AM32电调学习-使用Keil编译uboot
本文介绍了在Keil环境下为AT32F421芯片创建uboot工程的详细步骤。首先新建Keil_Projects目录并创建工程，然后添加正确的启动文件（需使用mdk目录下的文件以避免编译错误）。接着配置8项编译参数，包括设备选择、目标设置、输出选项等，并修改了跳转应用程序的关键代码。最后提供了完整的Keil工程文件内容，可直接复制使用。该教程帮助习惯Keil开发环境的用户快速搭建uboot工程，解
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目前的AM32的APP固件包含了keil工程，但是uboot还没看到，对于习惯使用keil的新用户，调试起来会有些不习惯，本文将简单描述怎么新建一个keil的uboot工程，以AT32F421为例。
一、新建目录
新建一个目录Keil_Projects
二、新建工程
三、添加文件
这个启动文件要用AM32\Mcu\f421\Startup\mdk里面的文件，这个才是给keil编译使用的
否则会如下报错
.\Objects\AT32F421_Uboot_PA2.sct(7): error: L6236E: No section matches selector - no section to be FIRST/LAST.
添加完后是这个样子的
四、修改编译参数
1、Device
2、Target
3、Output
4、Listing
5、User
6、C/C++
7、ASM
8、Linker
五、修改代码
static inline void jump_to_application(void)
{
__disable_irq();
bl_timer_disable();
const uint32_t app_address = MCU_FLASH_START + FIRMWARE_RELATIVE_START;
const uint32_t *app_data = (const uint32_t *)app_address;
const uint32_t stack_top = app_data[0];
const uint32_t JumpAddress = app_data[1];
// setup sp, msp and jump
#ifdef KEIL
__asm volatile(
#else
asm volatile(
#endif
"mov sp, %0 \n"
"msr msp, %0 \n"
"bx %1 \n"
: : "r"(stack_top), "r"(JumpAddress) :);
}
五、准备完成，可以编译了
六、工程文件
不想搞附件了，直接粘上工程文件文本，需要的话拷贝保存
1、AT32F421_Uboot.uvprojx
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<Project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_projx.xsd">
<SchemaVersion>2.1</SchemaVersion>
<Header>### uVision Project, (C) Keil Software</Header>
<Targets>
<Target>
<TargetName>AT32_F421_PA2</TargetName>
<ToolsetNumber>0x4</ToolsetNumber>
<ToolsetName>ARM-ADS</ToolsetName>
<pCCUsed>6190000::V6.19::ARMCLANG</pCCUsed>
<uAC6>1</uAC6>
<TargetOption>
<TargetCommonOption>
<Device>-AT32F421K8U7</Device>
<Vendor>ArteryTek</Vendor>
<PackID>ArteryTek.AT32F421_DFP.2.1.8</PackID>
<Cpu>IRAM(0x20000000,0x4000) IROM(0x08000000,0x10000) CPUTYPE("Cortex-M4") CLOCK(12000000) ELITTLE</Cpu>
<FlashUtilSpec></FlashUtilSpec>
<StartupFile></StartupFile>
<FlashDriverDll>UL2CM3(-S0 -C0 -P0 -FD20000000 -FC1000 -FN1 -FF0AT32F421_64 -FS08000000 -FL010000 -FP0($$Device:-AT32F421K8U7$Flash\AT32F421_64.FLM))</FlashDriverDll>
<DeviceId>0</DeviceId>
<RegisterFile>$$Device:-AT32F421K8U7$Device\Include\at32f421.h</RegisterFile>
<MemoryEnv></MemoryEnv>
<Cmp></Cmp>
<Asm></Asm>
<Linker></Linker>
<OHString></OHString>
<InfinionOptionDll></InfinionOptionDll>
<SLE66CMisc></SLE66CMisc>
<SLE66AMisc></SLE66AMisc>
<SLE66LinkerMisc></SLE66LinkerMisc>
<SFDFile>$$Device:-AT32F421K8U7$SVD\AT32F421xx_v2.svd</SFDFile>
<bCustSvd>0</bCustSvd>
<UseEnv>0</UseEnv>
<BinPath></BinPath>
<IncludePath></IncludePath>
<LibPath></LibPath>
<RegisterFilePath></RegisterFilePath>
<DBRegisterFilePath></DBRegisterFilePath>
<TargetStatus>
<Error>0</Error>
<ExitCodeStop>0</ExitCodeStop>
<ButtonStop>0</ButtonStop>
<NotGenerated>0</NotGenerated>
<InvalidFlash>1</InvalidFlash>
</TargetStatus>
<OutputDirectory>.\Objects\</OutputDirectory>
<OutputName>AT32F421_Uboot_PA2</OutputName>
<CreateExecutable>1</CreateExecutable>
