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Booting from NAND not completed

Other Parts Discussed in Thread: DLPC300

A customer reports failure operation of the Lightcrafter as follows.
The failure occurs on same unit.
They have provided snapshot of debug message on J1(UART).

case 1: NAND boot failed. No display image. Frequency of the failure: 1/10.
The debug messages are,

------------------------------------------------------------------
Lightcrafter – NAND Boot
------------------------------------------------------------------
NAND_open() failed!

OR

------------------------------------------------------------------
Lightcrafter – NAND Boot
------------------------------------------------------------------
NAND_open() failed!
u-boot src=0x536D2258
nand_read block_idx=0x0536D225 page_idx=0x00000001 len=0x0002D000

case 2: NAND boot passed. No display image. Frequency of the failure: 1/30-1/40.
The debug message is,

I2CRegister.c:154 >> Error = ERR_DEVICE_FAIL
API.c:1184 >> Error = FAIL
[04 03] Error Flag : CMDH_ERROR_CMD_FAILED

Please provide a comment about above debug messages. Also provide
a suggestion what should they check.

Thank you.
Best regards,
S.Watanabe