On Saturday, June 2, 2012, Elvis Dowson <[email protected]> wrote: > Hi, > >> On Jun 2, 2012, at 10:36 PM, Elvis Dowson wrote: >> >>> How can I debug the value of ${TARGET_ARCH} in meta-xilinx/classes/xilinx-boot.class, for the following function: >>> >>> do_export_xparam() { >>> bbnote "Replacing xparameters header to match hardware model" >>> xparam=$1 >>> if [ "${TARGET_ARCH}" == "powerpc" ]; then >>> cpu="PPC`echo ${TARGET_CPU} | tr '[:lower:]' '[:upper:]'`" >>> else >>> cpu=`echo ${TARGET_CPU} | tr '[:lower:]' '[:upper:]'` >>> fi >>> cp ${xparam} ${S}/board/xilinx/${XILINX_BOARD} >>> echo "/*** Cannonical definitions ***/ >>> #define XPAR_PLB_CLOCK_FREQ_HZ XPAR_PROC_BUS_0_FREQ_HZ >>> #define XPAR_CORE_CLOCK_FREQ_HZ XPAR_CPU_${cpu}_CORE_CLOCK_FREQ_HZ >>> #ifndef XPAR_DDR2_SDRAM_MEM_BASEADDR >>> # define XPAR_DDR2_SDRAM_MEM_BASEADDR XPAR_DDR_SDRAM_MPMC_BASEADDR >>> #endif >>> #define XPAR_PCI_0_CLOCK_FREQ_HZ 0" >> ${S}/board/xilinx/${XILINX_BOARD}/xparameters.h >>> } >> >> In the above code ${TARGET_ARCH} always evaluates to "powerpc". I just inserted ${TARGET_ARCH} in the echo statements, and saw the value in the file. >> >> Now what I can't seem to figure out is why, for the following if condition, the first branch isn't being take; the else branch is always evaluated, and the value for cpu is always set to "440" instead of "PPC440" >> >> if [ "${TARGET_ARCH}" == "powerpc" ]; then >> cpu="PPC`echo ${TARGET_CPU} | tr '[:lower:]' '[:upper:]'`" >> else >> cpu="`echo ${TARGET_CPU} | tr '[:lower:]' '[:upper:]'`" >> fi > > Changing it to use a single = , instead of == solved it, but it would help if someone could explain why. From the link below > http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_01.html > apparently, using a "=" is for strict posix compilance. > > but I fail to see why when ${TARGET_ARCH} evaluates to "powerpc", and I do a string comparision if [ "${TARGET_ARCH}" == "powerpc" ] it evaluates to false, and if [ "${TARGET_ARCH}" = "powerpc" ] evaluates to true.
What's your default she I guess its not bash > > Best regards, > > Elvis Dowson > _______________________________________________ > Openembedded-core mailing list > [email protected] > http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core >
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