<CreateLib>0</CreateLib>
<CreateHexFile>1</CreateHexFile>
<DebugInformation>1</DebugInformation>
<BrowseInformation>1</BrowseInformation>
<ListingPath>.\Listings\</ListingPath>
<HexFormatSelection>1</HexFormatSelection>
<Merge32K>0</Merge32K>
<CreateBatchFile>0</CreateBatchFile>
<BeforeCompile>
<RunUserProg1>0</RunUserProg1>
<RunUserProg2>0</RunUserProg2>
<UserProg1Name></UserProg1Name>
<UserProg2Name></UserProg2Name>
<UserProg1Dos16Mode>0</UserProg1Dos16Mode>
<UserProg2Dos16Mode>0</UserProg2Dos16Mode>
<nStopU1X>0</nStopU1X>
<nStopU2X>0</nStopU2X>
</BeforeCompile>
<BeforeMake>
<RunUserProg1>0</RunUserProg1>
<RunUserProg2>0</RunUserProg2>
<UserProg1Name></UserProg1Name>
<UserProg2Name></UserProg2Name>
<UserProg1Dos16Mode>0</UserProg1Dos16Mode>
<UserProg2Dos16Mode>0</UserProg2Dos16Mode>
<nStopB1X>0</nStopB1X>
<nStopB2X>0</nStopB2X>
</BeforeMake>
<AfterMake>
<RunUserProg1>0</RunUserProg1>
<RunUserProg2>0</RunUserProg2>
<UserProg1Name></UserProg1Name>
<UserProg2Name></UserProg2Name>
<UserProg1Dos16Mode>0</UserProg1Dos16Mode>
<UserProg2Dos16Mode>0</UserProg2Dos16Mode>
<nStopA1X>0</nStopA1X>
<nStopA2X>0</nStopA2X>
</AfterMake>
<SelectedForBatchBuild>0</SelectedForBatchBuild>
<SVCSIdString></SVCSIdString>
</TargetCommonOption>
<CommonProperty>
<UseCPPCompiler>0</UseCPPCompiler>
<RVCTCodeConst>0</RVCTCodeConst>
<RVCTZI>0</RVCTZI>
<RVCTOtherData>0</RVCTOtherData>
<ModuleSelection>0</ModuleSelection>
<IncludeInBuild>1</IncludeInBuild>
<AlwaysBuild>0</AlwaysBuild>
<GenerateAssemblyFile>0</GenerateAssemblyFile>
<AssembleAssemblyFile>0</AssembleAssemblyFile>
<PublicsOnly>0</PublicsOnly>
<StopOnExitCode>3</StopOnExitCode>
<CustomArgument></CustomArgument>
<IncludeLibraryModules></IncludeLibraryModules>
<ComprImg>1</ComprImg>
</CommonProperty>
<DllOption>
<SimDllName>SARMCM3.DLL</SimDllName>
<SimDllArguments> -REMAP -MPU</SimDllArguments>
<SimDlgDll>DCM.DLL</SimDlgDll>
<SimDlgDllArguments>-pCM4</SimDlgDllArguments>
<TargetDllName>SARMCM3.DLL</TargetDllName>
<TargetDllArguments> -MPU</TargetDllArguments>
<TargetDlgDll>TCM.DLL</TargetDlgDll>
<TargetDlgDllArguments>-pCM4</TargetDlgDllArguments>
</DllOption>
<DebugOption>
<OPTHX>
<HexSelection>1</HexSelection>
<HexRangeLowAddress>0</HexRangeLowAddress>
<HexRangeHighAddress>0</HexRangeHighAddress>
<HexOffset>0</HexOffset>
<Oh166RecLen>16</Oh166RecLen>
</OPTHX>
</DebugOption>
<Utilities>
<Flash1>
<UseTargetDll>1</UseTargetDll>
<UseExternalTool>0</UseExternalTool>
<RunIndependent>0</RunIndependent>
<UpdateFlashBeforeDebugging>1</UpdateFlashBeforeDebugging>
<Capability>1</Capability>
<DriverSelection>4096</DriverSelection>
</Flash1>
<bUseTDR>1</bUseTDR>
<Flash2>BIN\UL2CM3.DLL</Flash2>
<Flash3>"" ()</Flash3>
<Flash4></Flash4>
<pFcarmOut></pFcarmOut>
<pFcarmGrp></pFcarmGrp>
<pFcArmRoot></pFcArmRoot>
<FcArmLst>0</FcArmLst>
</Utilities>
<TargetArmAds>
<ArmAdsMisc>
<GenerateListings>0</GenerateListings>
<asHll>1</asHll>
<asAsm>1</asAsm>
<asMacX>1</asMacX>
<asSyms>1</asSyms>
