[U-Boot-Users] u-boot debug request

Dear All I have debugged the U-BOOT 1.1.4 code many days;but no any data output from serial port;I have traced it;I find it is breaking on the second memset() function of "/lib_arm/board.c start_armboot()";why? My board config the follow list Flash : MX29LV640BBTC SDRAM : DS2516*2(64MByte 32bit) No ethernet; Please help me;
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BillDong@mxic.com.cn