Hello everyone,
I'm using the TCP/IP stack in a standalone fashion (i.e. without the RTX OS). The code works when I adapted from an example LEDswitch project. However, when I tried to integrated into my existing project, I'm getting linker errors:
Rebuild target 'SAM9G20 Ext SDRAM' assembling SAM9G20.s... compiling EMAC_SAM9G20_Micrel.c... compiling LEDSwitch.c... compiling Net_Config.c... compiling Net_Debug.c... linking... .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol init_TcpNet multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol main_TcpNet multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol timer_tick multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol localm multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol sys_control multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol get_rnd32 multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol __RL_TCP_VER multiply defined (by at_system.o and at_system.o). .\Ext_SDRAM\Blinky.axf: Error: L6200E: Symbol $$TCPnet$$version multiply defined (by at_system.o and at_system.o). Target not created
I thought I'm linking the libraries from different places but I can't seem to find where. I'm linking to TCP_ARM_L.lib and TCPD_ARM_L.lib at C:\Keil\ARM\RV31\LIB\ which is the default install directory. I'm including my own copies of Net_Config.c and Net_Debug.c.
My compiler options are set as:
-c --cpu ARM926EJ-S -D__MICROLIB -g -O0 --apcs=interwork -I.\at91lib -I C:\Keil\ARM\RV31\Inc -I C:\Keil\ARM\CMSIS\Include -I C:\Keil\ARM\Inc\Atmel\SAM9G20 -Dkeil -o ".\Ext_SDRAM\*.o" --omf_browse ".\Ext_SDRAM\*.crf" --depend ".\Ext_SDRAM\*.d"
My assembler options are set as:
--cpu ARM926EJ-S -g --apcs=interwork --pd "__MICROLIB SETA 1" -I C:\Keil\ARM\RV31\Inc -I C:\Keil\ARM\CMSIS\Include -I C:\Keil\ARM\Inc\Atmel\SAM9G20 --pd "SIZE_EXT_INFO SETA 1" --pd "NO_EBI_INIT SETA 1" --pd "NO_SDRAM_INIT SETA 1" --pd "NO_PMC_INIT SETA 1" --pd "VEC_TO_RAM SETA 1" -o "*.o" --depend "*.d"
My linker options are set as:
--cpu ARM926EJ-S *.o --library_type=microlib --strict --scatter ".\Ext_SDRAM\Blinky.sct" --summary_stderr --info summarysizes --map --xref --callgraph --symbols --info sizes --info totals --info unused --info veneers --list ".\Ext_SDRAM\Blinky.map" -o .\Ext_SDRAM\Blinky.axf
Does anyone has any insight as to what the problem might be? Thanks!
Lei Zong
Two instances of at_system in your project, or libraries.
That's my guess as well, but I'm not sure what this library is. I searched for at_system and can't find it included anywhere. I've been working on this project for a while and just started having this problem when I tried to include the TCP/IP stack, and from the look of the symbols reported in the errors, I'm guessing it's related to the TCP_ARM_L.lib and TCPD_ARM_L.lib that I'm including.
Do you know how I can trace the multiple instances of the at_system library? I tried to use the --verbose option, but didn't get any output. I'm using MDK 4.54 with toolchain versions 4.1.0.894.
Thanks for the quick response.
Lei
"I'm linking to TCP_ARM_L.lib and TCPD_ARM_L.lib"
Isn't one of these the debug version? Why do you need both?
ha! You are right, one of them is the debug version of the TCP/IP stack. I copied it over from the example LEDswitch project since it has a release target and a debug target and didn't realize that I'm including the two variants of the same library. After I removed one instance of the library, it linked fine.
But then I'm not sure what black magic the example project did to include both libraries...
Thanks a lot for the pointer!!
You can set options for individual files - so one file is only used in a specific build. Another only used in a different build.
Could be release/debug.
Or could be a hw layer file that depends on if you build for hw 1 or hw 2 or hw2 rev 2.