OMAP-L137 EVM: Fail to initialize SPI flash at 0:0

Hi,

I'm using Spectrum Digital EVM for OMAP-L137. The PSP version is DaVinci-PSP-SDK-03.20.00.14

I'm trying to boot Linux kernel from SPI flash by following the wiki page:

http://processors.wiki.ti.com/index.php/Booting_Linux_kernel_using_U-Boot#SPI_Flash

When I type the command "sf probe 0" on u-boot prompt, it shows "Fail to initialize SPI flash at 0:0"

I have set the boot switch(sw2) 7,2,1,0,3 as OFF,ON,OFF,ON,OFF.

My EVM is not connect to a network with a DHCP server, so I set ip = off.

Please help me with it, thank you!

Ming