=========================
The U-Boot source code is maintained in the Git repository at
-https://gitlab.denx.de/u-boot/u-boot.git ; you can browse it online at
-https://gitlab.denx.de/u-boot/u-boot
+https://source.denx.de/u-boot/u-boot.git ; you can browse it online at
+https://source.denx.de/u-boot/u-boot
The "Tags" links on this page allow you to download tarballs of
any version you might be interested in. Official releases are also
Directory Hierarchy:
====================
-/arch Architecture specific files
+/arch Architecture-specific files
/arc Files generic to ARC architecture
/arm Files generic to ARM architecture
/m68k Files generic to m68k architecture
/sh Files generic to SH architecture
/x86 Files generic to x86 architecture
/xtensa Files generic to Xtensa architecture
-/api Machine/arch independent API for external apps
-/board Board dependent files
+/api Machine/arch-independent API for external apps
+/board Board-dependent files
/cmd U-Boot commands functions
-/common Misc architecture independent functions
+/common Misc architecture-independent functions
/configs Board default configuration files
/disk Code for disk drive partition handling
-/doc Documentation (don't expect too much)
-/drivers Commonly used device drivers
-/dts Contains Makefile for building internal U-Boot fdt.
-/env Environment files
+/doc Documentation (a mix of ReST and READMEs)
+/drivers Device drivers
+/dts Makefile for building internal U-Boot fdt.
+/env Environment support
/examples Example code for standalone applications, etc.
/fs Filesystem code (cramfs, ext2, jffs2, etc.)
/include Header Files
/post Power On Self Test
/scripts Various build scripts and Makefiles
/test Various unit test files
-/tools Tools to build S-Record or U-Boot images, etc.
+/tools Tools to build and sign FIT images, etc.
Software Configuration:
=======================
CONFIG_SYS_FSL_DDR
Freescale DDR driver in use. This type of DDR controller is
- found in mpc83xx, mpc85xx, mpc86xx as well as some ARM core
- SoCs.
+ found in mpc83xx, mpc85xx as well as some ARM core SoCs.
CONFIG_SYS_FSL_DDR_ADDR
Freescale DDR memory-mapped register base.
* The bootm command automatically updates the fdt
OF_TBCLK - The timebase frequency.
- OF_STDOUT_PATH - The path to the console device
boards with QUICC Engines require OF_QE to set UCC MAC
addresses
controller register space
- Serial Ports:
- CONFIG_PL010_SERIAL
-
- Define this if you want support for Amba PrimeCell PL010 UARTs.
-
CONFIG_PL011_SERIAL
Define this if you want support for Amba PrimeCell PL011 UARTs.
SoC, then define this variable and provide board
specific code for the "hw_watchdog_reset" function.
+ CONFIG_SYS_WATCHDOG_FREQ
+ Some platforms automatically call WATCHDOG_RESET()
+ from the timer interrupt handler every
+ CONFIG_SYS_WATCHDOG_FREQ interrupts. If not set by the
+ board configuration file, a default of CONFIG_SYS_HZ/2
+ (i.e. 500) is used. Setting CONFIG_SYS_WATCHDOG_FREQ
+ to 0 disables calling WATCHDOG_RESET() from the timer
+ interrupt.
+
- Real-Time Clock:
When CONFIG_CMD_DATE is selected, the type of the RTC
In such cases CONFIG_GPIO_LED_INVERTED_TABLE may be defined
with a list of GPIO LEDs that have inverted polarity.
-- I2C Support: CONFIG_SYS_I2C
+- I2C Support: CONFIG_SYS_I2C_LEGACY
- This enable the NEW i2c subsystem, and will allow you to use
+ Note: This is deprecated in favour of driver model. Use
+ CONFIG_DM_I2C instead.
+
+ This enable the legacy i2c subsystem, and will allow you to use
i2c commands at the u-boot command line (as long as you set
CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
for defining speed and slave address
CONFIG_SYS_OR3_PRELIM, CONFIG_SYS_BR3_PRELIM:
Memory Controller Definitions: BR2/3 and OR2/3 (SDRAM)
-- CONFIG_PCI_ENUM_ONLY
- Only scan through and get the devices on the buses.
- Don't do any setup work, presumably because someone or
- something has already done it, and we don't need to do it
- a second time. Useful for platforms that are pre-booted
- by coreboot or similar.
-
-- CONFIG_PCI_INDIRECT_BRIDGE:
- Enable support for indirect PCI bridges.
-
- CONFIG_SYS_SRIO:
Chip has SRIO or not
sspi - SPI utility commands
base - print or set address offset
printenv- print environment variables
+pwm - control pwm channels
setenv - set environment variables
saveenv - save environment variables to persistent storage
protect - enable or disable FLASH write protection
The return value is 0 if the variable change is accepted and 1 otherwise.
-Command Line Parsing:
-=====================
-
-There are two different command line parsers available with U-Boot:
-the old "simple" one, and the much more powerful "hush" shell:
-
-Old, simple command line parser:
---------------------------------
-
-- supports environment variables (through setenv / saveenv commands)
-- several commands on one line, separated by ';'
-- variable substitution using "... ${name} ..." syntax
-- special characters ('$', ';') can be escaped by prefixing with '\',
- for example:
- setenv bootcmd bootm \${address}
-- You can also escape text by enclosing in single apostrophes, for example:
- setenv addip 'setenv bootargs $bootargs ip=$ipaddr:$serverip:$gatewayip:$netmask:$hostname::off'
-
-Hush shell:
------------
-
-- similar to Bourne shell, with control structures like
- if...then...else...fi, for...do...done; while...do...done,
- until...do...done, ...
-- supports environment ("global") variables (through setenv / saveenv
- commands) and local shell variables (through standard shell syntax
- "name=value"); only environment variables can be used with "run"
- command
-
-General rules:
---------------
-
-(1) If a command line (or an environment variable executed by a "run"
- command) contains several commands separated by semicolon, and
- one of these commands fails, then the remaining commands will be
- executed anyway.
-
-(2) If you execute several variables with one call to run (i. e.
- calling run with a list of variables as arguments), any failing
- command will cause "run" to terminate, i. e. the remaining
- variables are not executed.
Note for Redundant Ethernet Interfaces:
=======================================
projects / platform / kernel / u-boot.git / blobdiff