[U-Boot] [RFC PATCH 0/2] Initial IPv6 support

[Chris Packham]

Here's something simple to get started. IP6addr_t is added as a typedef
(for consistency with IPaddr_t). I ended up borrowing and adapting the
vsprintf code from Linux.

Here is an example of the printf formatting

With this code

  IP6addr_t addr6 = {.u6_addr16[0] = 0x3ffe,
                     .u6_addr16[1] = 0x1234,
                     .u6_addr16[7] = 0x0001};
  IPaddr_t addr4 = 0x7f000001;

  printf("addr6=%pi6\n", &addr6);
  printf("addr6=%pI6\n", &addr6);
  printf("addr6=%pI6c\n", &addr6);
  printf("addr=%pI4\n", &addr4);

We get the output

  addr6=3ffe1234000000000000000000000001
  addr6=3ffe:1234:0000:0000:0000:0000:0000:0001
  addr6=3ffe:1234::1
  addr4=127.0.0.1

My work so far on this has raised a few questions:

1) Presumably the majority of the actual V6 code would be included by a
config option (CONFIG_IPV6). How far should I take that? Should the
vsprintf code be conditional?

2) Our current out of tree code parallels net.c and net.h. Should I
continue this for the final version or integrate it into net.[ch]. 

3) rxhand_f currently takes an IPaddr_t. I haven't looked at the usage
of this yet but to support V6 this may need to be a new union or a void
*.

(note on my split personality, I use a gmail account to post to the
u-boot mailing list but since this work is being done as part of my
$dayjob the author and s-o-b are using my work email address)


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