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“WARNING: Caches not enabled” on AM335x u-boot

I'm building AM335xSDK 05_03_03_00 u-boot for AM335x Beaglebone. The build enviornment is Ubuntu 10.04.4 LTS. After I run u-boot on Beaglebone, I always get "WARNING: Caches not enabled", but the prebuild images don't have this warnning. Could anyone help me on this? Thank you!

prebuild iamges log:

====================================================================

U-Boot SPL 2011.09-00000-gf63b270-dirty (Nov 14 2011 - 10:37:14)
Texas Instruments Revision detection unimplemented
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img

U-Boot 2011.09-00000-gf63b270-dirty (Nov 14 2011 - 10:37:14)

I2C:   ready
DRAM:  256 MiB
No daughter card present
NAND:  HW ECC Hamming Code selected
nand_get_flash_type: second ID read did not match 10,10 against 00,10
No NAND device found!!!
0 MiB
MMC:   OMAP SD/MMC: 0
*** Warning - readenv() failed, using default environment

Net:   cpsw
Hit any key to stop autoboot:  0
SD/MMC found on device 0
reading uEnv.txt

 

my built images log:

===================================================

U-Boot SPL 2011.09 (Mar 12 2012 - 17:40:25)
Texas Instruments Revision detection unimplemented
OMAP SD/MMC: 0
reading u-boot.img
reading u-boot.img

U-Boot 2011.09 (Mar 12 2012 - 17:40:25)

I2C:   ready
DRAM:  256 MiB
WARNING: Caches not enabled
No daughter card present
NAND:  HW ECC Hamming Code selected
nand_get_flash_type: unknown NAND device: Manufacturer ID: 0x10, Chip ID: 0x10
No NAND device found!!!
0 MiB
MMC:   OMAP SD/MMC: 0
*** Warning - readenv() failed, using default environment

Net:   cpsw
Hit any key to stop autoboot:  0