download kernel into ram by u-boot

Hi smalllight,

> I want to download the kernel to the sdram by u-boot.

First, create a u-boot image file with mkimage.

> how can I use the tftp in u-boot?

Try the u-boot command:

==> help tftpboot

The syntax is: tftpboot address fname

Example: download the file "foo.img" to address 0x400

==> tftpboot 400 foo.img

Then to boot the kernel:

==> bootm 400

Regards,

--Scott