[U-Boot] sf probe failed on Intel DNV-NS platform

["Hilbert Tu(杜睿哲_Pegatron)" <Hilbert_Tu@pegatroncorp.com>]

Hi Bin,

I have just tried 'make coreboot_defconfig' and I can boot into U-Boot from Coreboot now. But "sf probe" still failed with same error:
----------------------------------------------------------
=> sf probe
Invalid bus 0 (err=-19)
Failed to initialize SPI flash at 0:0 (error -19)
----------------------------------------------------------
I saw there was uclass 72,73,74 for spi by "dm uclass" command but I cannot see any spi information from "dm tree". Do you have any idea about this?

Thanks.
-Hilbert
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