http://www.denx.de/cgi-bin/gitweb.cgi?p=u-boot.git;a=summary
The "snapshot" links on this page allow you to download tarballs of
-any version you might be interested in. Ofifcial releases are also
+any version you might be interested in. Official releases are also
available for FTP download from the ftp://ftp.denx.de/pub/u-boot/
directory.
-Pre-build (and tested) images are available from
+Pre-built (and tested) images are available from
ftp://ftp.denx.de/pub/u-boot/images/
* Provide extended interface to Linux boot loader
* S-Record download
* network boot
- * PCMCIA / CompactFLash / ATA disk / SCSI ... boot
+ * PCMCIA / CompactFlash / ATA disk / SCSI ... boot
- create ARMBoot project (http://sourceforge.net/projects/armboot)
- add other CPU families (starting with ARM)
- create U-Boot project (http://sourceforge.net/projects/u-boot)
-- current project page: see http://www.denx.de/wiki/UBoot
+- current project page: see http://www.denx.de/wiki/U-Boot
Names and Spelling:
- at32ap Files specific to Atmel AVR32 AP CPUs
- i386 Files specific to i386 CPUs
- ixp Files specific to Intel XScale IXP CPUs
+ - leon2 Files specific to Gaisler LEON2 SPARC CPU
+ - leon3 Files specific to Gaisler LEON3 SPARC CPU
- mcf52x2 Files specific to Freescale ColdFire MCF52x2 CPUs
- mcf5227x Files specific to Freescale ColdFire MCF5227x CPUs
- mcf532x Files specific to Freescale ColdFire MCF5329 CPUs
- lib_mips Files generic to MIPS architecture
- lib_nios Files generic to NIOS architecture
- lib_ppc Files generic to PowerPC architecture
+- lib_sparc Files generic to SPARC architecture
- libfdt Library files to support flattened device trees
- net Networking code
- post Power On Self Test
cd u-boot
make TQM823L_config
-For the Cogent platform, you need to specify the cpu type as well;
+For the Cogent platform, you need to specify the CPU type as well;
e.g. "make cogent_mpc8xx_config". And also configure the cogent
directory according to the instructions in cogent/README.
- Motherboard Options: (if CONFIG_CMA101 or CONFIG_CMA102 are defined)
Define one or more of
CONFIG_LCD_HEARTBEAT - update a character position on
- the lcd display every second with
+ the LCD display every second with
a "rotator" |\-/|\-/
- Board flavour: (if CONFIG_MPC8260ADS is defined)
Define exactly one of
CONFIG_MPC8240, CONFIG_MPC8245
-- 8xx CPU Options: (if using an MPC8xx cpu)
+- 8xx CPU Options: (if using an MPC8xx CPU)
CONFIG_8xx_GCLK_FREQ - deprecated: CPU clock if
get_gclk_freq() cannot work
e.g. if there is no 32KHz
CONFIG_MEMSIZE_IN_BYTES [relevant for MIPS only]
- When transfering memsize parameter to linux, some versions
+ When transferring memsize parameter to linux, some versions
expect it to be in bytes, others in MB.
Define CONFIG_MEMSIZE_IN_BYTES to make it in bytes.
- CONFIG_OF_LIBFDT / CONFIG_OF_FLAT_TREE
+ CONFIG_OF_LIBFDT
New kernel versions are expecting firmware settings to be
passed using flattened device trees (based on open firmware
* Adds the "fdt" command
* The bootm command automatically updates the fdt
- CONFIG_OF_FLAT_TREE
- * Deprecated, see CONFIG_OF_LIBFDT
- * Original ft_build.c-based support
- * Automatically modifies the dft as part of the bootm command
- * The environment variable "disable_of", when set,
- disables this functionality.
-
OF_CPU - The proper name of the cpus node.
OF_SOC - The proper name of the soc node.
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
-
- CONFIG_OF_HAS_BD_T
-
- * CONFIG_OF_LIBFDT - enables the "fdt bd_t" command
- * CONFIG_OF_FLAT_TREE - The resulting flat device tree
- will have a copy of the bd_t. Space should be
- pre-allocated in the dts for the bd_t.
