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-mcf5227xFilesspecifictoFreescaleColdFireMCF5227xCPUs
-mcf532xFilesspecifictoFreescaleColdFireMCF5329CPUs
-mcf5445xFilesspecifictoFreescaleColdFireMCF5445xCPUs
-mcf547x_8xFilesspecifictoFreescaleColdFireMCF547x_8xCPUs
-mipsFilesspecifictoMIPSCPUs
-mpc5xxFilesspecifictoFreescaleMPC5xxCPUs
-mpc5xxxFilesspecifictoFreescaleMPC5xxxCPUs
-mpc8xxFilesspecifictoFreescaleMPC8xxCPUs
-mpc8220FilesspecifictoFreescaleMPC8220CPUs
-mpc824xFilesspecifictoFreescaleMPC824xCPUs
-mpc8260FilesspecifictoFreescaleMPC8260CPUs
-mpc85xxFilesspecifictoFreescaleMPC85xxCPUs
-niosFilesspecifictoAlteraNIOSCPUs
-nios2FilesspecifictoAlteraNios-IICPUs
-ppc4xxFilesspecifictoAMCCPowerPC4xxCPUs
-pxaFilesspecifictoIntelXScalePXACPUs
-s3c44b0FilesspecifictoSamsungS3C44B0CPUs
-sa1100FilesspecifictoIntelStrongARMSA1100CPUs
-diskCodefordiskdrivepartitionhandling
磁盘驱动，及分区操作的代码
-docDocumentation（don'
texpecttoomuch）
文档（不要期待太多（搞不懂为什么了?
））
-driversCommonlyuseddevicedrivers
通用设备驱动
-dttDigitalThermometerandThermostatdrivers
数字温度器及调温装置驱动
-examplesExamplecodeforstandaloneapplications,etc.
独立应用程序的例子
-includeHeaderFiles
头文件
-lib_armFilesgenerictoARMarchitecture
ARM体系结构通用的文件
-lib_avr32FilesgenerictoAVR32architecture
-lib_genericFilesgenerictoallarchitectures
所有体系结构通用的文件
-lib_i386Filesgenerictoi386architecture
-lib_m68kFilesgenerictom68karchitecture
-lib_mipsFilesgenerictoMIPSarchitecture
-lib_niosFilesgenerictoNIOSarchitecture
-lib_ppcFilesgenerictoPowerPCarchitecture
-lib_sparcFilesgenerictoSPARCarchitecture
-libfdtLibraryfilestosupportflatteneddevicetrees
支持平板设备树的库文件
-netNetworkingcode
网络代码
-postPowerOnSelfTest
上电自检
-rtcRealTimeClockdrivers
实时时钟驱动
-toolsToolstobuildS-RecordorU-Bootimages,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
SoftwareConfiguration:
软件配置：
=======================
ConfigurationisusuallydoneusingCpreprocessordefines;
the
rationalebehindthatistoavoiddeadcodewheneverpossible.
配置是通过C预处理程序完成。
Therearetwoclassesofconfigurationvariables:
有两类配置变量：
*Configuration_OPTIONS_:
配置选项：
Theseareselectablebytheuserandhavenamesbeginningwith
"
CONFIG_"
.
是可由用户选择并以“CONFIG_”开头
*Configuration_SETTINGS_:
配置设置
Thesedependonthehardwareetc.andshouldnotbemeddledwithif
youdon'
tknowwhatyou'
redoing;
theyhavenamesbeginningwith
CFG_"
依赖于硬件，由“CFG_”开头
Laterwewilladdaconfigurationtool-probablysimilartooreven
identicaltowhat'
susedfortheLinuxkernel.Rightnow,wehaveto
dotheconfigurationbyhand,whichmeanscreatingsomesymbolic
linksandeditingsomeconfigurationfiles.WeusetheTQM8xxLboards
asanexamplehere.
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：
SelectionofProcessorArchitectureandBoardType:
选择处理器架构和板类型：
---------------------------------------------------
Forallsupportedboardsthereareready-to-usedefault
configurationsavailable;
justtype"
make<
board_name>
_config"
对所有已至此的板都已经有可用的默认配置，只要执行：
boare_name>
_config
下面是例子
Example:
ForaTQM823Lmoduletype:
cdu-boot
makeTQM823L_config
FortheCogentplatform,youneedtospecifytheCPUtypeaswell;
e.g."
makecogent_mpc8xx_config"
.Andalsoconfigurethecogent
directoryaccordingtotheinstructionsincogent/README.
对于加强型平台还要指定CPU类型，请阅读cogent/READM
第二步
ConfigurationOptions:
配置选项：
----------------------
ConfigurationdependsonthecombinationofboardandCPUtype;
all
suchinformationiskeptinaconfigurationfile
配置依赖于板和CPU，所有配置设置信息保存在：
"
include/configs/<
.h"
ForaTQM823Lmodule,allconfigurationsettingsarein
include/configs/TQM823L.h"
ManyoftheoptionsarenamedexactlyasthecorrespondingLinux
kernelconfigurationoptions.Theintentionistomakeiteasierto
buildaconfigtool-later.
Thefollowingoptionsneedtobeconfigured:
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
-CPUType:
Defineexactlyone,e.g.CONFIG_MPC85XX.
CPU类型：
正确地定义一个种类，比如：
CONFIG_MPC85XX
-BoardType:
Defineexactlyone,e.g.CONFIG_MPC8540ADS.
