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EVMK2GX: Always stuck at BMC> prompt, boot complete, cannot load uboot,linux, WHY?

Part Number: EVMK2GX

Hello,

On K2G EVM board, I inserted SD card, connect USB serial then I can capture below serial log, but system stuck here, no further load uboot, application, why? 

BMC VERSION 0.6.1.0
BUILT Apr 11 2016 12:19:52
---------------------

[00:00:00] BMC Init Begin
[00:00:00] BMC Version 0.6.1.0
[00:00:00] K2G-EVM
[00:00:00] Rev 1.5.D
[00:00:00] S/N:46194P540155
[00:00:00] Dip Switches read: 0x7
[00:00:00] BMC Init Complete
[00:00:00] Main PWR Start Begin
[00:00:00] Main PWR Start Complete
[00:00:00] SOC PWR Start Begin
[00:00:00] PMIC Init Begin
[00:00:00] PMIC Init Complete
[00:00:00] SOC PWR Start Complete
[00:00:00] Setup Clk Generation
[00:00:00] Clock Source: INTERNAL
[00:00:00] ClkGen Start Begin
[00:00:00] ClkGen Start Complete
[00:00:00] CDCM ClkGen Start Begin
[00:00:00] Testing register 0 of clock 1... 0x0045, got 0x0045 Passed.
[00:00:00] Testing register 1 of clock 1... 0x0000, got 0x0000 Passed.
[00:00:00] Testing register 2 of clock 1... 0x0018, got 0x0018 Passed.
[00:00:00] Testing register 3 of clock 1... 0x00F9, got 0x00F9 Passed.
[00:00:00] Testing register 4 of clock 1... 0x30EF, got 0x30EF Passed.
[00:00:00] Testing register 5 of clock 1... 0x0001, got 0x0001 Passed.
[00:00:00] Testing register 6 of clock 1... 0x0018, got 0x0018 Passed.
[00:00:00] Testing register 7 of clock 1... 0x0122, got 0x0122 Passed.
[00:00:00] Testing register 8 of clock 1... 0x0004, got 0x0004 Passed.
[00:00:00] Testing register 9 of clock 1... 0x4002, got 0x4002 Passed.
[00:00:00] Testing register 10 of clock 1... 0x0180, got 0x0180 Passed.
[00:00:00] Testing register 11 of clock 1... 0x0000, got 0x0000 Passed.
[00:00:00] Testing register 12 of clock 1... 0x40D2, got 0x40D2 Passed.
[00:00:00] Testing register 13 of clock 1... 0x0180, got 0x0180 Passed.
[00:00:00] Testing register 14 of clock 1... 0x0000, got 0x0000 Passed.
[00:00:00] Testing register 15 of clock 1... 0x0002, got 0x0002 Passed.
[00:00:00] Testing register 16 of clock 1... 0x0010, got 0x0010 Passed.
[00:00:00] Testing register 17 of clock 1... 0x0000, got 0x0000 Passed.
[00:00:00] Testing register 18 of clock 1... 0x001B, got 0x001B Passed.
[00:00:00] Testing register 19 of clock 1... 0x0040, got 0x0040 Passed.
[00:00:00] Testing register 20 of clock 1... 0x0000, got 0x0000 Passed.
[00:00:00] Reading register 21 of clock 1... 0x0005
Clock Ref is SECONDARY of clock 1
[00:00:00] Clock 1
[00:00:00] Reading register 21 of clock 1... 0x0001
[00:00:00] Passed
[00:00:00] CDCM ClkGen Start Complete
[00:00:00] BootMode : MMC/SD Boot
[00:00:00] BOOTMODE ON set to 0 Begin
[00:00:00] SOC RST Begin
[00:00:01] SOC RST Complete
[00:00:01] BOOTMODE ON set to 1 Complete
[00:00:01] BOOT COMPLETE
BMC>