-
- CONFIG_OF_HAS_UBOOT_ENV
-
- * CONFIG_OF_LIBFDT - enables the "fdt env" command
- * CONFIG_OF_FLAT_TREE - The resulting flat device tree
- will have a copy of u-boot's environment variables
+ boards with QUICC Engines require OF_QE to set UCC MAC
+ addresses
CONFIG_OF_BOARD_SETUP
CONFIG_OF_BOOT_CPU
- This define fills in the correct boot cpu in the boot
+ This define fills in the correct boot CPU in the boot
param header, the default value is zero if undefined.
- Serial Ports:
- CFG_PL010_SERIAL
+ CONFIG_PL010_SERIAL
Define this if you want support for Amba PrimeCell PL010 UARTs.
- CFG_PL011_SERIAL
+ CONFIG_PL011_SERIAL
Define this if you want support for Amba PrimeCell PL011 UARTs.
linux_logo.h for logo.
Requires CONFIG_VIDEO_LOGO
CONFIG_CONSOLE_EXTRA_INFO
- addional board info beside
+ additional board info beside
the logo
When CONFIG_CFB_CONSOLE is defined, video console is
The value of these goes into the environment as
"ramboot" and "nfsboot" respectively, and can be used
as a convenience, when switching between booting from
- ram and nfs.
+ RAM and NFS.
- Pre-Boot Commands:
CONFIG_PREBOOT
CONFIG_CMD_SPI * SPI serial bus support
CONFIG_CMD_USB * USB support
CONFIG_CMD_VFD * VFD support (TRAB)
- CONFIG_CMD_BSP * Board SPecific functions
CONFIG_CMD_CDP * Cisco Discover Protocol support
CONFIG_CMD_FSL * Microblaze FSL support
CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx
CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC
+ CONFIG_RTC_MC13783 - use MC13783 RTC
CONFIG_RTC_MC146818 - use MC146818 RTC
CONFIG_RTC_DS1307 - use Maxim, Inc. DS1307 RTC
CONFIG_RTC_DS1337 - use Maxim, Inc. DS1337 RTC
CONFIG_RTC_DS164x - use Dallas DS164x RTC
CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
+ CFG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
Note that if the RTC uses I2C, then the I2C interface
must also be configured. See I2C Support, below.
CONFIG_E1000
Support for Intel 8254x gigabit chips.
+ CONFIG_E1000_FALLBACK_MAC
+ default MAC for empty EEPROM after production.
+
CONFIG_EEPRO100
Support for Intel 82557/82559/82559ER chips.
- Optional CONFIG_EEPRO100_SROM_WRITE enables eeprom
+ Optional CONFIG_EEPRO100_SROM_WRITE enables EEPROM
write routine for first time initialisation.
CONFIG_TULIP
Define this to use i/o functions instead of macros
(some hardware wont work with macros)
+ CONFIG_DRIVER_SMC911X
+ Support for SMSC's LAN911x and LAN921x chips
+
+ CONFIG_DRIVER_SMC911X_BASE
+ Define this to hold the physical address
+ of the device (I/O space)
+
+ CONFIG_DRIVER_SMC911X_32_BIT
+ Define this if data bus is 32 bits
+
+ CONFIG_DRIVER_SMC911X_16_BIT
+ Define this if data bus is 16 bits. If your processor
+ automatically converts one 32 bit word to two 16 bit
+ words you may also try CONFIG_DRIVER_SMC911X_32_BIT.
+
- USB Support:
At the moment only the UHCI host controller is
supported (PIP405, MIP405, MPC5200); define
Define the below if you wish to use the USB console.
Once firmware is rebuilt from a serial console issue the
command "setenv stdin usbtty; setenv stdout usbtty" and
- attach your usb cable. The Unix command "dmesg" should print
+ attach your USB cable. The Unix command "dmesg" should print
it has found a new device. The environment variable usbtty
can be set to gserial or cdc_acm to enable your device to
appear to a USB host as a Linux gserial device or a
assumed.
For the CT69000 and SMI_LYNXEM drivers, videomode is
- selected via environment 'videomode'. Two diferent ways
+ selected via environment 'videomode'. Two different ways
are possible:
- "videomode=num" 'num' is a standard LiLo mode numbers.
