U-Boot 2016-05-rc2：嵌入式系统引导加载器源代码概览

U-Boot

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File: /home/kart/u-boot/README Page 15 of 92

CONFIG_CMD_ENV_EXISTS * check existence of env variable

CONFIG_CMD_EXPORTENV * export the environment

CONFIG_CMD_EXT2 * ext2 command support

CONFIG_CMD_EXT4 * ext4 command support

CONFIG_CMD_FS_GENERIC * filesystem commands (e.g. load, ls)

that work for multiple fs types

CONFIG_CMD_FS_UUID * Look up a filesystem UUID

CONFIG_CMD_SAVEENV saveenv

CONFIG_CMD_FDC * Floppy Disk Support

CONFIG_CMD_FAT * FAT command support

CONFIG_CMD_FLASH flinfo, erase, protect

CONFIG_CMD_FPGA FPGA device initialization support

CONFIG_CMD_FUSE * Device fuse support

CONFIG_CMD_GETTIME * Get time since boot

CONFIG_CMD_GO * the 'go' command (exec code)

CONFIG_CMD_GREPENV * search environment

CONFIG_CMD_HASH * calculate hash / digest

CONFIG_CMD_I2C * I2C serial bus support

CONFIG_CMD_IDE * IDE harddisk support

CONFIG_CMD_IMI iminfo

CONFIG_CMD_IMLS List all images found in NOR flash

CONFIG_CMD_IMLS_NAND * List all images found in NAND flash

CONFIG_CMD_IMMAP * IMMR dump support

CONFIG_CMD_IOTRACE * I/O tracing for debugging

CONFIG_CMD_IMPORTENV * import an environment

CONFIG_CMD_INI * import data from an ini file into the env

CONFIG_CMD_IRQ * irqinfo

CONFIG_CMD_ITEST Integer/string test of 2 values

CONFIG_CMD_JFFS2 * JFFS2 Support

CONFIG_CMD_KGDB * kgdb

CONFIG_CMD_LDRINFO * ldrinfo (display Blackfin loader)

CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration

(169.254.*.*)

CONFIG_CMD_LOADB loadb

CONFIG_CMD_LOADS loads

CONFIG_CMD_MD5SUM * print md5 message digest

(requires CONFIG_CMD_MEMORY and CONFIG_MD5)

CONFIG_CMD_MEMINFO * Display detailed memory information

CONFIG_CMD_MEMORY md, mm, nm, mw, cp, cmp, crc, base,

loop, loopw

CONFIG_CMD_MEMTEST * mtest

CONFIG_CMD_MISC Misc functions like sleep etc

CONFIG_CMD_MMC * MMC memory mapped support

CONFIG_CMD_MII * MII utility commands

CONFIG_CMD_MTDPARTS * MTD partition support

CONFIG_CMD_NAND * NAND support

CONFIG_CMD_NET bootp, tftpboot, rarpboot

CONFIG_CMD_NFS NFS support

CONFIG_CMD_PCA953X * PCA953x I2C gpio commands

CONFIG_CMD_PCA953X_INFO * PCA953x I2C gpio info command

CONFIG_CMD_PCI * pciinfo

CONFIG_CMD_PCMCIA * PCMCIA support

CONFIG_CMD_PING * send ICMP ECHO_REQUEST to network

host

CONFIG_CMD_PORTIO * Port I/O

CONFIG_CMD_READ * Read raw data from partition

CONFIG_CMD_REGINFO * Register dump

CONFIG_CMD_RUN run command in env variable

CONFIG_CMD_SANDBOX * sb command to access sandbox features

CONFIG_CMD_SAVES * save S record dump

CONFIG_CMD_SCSI * SCSI Support

CONFIG_CMD_SDRAM * print SDRAM configuration information

(requires CONFIG_CMD_I2C)

CONFIG_CMD_SETGETDCR Support for DCR Register access

(4xx only)

