[yocto] dd to nand flash chip?

[Riko Ho]

Dear Yocto Team Members，

I tried to dd *.wic to nand flash but always got kernel panic, it can not
find rootfs
when I dd the same file to sd card, it worked.

I copy only *.wic file to usb drive n dd it.
Do I need the whole directory of images for dd? or I need hddimg?

Regards,
Riko
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