Following standard modes are supported (* is default):
display); also select one of the supported displays
by defining one of these:
+ CONFIG_ATMEL_LCD:
+
+ HITACHI TX09D70VM1CCA, 3.5", 240x320.
+
CONFIG_NEC_NL6448AC33:
NEC NL6448AC33-18. Active, color, single scan.
CONFIG_PHY_GIGE
If this option is set, support for speed/duplex
- detection of Gigabit PHY is included.
+ detection of gigabit PHY is included.
CONFIG_PHY_RESET_DELAY
CONFIG_ETH2ADDR
CONFIG_ETH3ADDR
- Define a default value for ethernet address to use
- for the respective ethernet interface, in case this
+ Define a default value for Ethernet address to use
+ for the respective Ethernet interface, in case this
is not determined automatically.
- IP address:
CONFIG_IPADDR
Define a default value for the IP address to use for
- the default ethernet interface, in case this is not
+ the default Ethernet interface, in case this is not
determined through e.g. bootp.
- Server IP address:
CONFIG_SERVERIP
- Defines a default value for theIP address of a TFTP
+ Defines a default value for the IP address of a TFTP
server to contact when using the "tftboot" command.
- Multicast TFTP Mode:
Defines whether you want to support multicast TFTP as per
rfc-2090; for example to work with atftp. Lets lots of targets
- tftp down the same boot image concurrently. Note: the ethernet
+ tftp down the same boot image concurrently. Note: the Ethernet
driver in use must provide a function: mcast() to join/leave a
multicast group.
of the "hostname" environment variable is passed as
option 12 to the DHCP server.
+ CONFIG_BOOTP_DHCP_REQUEST_DELAY
+
+ A 32bit value in microseconds for a delay between
+ receiving a "DHCP Offer" and sending the "DHCP Request".
+ This fixes a problem with certain DHCP servers that don't
+ respond 100% of the time to a "DHCP request". E.g. On an
+ AT91RM9200 processor running at 180MHz, this delay needed
+ to be *at least* 15,000 usec before a Windows Server 2003
+ DHCP server would reply 100% of the time. I recommend at
+ least 50,000 usec to be safe. The alternative is to hope
+ that one of the retries will be successful but note that
+ the DHCP timeout and retry process takes a longer than
+ this delay.
+
- CDP Options:
CONFIG_CDP_DEVICE_ID
A printf format string which contains the ascii name of
the port. Normally is set to "eth%d" which sets
- eth0 for the first ethernet, eth1 for the second etc.
+ eth0 for the first Ethernet, eth1 for the second etc.
CONFIG_CDP_CAPABILITIES
These enable I2C serial bus commands. Defining either of
(but not both of) CONFIG_HARD_I2C or CONFIG_SOFT_I2C will
- include the appropriate I2C driver for the selected cpu.
+ include the appropriate I2C driver for the selected CPU.
This will allow you to use i2c commands at the u-boot
command line (as long as you set CONFIG_CMD_I2C in
In both cases you will need to define CFG_I2C_SPEED
to be the frequency (in Hz) at which you wish your i2c bus
to run and CFG_I2C_SLAVE to be the address of this node (ie
- the cpu's i2c node address).
+ the CPU's i2c node address).
Now, the u-boot i2c code for the mpc8xx (cpu/mpc8xx/i2c.c)
- sets the cpu up as a master node and so its address should
+ sets the CPU up as a master node and so its address should
therefore be cleared to 0 (See, eg, MPC823e User's Manual
p.16-473). So, set CFG_I2C_SLAVE to 0.
If defined, then this indicates the I2C bus number for the DTT.
If not defined, then U-Boot assumes that DTT is on I2C bus 0.
+ CFG_I2C_DTT_ADDR:
+
+ If defined, specifies the I2C address of the DTT device.
+ If not defined, then U-Boot uses predefined value for
+ specified DTT device.
+
CONFIG_FSL_I2C
Define this option if you want to use Freescale's I2C driver in
Currently supported on some MPC8xxx processors. For an
example, see include/configs/mpc8349emds.h.
+ CONFIG_MXC_SPI
+
+ Enables the driver for the SPI controllers on i.MX and MXC
+ SoCs. Currently only i.MX31 is supported.
+
- FPGA Support: CONFIG_FPGA
Enables FPGA subsystem.
