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Uboot_readme中文注释版.rar

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Uboot_readme中文注释版

这是本人在网上搜集整理的，希望和我对大家能够有帮助，希望大家不断的将其完善，大家的改进版希望能够给我回发一份，感谢大家。

前面是Uboot的发展，下载地址，如何获得帮助，以及版本说明

Directory Hierarchy:
目录层次
====================

- board??Board dependent files
????????? 开发板相关文件
- common?Misc architecture independent functions
????????? 多体系结构独立函数
- cpu??? CPU specific files
????????? CPU相关文件
? - 74xx_7xx?? Files specific to Freescale MPC74xx and 7xx CPUs
? ???????????? Freescale MPC74XX的CPU相关文件
? - arm720t???? Files specific to ARM 720 CPUs
??????????????? ARM720相关文件
? - arm920t???? Files specific to ARM 920 CPUs
??????????????? ARM920相关文件
? - at91rm9200? Files specific to Atmel AT91RM9200 CPU
??????????????? AT91RM9200相关
? - imx?????? Files specific to Freescale MC9328 i.MX CPUs
????????????? Freescale i.MX相关
? - s3c24x0?? Files specific to Samsung S3C24X0 CPUs
? - arm925t?? Files specific to ARM 925 CPUs
? - arm926ejs?Files specific to ARM 926 CPUs
? - arm1136?? Files specific to ARM 1136 CPUs
? - 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
? - mcf5445x?Files specific to Freescale ColdFire MCF5445x CPUs
? - mcf547x_8x?Files specific to Freescale ColdFire MCF547x_8x CPUs
? - mips?Files specific to MIPS CPUs
? - mpc5xx?Files specific to Freescale MPC5xx? CPUs
? - mpc5xxx?Files specific to Freescale MPC5xxx CPUs
? - mpc8xx?Files specific to Freescale MPC8xx? CPUs
? - mpc8220?Files specific to Freescale MPC8220 CPUs
? - mpc824x?Files specific to Freescale MPC824x CPUs
? - mpc8260?Files specific to Freescale MPC8260 CPUs
? - mpc85xx?Files specific to Freescale MPC85xx CPUs
? - nios?Files specific to Altera NIOS CPUs
? - nios2?Files specific to Altera Nios-II CPUs
? - ppc4xx?Files specific to AMCC PowerPC 4xx CPUs
? - pxa??Files specific to Intel XScale PXA CPUs
? - s3c44b0?Files specific to Samsung S3C44B0 CPUs
? - sa1100?Files specific to Intel StrongARM SA1100 CPUs
- disk??Code for disk drive partition handling
????????? 磁盘驱动，及分区操作的代码
- doc??? Documentation (don't expect too much)
????????? 文档（不要期待太多（搞不懂为什么了?））
- drivers?Commonly used device drivers
????????? 通用设备驱动
- dtt??? Digital Thermometer and Thermostat drivers
????????? 数字温度器及调温装置驱动
- examples?Example code for standalone applications, etc.
??????????? 独立应用程序的例子
- include?? Header Files
??????????? 头文件
- lib_arm?? Files generic to ARM? architecture
??????????? ARM体系结构通用的文件
- lib_avr32?Files generic to AVR32? architecture
- lib_generic?Files generic to all? architectures
????????????? 所有体系结构通用的文件
- lib_i386?Files generic to i386? architecture
- lib_m68k?Files generic to m68k? architecture
- 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
????????? 支持平板设备树的库文件
- net??Networking code
???????? 网络代码
- post??Power On Self Test
????????? 上电自检
- rtc??Real Time Clock drivers
????????? 实时时钟驱动
- tools??Tools to build S-Record or U-Boot images, etc.
????????? 编译S-Record和U-Boot镜像的工具
- api
????????? 1.3版本的UBOOT还增加了一个API的文件夹，
????????? 这里放的是一些扩展应用的独立的API函数
?????????
Software Configuration:
软件配置：
=======================

