Previously, when the `proto://path` format of `bootfile` was used, the
transformed argument sent to either tftp or wget would also be stored
in `bootfile` overriding the original value set by the user.
If the first boot attempt failed for some reason, the protocol
information was stripped from `bootfile` and the second attempt would
then default to TFTP, even if the user had originally specified
`http://...`.
Therefore, store the transformed value in a separate variable.
For some reason, setexpr's parsing of regex escapes changes when this
mode is used, so we need double backslashes to fetch match groups
instead of 1. Yikes.
Fixes#724
This puts the responsibility on the user to set the appropriate static
parameters. On the plus side, we avoid requiring redundant information
when the `proto://path` format is used in `bootfile`
If we receive an option 67 (bootfile) matching http://IP/rootfs.itb,
use U-Boot's wget implementation to download the file. The web server
must listen on port 80. tftp:// is also supported.
Without a protocol prefix, assume that the bootfile should be fetched
using TFTP from ${serverip}.
- Adapt boot scripts to exepect the split FIT header/SquashFS image
layout.
- Make sure that we can boot from any kind of block device (most
importantly virtio for GNS3).
- Rename net -> dhcp as we might have more kinds of netboots in the
future (http).
Tobias Waldekranz