Maximum time to wait for the INIT_B line to deassert
after PROB_B has been deasserted during a Virtex II
FPGA configuration sequence. The default time is 500
- mS.
+ ms.
CFG_FPGA_WAIT_BUSY
Maximum time to wait for BUSY to deassert during
- Virtex II FPGA configuration. The default is 5 mS.
+ Virtex II FPGA configuration. The default is 5 ms.
CFG_FPGA_WAIT_CONFIG
Time to wait after FPGA configuration. The default is
- 200 mS.
+ 200 ms.
- Configuration Management:
CONFIG_IDENT_STRING
protects these variables from casual modification by
the user. Once set, these variables are read-only,
and write or delete attempts are rejected. You can
- change this behviour:
+ change this behaviour:
If CONFIG_ENV_OVERWRITE is #defined in your config
file, the write protection for vendor parameters is
Alternatively, if you #define _both_ CONFIG_ETHADDR
_and_ CONFIG_OVERWRITE_ETHADDR_ONCE, a default
- ethernet address is installed in the environment,
+ Ethernet address is installed in the environment,
which can be changed exactly ONCE by the user. [The
serial# is unaffected by this, i. e. it remains
read-only.]
Define this variable to stop the system in case of a
fatal error, so that you have to reset it manually.
This is probably NOT a good idea for an embedded
- system where you want to system to reboot
+ system where you want the system to reboot
automatically as fast as possible, but it may be
useful during development since you can try to debug
the conditions that lead to the situation.
before giving up the operation. If not defined, a
default value of 5 is used.
+ CONFIG_ARP_TIMEOUT
+
+ Timeout waiting for an ARP reply in milliseconds.
+
- Command Interpreter:
CONFIG_AUTO_COMPLETE
- Commandline Editing and History:
CONFIG_CMDLINE_EDITING
- Enable editiong and History functions for interactive
+ Enable editing and History functions for interactive
commandline input operations
- Default Environment:
Adding this option adds support for Xilinx SystemACE
chips attached via some sort of local bus. The address
- of the chip must alsh be defined in the
+ of the chip must also be defined in the
CFG_SYSTEMACE_BASE macro. For example:
#define CONFIG_SYSTEMACE
-12 common/image.c Ramdisk data has bad checksum
11 common/image.c Ramdisk data has correct checksum
12 common/image.c Ramdisk verification complete, start loading
- -13 common/image.c Wrong Image Type (not PPC Linux Ramdisk)
+ -13 common/image.c Wrong Image Type (not PPC Linux ramdisk)
13 common/image.c Start multifile image verification
14 common/image.c No initial ramdisk, no multifile, continue.
-60 common/env_common.c Environment has a bad CRC, using default
- 64 net/eth.c starting with Ethernetconfiguration.
+ 64 net/eth.c starting with Ethernet configuration.
-64 net/eth.c no Ethernet found.
65 net/eth.c Ethernet found.
-80 common/cmd_net.c usage wrong
80 common/cmd_net.c before calling NetLoop()
- -81 common/cmd_net.c some error in NetLoop() occured
+ -81 common/cmd_net.c some error in NetLoop() occurred
81 common/cmd_net.c NetLoop() back without error
-82 common/cmd_net.c size == 0 (File with size 0 loaded)
82 common/cmd_net.c trying automatic boot
105 common/cmd_bootm.c Kernel subimage hash verification OK
-105 common/cmd_bootm.c Kernel subimage is for unsupported architecture
106 common/cmd_bootm.c Architecture check OK
- -106 common/cmd_bootm.c Kernel subimage has wrong typea
- 107 common/cmd_bootm.c Kernel subimge type OK
+ -106 common/cmd_bootm.c Kernel subimage has wrong type
+ 107 common/cmd_bootm.c Kernel subimage type OK
-107 common/cmd_bootm.c Can't get kernel subimage data/size
108 common/cmd_bootm.c Got kernel subimage data/size
-108 common/cmd_bootm.c Wrong image type (not legacy, FIT)
120 common/image.c Start initial ramdisk verification
-120 common/image.c Ramdisk FIT image has incorrect format
121 common/image.c Ramdisk FIT image has correct format
- 122 common/image.c No Ramdisk subimage unit name, using configuration
+ 122 common/image.c No ramdisk subimage unit name, using configuration
-122 common/image.c Can't get configuration for ramdisk subimage
