[U-Boot] [PATCH 0/3] Net Boot Controller

[Stefano Babic <sbabic@denx.de>]

On 11/16/2010 07:04 PM, tristan.lelong at blunderer.org wrote:
> From: Tristan Lelong <tristan.lelong@blunderer.org>
> 
> This patch allow to interrupt u-boot autoboot from remote PC and auto-reconfigure a netconsole redirected to this remote PC
> 
> Tristan Lelong (3):
>   Add support for Net Boot Controller (NBC) packet
>   Add sendnbc tool to broadcast NBC magic packet
>   Add the NBC + netconsole corresponding documentation
> 

Hi Tristan,

>  common/main.c         |    5 +
>  doc/README.netconsole |   66 +++++++++++++++
>  include/net.h         |    6 +-
>  net/Makefile          |    2 +
>  net/nbc.c             |  143 ++++++++++++++++++++++++++++++++
>  net/nbc.h             |   39 +++++++++
>  net/net.c             |   17 ++++
>  tools/Makefile        |    6 ++
>  tools/sendnbc.c       |  219 +++++++++++++++++++++++++++++++++++++++++++++++++
>  9 files changed, 502 insertions(+), 1 deletions(-)
>  create mode 100644 doc/README.netconsole
>  create mode 100644 net/nbc.c
>  create mode 100644 net/nbc.h
>  create mode 100644 tools/sendnbc.c

Is NBC a standard ? Could you provide a link describing this protocol ?

I am quite confuse, this seems a way to replace DHCP in a simplest form
to set up the ip address using some sort of knocking-port. As additional
feature, the

Why cannot we reach the same result using the "Vendor Specific
Information" (or another option field) of DHCP answer ? You can set
there some infos that the target could understand.

It seems to me that the first packet is always sent to the broadcast
address. What happens if we have two boards on the network, both waiting
in autoboot ? Do they obtain the same ip address ?

Best regards,
Stefano Babic

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