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8148 EVM NAND boot does n't work

Hi,

I flashed u-boot to 8148 EVM NAND and set the boot mode to NAND boot. It fails to boot with the below error message:

Any idea, what is wrong?

U-Boot 2010.06 (Apr 30 2012 - 01:02:37)

TI8148-GP rev 2.1

ARM clk: 600MHz
DDR clk: 400MHz

DRAM: 2 GiB
NAND: HW ECC BCH8 Selected
NAND device: Manufacturer ID: 0x2c, Chip ID: 0xca (Micron NAND 256MiB 3,3V 16-bit)
NAND bus width 8 instead 16 bit
No NAND device found!!!
0 MiB
Using default environment

The 2nd stage U-Boot will now be auto-loaded
Please do not interrupt the countdown till TI8148_EVM prompt if 2nd stage is already flashed
Hit any key to stop autoboot: 0

no devices available
## Starting application at 0x81000000 ...