How to U-Boot from NAS?

[vicary]

I want to U-Boot my Pi via NFS.

After some Googling, I ended up with these:
1. I need to build a kernel for that. zImage or uImage.
2. Current versions of U-Boot supports zImage directly so I can pick whatever I please.
3. Uncompressed kernel image needs to be wrapped into an uImage.
4. I need DTB files along with that too.
5. According to http://elinux.org/RPi_U-Boot, U-Boot doesn't use config.txt

I have a few questions based on my current understandings.

1. How should I build an zImage, specifically for Arch on Pi model B?
2. How should I obtain a DTB file?
3. Without the config.txt, how shall I change those settings?

[moonman]

1. "make zImage" will build zimage from source
2. Dtb is compiled dts which is in kernel sources, "make dtbs" will build that
3. Uboot stores its setting in its environment, depending how you build it, you can load settings from a text file

If I were you i would just store the kernel on the sd card (you need sd card either way whether you use uboot or not) and point the kernel to nfs share with rootfs.

[vicary]

Thanks for answering.

Actually I want to see if I can put everything, including boot configs, up my NAS. So that after the initial dd to the SD card, I don't have to touch the Pi until it dies.

[WarheadsSE]

Doesn't work that way, thanks to their closed bootloader.