CONFIG_CMD_SF * Read/write/erase SPI NOR flash

CONFIG_CMD_SHA1SUM * print sha1 memory digest

(requires CONFIG_CMD_MEMORY)

CONFIG_CMD_SOFTSWITCH * Soft switch setting command for BF60x

CONFIG_CMD_SOURCE "source" command Support

CONFIG_CMD_SPI * SPI serial bus support

CONFIG_CMD_TFTPSRV * TFTP transfer in server mode

File: /home/kart/u-boot/README Page 16 of 92

CONFIG_CMD_TFTPPUT * TFTP put command (upload)

CONFIG_CMD_TIME * run command and report execution time (ARM specific)

CONFIG_CMD_TIMER * access to the system tick timer

CONFIG_CMD_USB * USB support

CONFIG_CMD_CDP * Cisco Discover Protocol support

CONFIG_CMD_MFSL * Microblaze FSL support

CONFIG_CMD_XIMG Load part of Multi Image

CONFIG_CMD_UUID * Generate random UUID or GUID string

EXAMPLE: If you want all functions except of network

support you can write:

#include "config_cmd_all.h"

#undef CONFIG_CMD_NET

Other Commands:

fdt (flattened device tree) command: CONFIG_OF_LIBFDT

Note: Don't enable the "icache" and "dcache" commands

(configuration option CONFIG_CMD_CACHE) unless you know

what you (and your U-Boot users) are doing. Data

cache cannot be enabled on systems like the 8xx or

8260 (where accesses to the IMMR region must be

uncached), and it cannot be disabled on all other

systems where we (mis-) use the data cache to hold an

initial stack and some data.

XXX - this list needs to get updated!

- Removal of commands

If no commands are needed to boot, you can disable

CONFIG_CMDLINE to remove them. In this case, the command line

will not be available, and when U-Boot wants to execute the

boot command (on start-up) it will call board_run_command()

instead. This can reduce image size significantly for very

simple boot procedures.

- Regular expression support:

CONFIG_REGEX

If this variable is defined, U-Boot is linked against

the SLRE (Super Light Regular Expression) library,

which adds regex support to some commands, as for

example "env grep" and "setexpr".

- Device tree:

CONFIG_OF_CONTROL

If this variable is defined, U-Boot will use a device tree

to configure its devices, instead of relying on statically

compiled #defines in the board file. This option is

experimental and only available on a few boards. The device

tree is available in the global data as gd->fdt_blob.

U-Boot needs to get its device tree from somewhere. This can

be done using one of the two options below:

CONFIG_OF_EMBED

If this variable is defined, U-Boot will embed a device tree

binary in its image. This device tree file should be in the

board directory and called <soc>-<board>.dts. The binary file

is then picked up in board_init_f() and made available through

the global data structure as gd->blob.

CONFIG_OF_SEPARATE

If this variable is defined, U-Boot will build a device tree

binary. It will be called u-boot.dtb. Architecture-specific

code will locate it at run-time. Generally this works by:

cat u-boot.bin u-boot.dtb >image.bin

and in fact, U-Boot does this for you, creating a file called

u-boot-dtb.bin which is useful in the common case. You can

File: /home/kart/u-boot/README Page 17 of 92

still use the individual files if you need something more

exotic.

- Watchdog:

CONFIG_WATCHDOG

If this variable is defined, it enables watchdog

support for the SoC. There must be support in the SoC

specific code for a watchdog. For the 8xx and 8260

CPUs, the SIU Watchdog feature is enabled in the SYPCR

available, then no further board specific code should

be needed to use it.

CONFIG_HW_WATCHDOG

When using a watchdog circuitry external to the used

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.

