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WEC7 on EVM (AM3715) Boot problems

Other Parts Discussed in Thread: AM3715

Hello,


I'm trying to get WEC7 (WinCE7) working on my board.Custom board based on EVM reference board (AM3715 CPU), with 512MB instead of 256mb
I try to boot from SD (and ignore NAND for now as it is 8bit instead of 16bit as on the reference board).SD card contains MLO, EBOOTSD.nb0 and NK.bin


After boot I get the following over uart:
Texas Instruments Windows CE SD X-Loader for EVM 3730
Built Aug  4 2011 at 12:28:13
Version BSP_WINCE_ARM_A8 2.00.00.02
open ebootsd.nb0 file
Init HW: controller RST
SDCardInit: No media found!
BLSDCardDownload:  fileio init failed
SD boot failed to open file

HALT


Any help will be greatly appreciated.
regards,
Arthur