<asFals>1</asFals>
<asDbgD>1</asDbgD>
<asForm>1</asForm>
<ldLst>0</ldLst>
<ldmm>1</ldmm>
<ldXref>1</ldXref>
<BigEnd>0</BigEnd>
<AdsALst>1</AdsALst>
<AdsACrf>1</AdsACrf>
<AdsANop>0</AdsANop>
<AdsANot>0</AdsANot>
<AdsLLst>1</AdsLLst>
<AdsLmap>1</AdsLmap>
<AdsLcgr>1</AdsLcgr>
<AdsLsym>1</AdsLsym>
<AdsLszi>1</AdsLszi>
<AdsLtoi>1</AdsLtoi>
<AdsLsun>1</AdsLsun>
<AdsLven>1</AdsLven>
<AdsLsxf>1</AdsLsxf>
<RvctClst>0</RvctClst>
<GenPPlst>0</GenPPlst>
<AdsCpuType>"Cortex-M4"</AdsCpuType>
<RvctDeviceName></RvctDeviceName>
<mOS>0</mOS>
<uocRom>0</uocRom>
<uocRam>0</uocRam>
<hadIROM>1</hadIROM>
<hadIRAM>1</hadIRAM>
<hadXRAM>0</hadXRAM>
<uocXRam>0</uocXRam>
<RvdsVP>0</RvdsVP>
<RvdsMve>0</RvdsMve>
<RvdsCdeCp>0</RvdsCdeCp>
<nBranchProt>0</nBranchProt>
<hadIRAM2>0</hadIRAM2>
<hadIROM2>0</hadIROM2>
<StupSel>8</StupSel>
<useUlib>1</useUlib>
<EndSel>0</EndSel>
<uLtcg>0</uLtcg>
<nSecure>0</nSecure>
<RoSelD>3</RoSelD>
<RwSelD>3</RwSelD>
<CodeSel>0</CodeSel>
<OptFeed>0</OptFeed>
<NoZi1>0</NoZi1>
<NoZi2>0</NoZi2>
<NoZi3>0</NoZi3>
<NoZi4>0</NoZi4>
<NoZi5>0</NoZi5>
<Ro1Chk>0</Ro1Chk>
<Ro2Chk>0</Ro2Chk>
<Ro3Chk>0</Ro3Chk>
<Ir1Chk>1</Ir1Chk>
<Ir2Chk>0</Ir2Chk>
<Ra1Chk>0</Ra1Chk>
<Ra2Chk>0</Ra2Chk>
<Ra3Chk>0</Ra3Chk>
<Im1Chk>1</Im1Chk>
<Im2Chk>0</Im2Chk>
<OnChipMemories>
<Ocm1>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</Ocm1>
<Ocm2>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</Ocm2>
<Ocm3>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</Ocm3>
<Ocm4>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</Ocm4>
<Ocm5>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</Ocm5>
<Ocm6>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</Ocm6>
<IRAM>
<Type>0</Type>
<StartAddress>0x20000000</StartAddress>
<Size>0x4000</Size>
</IRAM>
<IROM>
<Type>1</Type>
<StartAddress>0x8000000</StartAddress>
<Size>0x10000</Size>
</IROM>
<XRAM>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</XRAM>
<OCR_RVCT1>
<Type>1</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT1>
<OCR_RVCT2>
<Type>1</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT2>
<OCR_RVCT3>
<Type>1</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT3>
<OCR_RVCT4>
<Type>1</Type>
<StartAddress>0x8000000</StartAddress>
<Size>0x1000</Size>
</OCR_RVCT4>
<OCR_RVCT5>
<Type>1</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT5>
<OCR_RVCT6>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT6>
<OCR_RVCT7>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT7>
<OCR_RVCT8>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT8>
<OCR_RVCT9>
<Type>0</Type>
<StartAddress>0x20000000</StartAddress>
<Size>0x4000</Size>
</OCR_RVCT9>
<OCR_RVCT10>
<Type>0</Type>
<StartAddress>0x0</StartAddress>
<Size>0x0</Size>
</OCR_RVCT10>
</OnChipMemories>
<RvctStartVector></RvctStartVector>
</ArmAdsMisc>
<Cads>
<interw>1</interw>
<Optim>7</Optim>
<oTime>0</oTime>
<SplitLS>0</SplitLS>
<OneElfS>1</OneElfS>
<Strict>0</Strict>
<EnumInt>0</EnumInt>
<PlainCh>0</PlainCh>
<Ropi>0</Ropi>