123 common/image.c Ramdisk unit name specified
-124 common/image.c Can't get ramdisk subimage node offset
129 common/image.c Can't get ramdisk load address
-129 common/image.c Got ramdisk load address
- -130 common/cmd_doc.c Icorrect FIT image format
+ -130 common/cmd_doc.c Incorrect FIT image format
131 common/cmd_doc.c FIT image format OK
- -140 common/cmd_ide.c Icorrect FIT image format
+ -140 common/cmd_ide.c Incorrect FIT image format
141 common/cmd_ide.c FIT image format OK
- -150 common/cmd_nand.c Icorrect FIT image format
+ -150 common/cmd_nand.c Incorrect FIT image format
151 common/cmd_nand.c FIT image format OK
[so far only for SMDK2400 and TRAB boards]
-- Modem support endable:
+- Modem support enable:
CONFIG_MODEM_SUPPORT
- RTS/CTS Flow control enable:
There are common interrupt_init() and timer_interrupt()
for all PPC archs. interrupt_init() calls interrupt_init_cpu()
- for cpu specific initialization. interrupt_init_cpu()
+ for CPU specific initialization. interrupt_init_cpu()
should set decrementer_count to appropriate value. If
- cpu resets decrementer automatically after interrupt
+ CPU resets decrementer automatically after interrupt
(ppc4xx) it should set decrementer_count to zero.
- timer_interrupt() calls timer_interrupt_cpu() for cpu
+ timer_interrupt() calls timer_interrupt_cpu() for CPU
specific handling. If board has watchdog / status_led
/ other_activity_monitor it works automatically from
general timer_interrupt().
In the target system modem support is enabled when a
specific key (key combination) is pressed during
power-on. Otherwise U-Boot will boot normally
- (autoboot). The key_pressed() fuction is called from
+ (autoboot). The key_pressed() function is called from
board_init(). Currently key_pressed() is a dummy
function, returning 1 and thus enabling modem
initialization.
If there are no modem init strings in the
environment, U-Boot proceed to autoboot; the
previous output (banner, info printfs) will be
- supressed, though.
+ suppressed, though.
See also: doc/README.Modem
Scratch address used by the alternate memory test
You only need to set this if address zero isn't writeable
+- CFG_MEM_TOP_HIDE (PPC only):
+ If CFG_MEM_TOP_HIDE is defined in the board config header,
+ this specified memory area will get subtracted from the top
+ (end) of RAM and won't get "touched" at all by U-Boot. By
+ fixing up gd->ram_size the Linux kernel should gets passed
+ the now "corrected" memory size and won't touch it either.
+ This should work for arch/ppc and arch/powerpc. Only Linux
+ board ports in arch/powerpc with bootwrapper support that
+ recalculate the memory size from the SDRAM controller setup
+ will have to get fixed in Linux additionally.
+
+ This option can be used as a workaround for the 440EPx/GRx
+ CHIP 11 errata where the last 256 bytes in SDRAM shouldn't
+ be touched.
+
+ WARNING: Please make sure that this value is a multiple of
+ the Linux page size (normally 4k). If this is not the case,
+ then the end address of the Linux memory will be located at a
+ non page size aligned address and this could cause major
+ problems.
+
- CFG_TFTP_LOADADDR:
Default load address for network file downloads
- CFG_BOOTMAPSZ:
Maximum size of memory mapped by the startup code of
the Linux kernel; all data that must be processed by
- the Linux kernel (bd_info, boot arguments, eventually
- initrd image) must be put below this limit.
+ the Linux kernel (bd_info, boot arguments, FDT blob if
+ used) must be put below this limit, unless "bootm_low"
+ enviroment variable is defined and non-zero. In such case
+ all data for the Linux kernel must be between "bootm_low"
+ and "bootm_low" + CFG_BOOTMAPSZ.
- CFG_MAX_FLASH_BANKS:
Max number of Flash memory banks
The two-step approach is usually more reliable, since
you can check if the download worked before you erase
- the flash, but in some situations (when sytem RAM is
- too limited to allow for a tempory copy of the
+ the flash, but in some situations (when system RAM is
+ too limited to allow for a temporary copy of the
downloaded image) this option may be very useful.