Configuration is usually done using C preprocessor defines; the
rationale behind that is to avoid dead code whenever possible.
配置是通过C预处理程序完成。

There are two classes of configuration variables:
有两类配置变量：

* Configuration _OPTIONS_:
? 配置选项：
? These are selectable by the user and have names beginning with
? "CONFIG_".
? 是可由用户选择并以“CONFIG_”开头

* Configuration _SETTINGS_:
? 配置设置
? These depend on the hardware etc. and should not be meddled with if
? you don't know what you're doing; they have names beginning with
? "CFG_".
? 依赖于硬件，由“CFG_”开头

Later we will add a configuration tool - probably similar to or even
identical to what's used for the Linux kernel. Right now, we have to
do the configuration by hand, which means creating some symbolic
links and editing some configuration files. We use the TQM8xxL boards
as an example here.
以后我们将加入类似Linux内核一样的配置工具。但现在只能手工配置。
我们将以TQM8XXL为例。

第一步：
Selection of Processor Architecture and Board Type:
选择处理器架构和板类型：
---------------------------------------------------

For all supported boards there are ready-to-use default
configurations available; just type "make _config".
对所有已至此的板都已经有可用的默认配置，只要执行：
make _config

下面是例子
Example: For a TQM823L module type:

?cd u-boot
?make TQM823L_config

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.
对于加强型平台还要指定CPU类型，请阅读cogent/READM

第二步
Configuration Options:
配置选项：
----------------------

Configuration depends on the combination of board and CPU type; all
such information is kept in a configuration file
配置依赖于板和CPU，所有配置设置信息保存在：
"include/configs/.h".

Example: For a TQM823L module, all configuration settings are in
"include/configs/TQM823L.h".

Many of the options are named exactly as the corresponding Linux
kernel configuration options. The intention is to make it easier to
build a config tool - later.

The following options need to be configured:
以下的选项需要被配置：
这里MPC的配置比较多，如果是SMDK2410的话配置会少很多

- CPU Type:?Define exactly one, e.g. CONFIG_MPC85XX.
CPU类型：正确地定义一个种类，比如：CONFIG_MPC85XX

- Board Type:?Define exactly one, e.g. CONFIG_MPC8540ADS.
板类型：比如：CONFIG_MPC8540ADS

- CPU Daughterboard Type: (if CONFIG_ATSTK1000 is defined)
??Define exactly one, e.g. CONFIG_ATSTK1002
CPU子类

- CPU Module Type: (if CONFIG_COGENT is defined)
??Define exactly one of
??CONFIG_CMA286_60_OLD
CPU模型
--- FIXME --- not tested yet:
??CONFIG_CMA286_60, CONFIG_CMA286_21, CONFIG_CMA286_60P,
??CONFIG_CMA287_23, CONFIG_CMA287_50

- Motherboard Type: (if CONFIG_COGENT is defined)
??Define exactly one of
??CONFIG_CMA101, CONFIG_CMA102
主板

- Motherboard I/O Modules: (if CONFIG_COGENT is defined)
??Define one or more of
??CONFIG_CMA302
主板I/O模式

- 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
?????? a "rotator" |\-/|\-/

- Board flavour: (if CONFIG_MPC8260ADS is defined)
??CONFIG_ADSTYPE
??Possible values are:
???CFG_8260ADS?- original MPC8260ADS
???CFG_8266ADS?- MPC8266ADS
???CFG_PQ2FADS?- PQ2FADS-ZU or PQ2FADS-VR
???CFG_8272ADS?- MPC8272ADS

- MPC824X Family Member (if CONFIG_MPC824X is defined)
??Define exactly one of
??CONFIG_MPC8240, CONFIG_MPC8245

- 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
?????? reference PIT/RTC clock
??CONFIG_8xx_OSCLK?- PLL input clock (either EXTCLK
?????? or XTAL/EXTAL)