<Rwpi>0</Rwpi>
<wLevel>3</wLevel>
<uThumb>0</uThumb>
<uSurpInc>0</uSurpInc>
<uC99>1</uC99>
<uGnu>1</uGnu>
<useXO>0</useXO>
<v6Lang>3</v6Lang>
<v6LangP>5</v6LangP>
<vShortEn>1</vShortEn>
<vShortWch>1</vShortWch>
<v6Lto>0</v6Lto>
<v6WtE>0</v6WtE>
<v6Rtti>0</v6Rtti>
<VariousControls>
<MiscControls></MiscControls>
<Define>AT32F421K8U7,USE_STDPERIPH_DRIVER, USE_PA2,KEIL</Define>
<Undefine></Undefine>
<IncludePath>..\Inc;..\mcu\f421\Inc;..\Mcu\f421\Drivers\drivers\inc;..\Mcu\f421\Drivers\CMSIS\cm4\device_support;..\Mcu\f421\Drivers\CMSIS\cm4\core_support</IncludePath>
</VariousControls>
</Cads>
<Aads>
<interw>1</interw>
<Ropi>0</Ropi>
<Rwpi>0</Rwpi>
<thumb>0</thumb>
<SplitLS>0</SplitLS>
<SwStkChk>0</SwStkChk>
<NoWarn>0</NoWarn>
<uSurpInc>0</uSurpInc>
<useXO>0</useXO>
<ClangAsOpt>1</ClangAsOpt>
<VariousControls>
<MiscControls></MiscControls>
<Define></Define>
<Undefine></Undefine>
<IncludePath></IncludePath>
</VariousControls>
</Aads>
<LDads>
<umfTarg>1</umfTarg>
<Ropi>0</Ropi>
<Rwpi>0</Rwpi>
<noStLib>0</noStLib>
<RepFail>1</RepFail>
<useFile>0</useFile>
<TextAddressRange>0x08000000</TextAddressRange>
<DataAddressRange>0x20000000</DataAddressRange>
<pXoBase></pXoBase>
<ScatterFile></ScatterFile>
<IncludeLibs></IncludeLibs>
<IncludeLibsPath></IncludeLibsPath>
<Misc></Misc>
<LinkerInputFile></LinkerInputFile>
<DisabledWarnings></DisabledWarnings>
</LDads>
</TargetArmAds>
</TargetOption>
<Groups>
<Group>
<GroupName>Src</GroupName>
<Files>
<File>
<FileName>main.c</FileName>
<FileType>1</FileType>
<FilePath>..\bootloader\main.c</FilePath>
</File>
</Files>
</Group>
<Group>
<GroupName>Drivers</GroupName>
<Files>
<File>
<FileName>at32f421_adc.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_adc.c</FilePath>
</File>
<File>
<FileName>at32f421_cmp.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_cmp.c</FilePath>
</File>
<File>
<FileName>at32f421_crc.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_crc.c</FilePath>
</File>
<File>
<FileName>at32f421_crm.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_crm.c</FilePath>
</File>
<File>
<FileName>at32f421_debug.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_debug.c</FilePath>
</File>
<File>
<FileName>at32f421_dma.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_dma.c</FilePath>
</File>
<File>
<FileName>at32f421_ertc.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_ertc.c</FilePath>
</File>
<File>
<FileName>at32f421_exint.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_exint.c</FilePath>
</File>
<File>
<FileName>at32f421_flash.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_flash.c</FilePath>
</File>
<File>
<FileName>at32f421_gpio.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_gpio.c</FilePath>
</File>
<File>
<FileName>at32f421_i2c.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_i2c.c</FilePath>
</File>
<File>
<FileName>at32f421_misc.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_misc.c</FilePath>
</File>
<File>