- CFG_FLASH_CFI:
Define if the flash driver uses extra elements in the
common flash structure for storing flash geometry.
-- CFG_FLASH_CFI_DRIVER
+- CONFIG_FLASH_CFI_DRIVER
This option also enables the building of the cfi_flash driver
in the drivers directory
+- CFG_FLASH_USE_BUFFER_WRITE
+ Use buffered writes to flash.
+
+- CONFIG_FLASH_SPANSION_S29WS_N
+ s29ws-n MirrorBit flash has non-standard addresses for buffered
+ write commands.
+
- CFG_FLASH_QUIET_TEST
If this option is defined, the common CFI flash doesn't
print it's warning upon not recognized FLASH banks. This
column displays, 15 (3..1) for 40 column displays.
- CFG_RX_ETH_BUFFER:
- Defines the number of ethernet receive buffers. On some
- ethernet controllers it is recommended to set this value
+ Defines the number of Ethernet receive buffers. On some
+ Ethernet controllers it is recommended to set this value
to 8 or even higher (EEPRO100 or 405 EMAC), since all
buffers can be full shortly after enabling the interface
- on high ethernet traffic.
+ on high Ethernet traffic.
Defaults to 4 if not defined.
The following definitions that deal with the placement and management
CFG_ENV_SIZE_REDUND
These settings describe a second storage area used to hold
- a redundand copy of the environment data, so that there is
+ a redundant copy of the environment data, so that there is
a valid backup copy in case there is a power failure during
a "saveenv" operation.
- CFG_ENV_ADDR:
- CFG_ENV_SIZE:
- These two #defines are used to determin the memory area you
+ These two #defines are used to determine the memory area you
want to use for environment. It is assumed that this memory
can just be read and written to, without any special
provision.
BE CAREFUL! The first access to the environment happens quite early
in U-Boot initalization (when we try to get the setting of for the
-console baudrate). You *MUST* have mappend your NVRAM area then, or
+console baudrate). You *MUST* have mapped your NVRAM area then, or
U-Boot will hang.
Please note that even with NVRAM we still use a copy of the
to save the current settings.
-- CFG_ENV_IS_IN_EEPROM:
+- CONFIG_ENV_IS_IN_EEPROM:
Use this if you have an EEPROM or similar serial access
device and a driver for it.
The size in bytes of the EEPROM device.
-- CFG_ENV_IS_IN_DATAFLASH:
+- CONFIG_ENV_IS_IN_DATAFLASH:
Define this if you have a DataFlash memory device which you
want to use for the environment.
CFG_ISA_IO_STRIDE
- defines the spacing between fdc chipset registers
+ defines the spacing between FDC chipset registers
(default value 1)
CFG_ISA_IO_OFFSET
defines the offset of register from address. It
depends on which part of the data bus is connected to
- the fdc chipset. (default value 0)
+ the FDC chipset. (default value 0)
If CFG_ISA_IO_STRIDE CFG_ISA_IO_OFFSET and
CFG_FDC_DRIVE_NUMBER are undefined, they take their
Normally these variables MUST NOT be defined. The
only exception is when U-Boot is loaded (to RAM) by
some other boot loader or by a debugger which
- performs these intializations itself.
+ performs these initializations itself.
Building the Software:
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"
- when chosing the configuration, i. e.
+ when choosing the configuration, i. e.
make TQM823L_config
- will configure for a plain TQM823L, i. e. no LCD support
bootfile - Name of the image to load with TFTP
+ bootm_low - Memory range available for image processing in the bootm
+ command can be restricted. This variable is given as
+ a hexadecimal number and defines lowest address allowed
+ for use by the bootm command. See also "bootm_size"
+ environment variable. Address defined by "bootm_low" is
+ also the base of the initial memory mapping for the Linux
+ kernel -- see the description of CFG_BOOTMAPSZ.
+
+ bootm_size - Memory range available for image processing in the bootm
+ command can be restricted. This variable is given as
+ a hexadecimal number and defines the size of the region
+ allowed for use by the bootm command. See also "bootm_low"
+ environment variable.
