[meta-xilinx] ramdisk format for booti command in u-boot

[Giordon Stark]

Hi all,

Initially, I tried the bootm command, and found the Image format to be
incorrect.. so then I switched to the booti command, and I get this:

> booti 0x200000 0x7000000 0x1000000
Bad Linux ARM64 Image magic!


I do something like the following to set things up:

> setenv ip no
> setenv autoload no
> setenv serverip 192.168.1.100
> dhcp
> tftpboot 0x200000 Image
> tftpboot 0x7000000 zynq-base-gfex-prototype3.tar.gz
> tftpboot 0x1000000 gfex-prototype3.dtb

Three questions:

1) Is there a different image format I should be using? If so, what is it?
2) are the addresses here arbitrary?
3) if I run without the initrd (passing '-' as the second parameter
instead), it gets to a point where it cannot open a root device (we have no
working SD card):
https://gist.github.com/kratsg/b5630a23aa3b71161da833fcad07eaaf - how to
fix this? Having `bootargs=boot=ram0` or something similar did not work.

Thanks,

Giordon
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