOT
Enable booting directly to an OS from SPL.
See also: doc/README.falcon
CONFIG_SPL_NAND_DRIVERS
SPL uses normal NAND drivers, not minimal drivers.
+ CONFIG_SPL_NAND_IDENT
+ SPL uses the chip ID list to identify the NAND flash.
+ Requires CONFIG_SPL_NAND_BASE.
+
CONFIG_SPL_NAND_ECC
Include standard software ECC in the SPL
use an arch-specific makefile fragment instead, for
example if more than one image needs to be produced.
- CONFIG_FIT_SPL_PRINT
+ CONFIG_SPL_FIT_PRINT
Printing information about a FIT image adds quite a bit of
code to SPL. So this is normally disabled in SPL. Use this
option to re-enable it. This will affect the output of the
Begin and End addresses of the area used by the
simple memory test.
-- CONFIG_SYS_ALT_MEMTEST:
- Enable an alternate, more extensive memory test.
-
- CONFIG_SYS_MEMTEST_SCRATCH:
Scratch address used by the alternate memory test
You only need to set this if address zero isn't writeable
If defined, the x86 reset vector code is included. This is not
needed when U-Boot is running from Coreboot.
-- CONFIG_SPL_AM33XX_ENABLE_RTC32K_OSC:
- Enables the RTC32K OSC on AM33xx based plattforms
-
- CONFIG_SYS_NAND_NO_SUBPAGE_WRITE
Option to disable subpage write in NAND driver
driver that uses this:
regular expression. This allows multiple variables to be connected to
the same callback without explicitly listing them all out.
+The signature of the callback functions is:
+
+ int callback(const char *name, const char *value, enum env_op op, int flags)
+
+* name - changed environment variable
+* value - new value of the environment variable
+* op - operation (create, overwrite, or delete)
+* flags - attributes of the environment variable change, see flags H_* in
+ include/search.h
+
+The return value is 0 if the variable change is accepted and 1 otherwise.
Command Line Parsing:
=====================