+
autoload - if set to "no" (any string beginning with 'n'),
"bootp" will just load perform a lookup of the
configuration from the BOOTP server, but not try to
themselves.
npe_ucode - see CONFIG_IXP4XX_NPE_EXT_UCOD
- if set load address for the npe microcode
+ if set load address for the NPE microcode
tftpsrcport - If this is set, the value is used for TFTP's
UDP source port.
destination port instead of the Well Know Port 69.
vlan - When set to a value < 4095 the traffic over
- ethernet is encapsulated/received over 802.1q
+ Ethernet is encapsulated/received over 802.1q
VLAN tagged frames.
The following environment variables may be used and automatically
executed anyway.
(2) If you execute several variables with one call to run (i. e.
- calling run with a list af variables as arguments), any failing
+ 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:
=======================================
-Some boards come with redundant ethernet interfaces; U-Boot supports
+Some boards come with redundant Ethernet interfaces; U-Boot supports
such configurations and is capable of automatic selection of a
"working" interface when needed. MAC assignment works as follows:
* Target Operating System (Provisions for OpenBSD, NetBSD, FreeBSD,
4.4BSD, Linux, SVR4, Esix, Solaris, Irix, SCO, Dell, NCR, VxWorks,
- LynxOS, pSOS, QNX, RTEMS, ARTOS;
- Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, ARTOS, LynxOS).
+ LynxOS, pSOS, QNX, RTEMS, INTEGRITY;
+ Currently supported: Linux, NetBSD, VxWorks, QNX, RTEMS, LynxOS,
+ INTEGRITY).
* Target CPU Architecture (Provisions for Alpha, ARM, AVR32, Intel x86,
IA64, MIPS, NIOS, PowerPC, IBM S390, SuperH, Sparc, Sparc 64 Bit;
Currently supported: ARM, AVR32, Intel x86, MIPS, NIOS, PowerPC).
Just make sure your machine specific header file (for instance
include/asm-ppc/tqm8xx.h) includes the same definition of the Board
-Information structure as we define in include/u-boot.h, and make
-sure that your definition of IMAP_ADDR uses the same value as your
-U-Boot configuration in CFG_IMMR.
+Information structure as we define in include/asm-<arch>/u-boot.h,
+and make sure that your definition of IMAP_ADDR uses the same value
+as your U-Boot configuration in CFG_IMMR.
Configuring the Linux kernel:
Memory: 15208k available (700k kernel code, 444k data, 32k init) [c0000000,c1000000]
...
-If you want to boot a Linux kernel with initial ram disk, you pass
+If you want to boot a Linux kernel with initial RAM disk, you pass
the memory addresses of both the kernel and the initrd image (PPBCOOT
format!) to the "bootm" command:
require any physical RAM backing up the cache. The cleverness
is that the cache is being used as a temporary supply of
necessary storage before the SDRAM controller is setup. It's
- beyond the scope of this list to expain the details, but you
+ beyond the scope of this list to explain the details, but you
can see how this works by studying the cache architecture and
operation in the architecture and processor-specific manuals.
OCM is On Chip Memory, which I believe the 405GP has 4K. It
is another option for the system designer to use as an
- initial stack/ram area prior to SDRAM being available. Either
+ initial stack/RAM area prior to SDRAM being available. Either
option should work for you. Using CS 4 should be fine if your
board designers haven't used it for something that would
cause you grief during the initial boot! It is frequently not
* Initialized global data (data segment) is read-only. Do not attempt
to write it.
-* Do not use any unitialized global data (or implicitely initialized
+* Do not use any uninitialized global data (or implicitely initialized
as zero data - BSS segment) at all - this is undefined, initiali-
zation is performed later (when relocating to RAM).
----------------------
In the reset configuration, U-Boot starts at the reset entry point
-(on most PowerPC systens at address 0x00000100). Because of the reset
+(on most PowerPC systems at address 0x00000100). Because of the reset
configuration for CS0# this is a mirror of the onboard Flash memory.
To be able to re-map memory U-Boot then jumps to its link address.
To be able to implement the initialization code in C, a (small!)
Patches shall be sent to the u-boot-users mailing list.
-Please see http://www.denx.de/wiki/UBoot/Patches for details.
+Please see http://www.denx.de/wiki/U-Boot/Patches for details.
When you send a patch, please include the following information with
it:
projects / u-boot.git / blobdiff