- 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

has to be selected, too. Define exactly one of the

following options:

CONFIG_RTC_MPC8xx - use internal RTC of MPC8xx

CONFIG_RTC_PCF8563 - use Philips PCF8563 RTC

CONFIG_RTC_MC13XXX - use MC13783 or MC13892 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_DS1338 - use Maxim, Inc. DS1338 RTC

CONFIG_RTC_DS1339 - use Maxim, Inc. DS1339 RTC

CONFIG_RTC_DS164x - use Dallas DS164x RTC

CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC

CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC

CONFIG_SYS_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337

CONFIG_SYS_RV3029_TCR - enable trickle charger on

RV3029 RTC.

Note that if the RTC uses I2C, then the I2C interface

must also be configured. See I2C Support, below.

- GPIO Support:

CONFIG_PCA953X - use NXP's PCA953X series I2C GPIO

The CONFIG_SYS_I2C_PCA953X_WIDTH option specifies a list of

chip-ngpio pairs that tell the PCA953X driver the number of

pins supported by a particular chip.

Note that if the GPIO device uses I2C, then the I2C interface

must also be configured. See I2C Support, below.

- I/O tracing:

When CONFIG_IO_TRACE is selected, U-Boot intercepts all I/O

accesses and can checksum them or write a list of them out

to memory. See the 'iotrace' command for details. This is

useful for testing device drivers since it can confirm that

the driver behaves the same way before and after a code

change. Currently this is supported on sandbox and arm. To

add support for your architecture, add '#include <iotrace.h>'

to the bottom of arch/<arch>/include/asm/io.h and test.

File: /home/kart/u-boot/README Page 18 of 92

Example output from the 'iotrace stats' command is below.

Note that if the trace buffer is exhausted, the checksum will

still continue to operate.

iotrace is enabled

Start: 10000000 (buffer start address)

Size: 00010000 (buffer size)

Offset: 00000120 (current buffer offset)

Output: 10000120 (start + offset)

Count: 00000018 (number of trace records)

CRC32: 9526fb66 (CRC32 of all trace records)

- Timestamp Support:

When CONFIG_TIMESTAMP is selected, the timestamp

(date and time) of an image is printed by image

commands like bootm or iminfo. This option is

automatically enabled when you select CONFIG_CMD_DATE .

- Partition Labels (disklabels) Supported:

Zero or more of the following:

CONFIG_MAC_PARTITION Apple's MacOS partition table.

CONFIG_DOS_PARTITION MS Dos partition table, traditional on the

Intel architecture, USB sticks, etc.

CONFIG_ISO_PARTITION ISO partition table, used on CDROM etc.

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_CMD_IDE or

CONFIG_CMD_SCSI) you must configure support for at

least one non-MTD partition type as well.

- IDE Reset method:

CONFIG_IDE_RESET_ROUTINE - this is defined in several

board configurations files but used nowhere!

CONFIG_IDE_RESET - is this is defined, IDE Reset will

be performed by calling the function

ide_set_reset(int reset)

which has to be defined in a board specific file

- ATAPI Support:

CONFIG_ATAPI

Set this to enable ATAPI support.

- LBA48 Support

CONFIG_LBA48

Set this to enable support for disks larger than 137GB

Also look at CONFIG_SYS_64BIT_LBA.

Whithout these , LBA48 support uses 32bit variables and will 'only'

support disks up to 2.1TB.

CONFIG_SYS_64BIT_LBA:

When enabled, makes the IDE subsystem use 64bit sector addresses.

Default is 32bit.

- SCSI Support:

At the moment only there is only support for the

SYM53C8XX SCSI controller; define

CONFIG_SCSI_SYM53C8XX to enable it.

CONFIG_SYS_SCSI_MAX_LUN [8], CONFIG_SYS_SCSI_MAX_SCSI_ID [7] and

CONFIG_SYS_SCSI_MAX_DEVICE [CONFIG_SYS_SCSI_MAX_SCSI_ID *

CONFIG_SYS_SCSI_MAX_LUN] can be adjusted to define the

maximum numbers of LUNs, SCSI ID's and target

devices.

CONFIG_SYS_SCSI_SYM53C8XX_CCF to fix clock timing (80Mhz)

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Charleye

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