such as ARM architectural timer initialization.
- Linux Kernel Interface:
- CONFIG_CLOCKS_IN_MHZ
-
- U-Boot stores all clock information in Hz
- internally. For binary compatibility with older Linux
- kernels (which expect the clocks passed in the
- bd_info data to be in MHz) the environment variable
- "clocks_in_mhz" can be defined so that U-Boot
- converts clock data to MHZ before passing it to the
- Linux kernel.
- When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
- "clocks_in_mhz=1" is automatically included in the
- default environment.
-
CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
When transferring memsize parameter to Linux, some versions
Define this variable to enable hw flow control in serial driver.
Current user of this option is drivers/serial/nsl16550.c driver
-- Console Baudrate:
- CONFIG_BAUDRATE - in bps
- Select one of the baudrates listed in
- CONFIG_SYS_BAUDRATE_TABLE, see below.
-
- Autoboot Command:
CONFIG_BOOTCOMMAND
Only needed when CONFIG_BOOTDELAY is enabled;
Allow generic access to the SPI bus on the Intel 8257x, for
example with the "sspi" command.
- CONFIG_EEPRO100
- Support for Intel 82557/82559/82559ER chips.
- Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
- write routine for first time initialisation.
-
- CONFIG_TULIP
- Support for Digital 2114x chips.
- Optional CONFIG_TULIP_SELECT_MEDIA for board specific
- modem chip initialisation (KS8761/QS6611).
-
CONFIG_NATSEMI
Support for National dp83815 chips.
can be displayed via the splashscreen support or the
bmp command.
-- Compression support:
- CONFIG_GZIP
-
- Enabled by default to support gzip compressed images.
-
- CONFIG_BZIP2
-
- If this option is set, support for bzip2 compressed
- images is included. If not, only uncompressed and gzip
- compressed images are supported.
-
- NOTE: the bzip2 algorithm requires a lot of RAM, so
- the malloc area (as defined by CONFIG_SYS_MALLOC_LEN) should
- be at least 4MB.
-
- MII/PHY support:
CONFIG_PHY_CLOCK_FREQ (ppc4xx)
This enable the NEW i2c subsystem, and will allow you to use
i2c commands at the u-boot command line (as long as you set
- CONFIG_CMD_I2C in CONFIG_COMMANDS) and communicate with i2c
- based realtime clock chips or other i2c devices. See
- common/cmd_i2c.c for a description of the command line
- interface.
-
- ported i2c driver to the new framework:
- - drivers/i2c/soft_i2c.c:
- - activate first bus with CONFIG_SYS_I2C_SOFT define
CONFIG_SYS_I2C_SOFT_SPEED and CONFIG_SYS_I2C_SOFT_SLAVE
for defining speed and slave address
- activate second bus with I2C_SOFT_DECLARATIONS2 define
- activate this driver with CONFIG_SYS_I2C_RCAR
- This driver adds 4 i2c buses
- - CONFIG_SYS_RCAR_I2C0_BASE for setting the register channel 0
- - CONFIG_SYS_RCAR_I2C0_SPEED for for the speed channel 0
- - CONFIG_SYS_RCAR_I2C1_BASE for setting the register channel 1
- - CONFIG_SYS_RCAR_I2C1_SPEED for for the speed channel 1
- - CONFIG_SYS_RCAR_I2C2_BASE for setting the register channel 2
- - CONFIG_SYS_RCAR_I2C2_SPEED for for the speed channel 2
- - CONFIG_SYS_RCAR_I2C3_BASE for setting the register channel 3
- - CONFIG_SYS_RCAR_I2C3_SPEED for for the speed channel 3
- - CONFIF_SYS_RCAR_I2C_NUM_CONTROLLERS for number of i2c buses
-
- drivers/i2c/sh_i2c.c:
- activate this driver with CONFIG_SYS_I2C_SH
- This driver adds from 2 to 5 i2c buses
- CONFIG_SYS_BAUDRATE_TABLE:
List of legal baudrate settings for this board.
-- CONFIG_SYS_MEMTEST_START, CONFIG_SYS_MEMTEST_END:
- Begin and End addresses of the area used by the
- simple 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
-
- CONFIG_SYS_MEM_RESERVE_SECURE
Only implemented for ARMv8 for now.
If defined, the size of CONFIG_SYS_MEM_RESERVE_SECURE memory
regular expression. This allows multiple variables to define the same
flags without explicitly listing them for each variable.
-- CONFIG_ENV_ACCESS_IGNORE_FORCE
- If defined, don't allow the -f switch to env set override variable
- access flags.
-
The following definitions that deal with the placement and management
of environment data (variable area); in general, we support the
following configurations:
$ CROSS_COMPILE=ppc_4xx-
$ export CROSS_COMPILE
-Note: If you wish to generate Windows versions of the utilities in
- the tools directory you can use the MinGW toolchain
- (http://www.mingw.org). Set your HOST tools to the MinGW
- toolchain and execute 'make tools'. For example:
-
- $ make HOSTCC=i586-mingw32msvc-gcc HOSTSTRIP=i586-mingw32msvc-strip tools
-
- Binaries such as tools/mkimage.exe will be created which can
- be executed on computers running Windows.
-
U-Boot is intended to be simple to build. After installing the
sources you must configure U-Boot for one specific board type. This
is done by typing:
make NAME_defconfig
where "NAME_defconfig" is the name of one of the existing configu-
-rations; see boards.cfg for supported names.
+rations; see configs/*_defconfig for supported names.
-Note: for some board special configuration names may exist; check if
+Note: for some boards special configuration names may exist; check if
additional information is available from the board vendor; for
instance, the TQM823L systems are available without (standard)
or with LCD support. You can select such additional "features"
mm - memory modify (auto-incrementing)
nm - memory modify (constant address)
mw - memory write (fill)
+ms - memory search
cp - memory copy
cmp - memory compare
crc32 - checksum calculation
CONFIG_NET_RETRY_COUNT, if defined. This value has
precedence over the valu based on CONFIG_NET_RETRY_COUNT.
+ memmatches - Number of matches found by the last 'ms' command, in hex
+
+ memaddr - Address of the last match found by the 'ms' command, in hex,
+ or 0 if none
+
+ mempos - Index position of the last match found by the 'ms' command,
+ in units of the size (.b, .w, .l) of the search
+
+
The following image location variables contain the location of images
used in booting. The "Image" column gives the role of the image and is
not an environment variable name. The other columns are environment
while (learning) {
Read the README file in the top level directory;
Read http://www.denx.de/twiki/bin/view/DULG/Manual;
- Read applicable doc/*.README;
+ Read applicable doc/README.*;
Read the source, Luke;
/* find . -name "*.[chS]" | xargs grep -i <keyword> */
}
* For new features: a description of the feature and your
implementation.
-* A CHANGELOG entry as plaintext (separate from the patch)
-
* For major contributions, add a MAINTAINERS file with your
information and associated file and directory references.
projects / platform / kernel / u-boot.git / blobdiff