板类型：
比如：
CONFIG_MPC8540ADS
-CPUDaughterboardType:
（ifCONFIG_ATSTK1000isdefined）
Defineexactlyone,e.g.CONFIG_ATSTK1002
CPU子类
-CPUModuleType:
（ifCONFIG_COGENTisdefined）
Defineexactlyoneof
CONFIG_CMA286_60_OLD
CPU模型
---FIXME---nottestedyet:
CONFIG_CMA286_60,CONFIG_CMA286_21,CONFIG_CMA286_60P,
CONFIG_CMA287_23,CONFIG_CMA287_50
-MotherboardType:
CONFIG_CMA101,CONFIG_CMA102
主板
-MotherboardI/OModules:
Defineoneormoreof
CONFIG_CMA302
主板I/O模式
-MotherboardOptions:
（ifCONFIG_CMA101orCONFIG_CMA102aredefined）
CONFIG_LCD_HEARTBEAT-updateacharacterpositionon
theLCDdisplayeverysecondwith
a"
rotator"
|\-/|\-/
-Boardflavour:
（ifCONFIG_MPC8260ADSisdefined）
CONFIG_ADSTYPE
Possiblevaluesare:
CFG_8260ADS-originalMPC8260ADS
CFG_8266ADS-MPC8266ADS
CFG_PQ2FADS-PQ2FADS-ZUorPQ2FADS-VR
CFG_8272ADS-MPC8272ADS
-MPC824XFamilyMember（ifCONFIG_MPC824Xisdefined）
CONFIG_MPC8240,CONFIG_MPC8245
-8xxCPUOptions:
（ifusinganMPC8xxCPU）
CONFIG_8xx_GCLK_FREQ-deprecated:
CPUclockif
get_gclk_freq（）cannotwork
e.g.ifthereisno32KHz
referencePIT/RTCclock
CONFIG_8xx_OSCLK-PLLinputclock（eitherEXTCLK
orXTAL/EXTAL）
-859/866/885CPUoptions:
（ifusingaMPC859orMPC866orMPC885CPU）:
CFG_8xx_CPUCLK_MIN
CFG_8xx_CPUCLK_MAX
CONFIG_8xx_CPUCLK_DEFAULT
Seedoc/README.MPC866
CFG_MEASURE_CPUCLK
DefinethistomeasuretheactualCPUclockinstead
ofrelyingonthecorrectnessoftheconfigured
values.Mostlyusefulforboardbringuptomakesure
thePLLislockedattheintendedfrequency.Note
thatthisrequiresa（stable）referenceclock（32kHz
RTCclockorCFG_8XX_XIN）
-IntelMonahansoptions:
CFG_MONAHANS_RUN_MODE_OSC_RATIO
DefinestheMonahansrunmodetooscillator
ratio.Validvaluesare8,16,24,31.Thecore
frequencyisthisvaluemultipliedby13MHz.
CFG_MONAHANS_TURBO_RUN_MODE_RATIO
DefinestheMonahansturbomodetooscillator
ratio.Validvaluesare1（defaultifundefined）and
2.Thecorefrequencyascalculatedaboveismultiplied
bythisvalue.
-LinuxKernelInterface:
-Linux内核接口
CONFIG_CLOCKS_IN_MHZ
U-BootstoresallclockinformationinHz
internally.
UBOOT以Hz位单位存储时钟信息
ForbinarycompatibilitywitholderLinux
kernels（whichexpecttheclockspassedinthe
bd_infodatatobeinMHz
Linux内核期望时钟是以MHz位单位传到bd_info的）
theenvironmentvariable
为了和内核兼容可以定义环境变量
"
clocks_in_mhz"
canbedefinedsothatU-Boot
convertsclockdatatoMHZbeforepassingittothe
Linuxkernel.
把UBOOT的时钟数据转换位MHz后传入内核
WhenCONFIG_CLOCKS_IN_MHZisdefined,adefinitionof
clocks_in_mhz=1"
isautomaticallyincludedinthe
defaultenvironment.
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[relevantforMIPSonly]
只跟MIPS相关
Whentransferringmemsizeparametertolinux,someversions
expectittobeinbytes,othersinMB.
DefineCONFIG_MEMSIZE_IN_BYTEStomakeitinbytes.
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
Newkernelversionsareexpectingfirmwaresettingstobe
passedusingflatteneddevicetrees（basedonopenfirmware
concepts）.
*Newlibfdt-basedsupport
*Addsthe"
fdt"
command
*Thebootmcommandautomaticallyupdatesthefdt
OF_CPU-Thepropernameofthecpusnode.
OF_SOC-Thepropernameofthesocnode.
OF_TBCLK-Thetimebasefrequency.
OF_STDOUT_PATH-Thepathtotheconsoledevice
boardswithQUICCEnginesrequireOF_QEtosetUCCMAC
addresses
CONFIG_OF_BOARD_SETUP
Boardcodehasadditionmodificationthatitwantstomake
totheflatdevicetreebeforehandingitofftothekernel
CONFIG_OF_BOOT_CPU
ThisdefinefillsinthecorrectbootCPUintheboot
paramheader,thedefaultvalueiszeroifundefined.
-SerialPorts:
-串口
CFG_PL010_SERIAL
DefinethisifyouwantsupportforAmbaPrimeCellPL010UARTs.
要支持AmbaPrimeCellPL010UARTs就定义此项
CFG_PL011_SERIAL
DefinethisifyouwantsupportforAmbaPrimeCellPL011UARTs.
CONFIG_PL011_CLOCK
IfyouhaveAmbaPrimeCellPL011UARTs,setthisvariableto
theclockspeedoftheUARTs.
CONFIG_PL01x_PORTS
IfyouhaveAmbaPrimeCellPL010orPL011UARTs
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