- 859/866/885 CPU options: (if using a MPC859 or MPC866 or MPC885 CPU):
??CFG_8xx_CPUCLK_MIN
??CFG_8xx_CPUCLK_MAX
??CONFIG_8xx_CPUCLK_DEFAULT
???See doc/README.MPC866

??CFG_MEASURE_CPUCLK

??Define this to measure the actual CPU clock instead
??of relying on the correctness of the configured
??values. Mostly useful for board bringup to make sure
??the PLL is locked at the intended frequency. Note
??that this requires a (stable) reference clock (32 kHz
??RTC clock or CFG_8XX_XIN)

- Intel Monahans options:
??CFG_MONAHANS_RUN_MODE_OSC_RATIO

??Defines the Monahans run mode to oscillator
??ratio. Valid values are 8, 16, 24, 31. The core
??frequency is this value multiplied by 13 MHz.

??CFG_MONAHANS_TURBO_RUN_MODE_RATIO

??Defines the Monahans turbo mode to oscillator
??ratio. Valid values are 1 (default if undefined) and
??2. The core frequency as calculated above is multiplied
??by this value.

-?Linux Kernel Interface:
-?Linux内核接口
??CONFIG_CLOCKS_IN_MHZ

??U-Boot stores all clock information in Hz
??internally.
?????? UBOOT以Hz位单位存储时钟信息
For binary compatibility with older Linux
??kernels (which expect the clocks passed in the
??bd_info data to be in MHz
Linux内核期望时钟是以MHz位单位传到bd_info的)
the environment variable
为了和内核兼容可以定义环境变量
??"clocks_in_mhz" can be defined so that U-Boot
??converts clock data to MHZ before passing it to the
??Linux kernel.
?????? 把UBOOT的时钟数据转换位MHz后传入内核
??When CONFIG_CLOCKS_IN_MHZ is defined, a definition of
??"clocks_in_mhz=1" is automatically included in the
??default environment.
?????? 当CONFIG_CLOCKS_IN_MHZ被定义后clocks_in_mhz=1
会被自动包含到环境中

??CONFIG_MEMSIZE_IN_BYTES??[relevant for MIPS only]
?????? 只跟MIPS相关

??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.
?????? 对于内存大小的参数可以定义CONFIG_MEMSIZE_IN_BYTES
?????? 以BYTES位单位

??CONFIG_OF_LIBFDT

??New kernel versions are expecting firmware settings to be
??passed using flattened device trees (based on open firmware
??concepts).

??CONFIG_OF_LIBFDT
?? * New libfdt-based support
?? * Adds the "fdt" command
?? * The bootm command automatically updates the fdt

??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_BOARD_SETUP

??Board code has addition modification that it wants to make
??to the flat device tree before handing it off to the kernel

??CONFIG_OF_BOOT_CPU

??This define fills in the correct boot CPU in the boot
??param header, the default value is zero if undefined.

-?Serial Ports:
-?串口
??CFG_PL010_SERIAL

??Define this if you want support for Amba PrimeCell PL010 UARTs.
?????? 要支持Amba PrimeCell PL010 UARTs就定义此项

??CFG_PL011_SERIAL

??Define this if you want support for Amba PrimeCell PL011 UARTs.

??CONFIG_PL011_CLOCK

??If you have Amba PrimeCell PL011 UARTs, set this variable to
??the clock speed of the UARTs.

??CONFIG_PL01x_PORTS

??If you have Amba PrimeCell PL010 or PL011 UARTs on your board,
??define this to a list of base addresses for each (supported)
??port. See e.g. include/configs/versatile.h

-?Console Interface:
-?控制台接口
??Depending on board, define exactly one serial port
??(like CONFIG_8xx_CONS_SMC1, CONFIG_8xx_CONS_SMC2,
??CONFIG_8xx_CONS_SCC1, ...), or switch off the serial
??console by defining CONFIG_8xx_CONS_NONE
?????? 依赖于板，定义一个串口

??Note: if CONFIG_8xx_CONS_NONE is defined, the serial
??port routines must be defined elsewhere
??(i.e. serial_init(), serial_getc(), ...)