<FileName>at32f421_pwc.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_pwc.c</FilePath>
</File>
<File>
<FileName>at32f421_scfg.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_scfg.c</FilePath>
</File>
<File>
<FileName>at32f421_spi.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_spi.c</FilePath>
</File>
<File>
<FileName>at32f421_tmr.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_tmr.c</FilePath>
</File>
<File>
<FileName>at32f421_usart.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_usart.c</FilePath>
</File>
<File>
<FileName>at32f421_wdt.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_wdt.c</FilePath>
</File>
<File>
<FileName>at32f421_wwdt.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Drivers\drivers\src\at32f421_wwdt.c</FilePath>
</File>
</Files>
</Group>
<Group>
<GroupName>F421</GroupName>
<Files>
<File>
<FileName>eeprom.c</FileName>
<FileType>1</FileType>
<FilePath>..\Mcu\f421\Src\eeprom.c</FilePath>
</File>
</Files>
</Group>
<Group>
<GroupName>Startup</GroupName>
<Files>
<File>
<FileName>startup_at32f421.s</FileName>
<FileType>2</FileType>
<FilePath>..\Mcu\f421\Startup\mdk\startup_at32f421.s</FilePath>
</File>
</Files>
</Group>
<Group>
<GroupName>CMSIS</GroupName>
</Group>
</Groups>
</Target>
</Targets>
<RTE>
<apis/>
<components/>
<files/>
</RTE>
<LayerInfo>
<Layers>
<Layer>
<LayName>AT32F421_Uboot</LayName>
<LayPrjMark>1</LayPrjMark>
</Layer>
</Layers>
</LayerInfo>
</Project>
2、AT32F421_Uboot.uvoptx
<?xml version="1.0" encoding="UTF-8" standalone="no" ?>
<ProjectOpt xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="project_optx.xsd">
<SchemaVersion>1.0</SchemaVersion>
<Header>### uVision Project, (C) Keil Software</Header>
<Extensions>
<cExt>*.c</cExt>
<aExt>*.s*; *.src; *.a*</aExt>
<oExt>*.obj; *.o</oExt>
<lExt>*.lib</lExt>
<tExt>*.txt; *.h; *.inc; *.md</tExt>
<pExt>*.plm</pExt>
<CppX>*.cpp; *.cc; *.cxx</CppX>
<nMigrate>0</nMigrate>
</Extensions>
<DaveTm>
<dwLowDateTime>0</dwLowDateTime>
<dwHighDateTime>0</dwHighDateTime>
</DaveTm>
<Target>
<TargetName>AT32_F421_PA2</TargetName>
<ToolsetNumber>0x4</ToolsetNumber>
<ToolsetName>ARM-ADS</ToolsetName>
<TargetOption>
<CLKADS>12000000</CLKADS>
<OPTTT>
<gFlags>1</gFlags>
<BeepAtEnd>1</BeepAtEnd>
<RunSim>0</RunSim>
<RunTarget>1</RunTarget>
<RunAbUc>0</RunAbUc>
</OPTTT>
<OPTHX>
<HexSelection>1</HexSelection>
<FlashByte>65535</FlashByte>
<HexRangeLowAddress>0</HexRangeLowAddress>
<HexRangeHighAddress>0</HexRangeHighAddress>
<HexOffset>0</HexOffset>
</OPTHX>
<OPTLEX>
<PageWidth>79</PageWidth>
<PageLength>66</PageLength>
<TabStop>8</TabStop>
<ListingPath>.\Listings\</ListingPath>
</OPTLEX>
<ListingPage>
<CreateCListing>1</CreateCListing>
<CreateAListing>1</CreateAListing>
<CreateLListing>1</CreateLListing>
<CreateIListing>0</CreateIListing>
<AsmCond>1</AsmCond>
<AsmSymb>1</AsmSymb>
<AsmXref>0</AsmXref>
<CCond>1</CCond>
<CCode>0</CCode>
<CListInc>0</CListInc>
<CSymb>0</CSymb>
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