[U-Boot-Users] how to initramfs

[Hurricane555]

I´m a little confused! What´s the difference between initramfs and initrd?

How can I create a runable initramfs for my linux Kernel?

Where can I found an example for a rootfs (2.6.10)?

Is a initramfs or initrd essential for a linux prompt?

Because at the moment my serial output shows only this:

U-BOOT# bootm 50040000
## Booting image at 50040000 ...
   Image Name:   NS9750 Kernel
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1074991 Bytes =  1 MB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
OK

Starting kernel ...




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