[RFC] [WIP] incorporate picotcp into barebox: a small demo

[Daniele Lacamera]

On Tue, May 27, 2014 at 7:30 AM, Sascha Hauer <s.hauer at pengutronix.de> wrote:

>> 3. ipv6
>>
>>    Current IPv4 address space is near totaly exhausted
>>    (see https://www.icann.org/news/announcement-2-2014-05-20-en).
>>    I suppose with the lapse of time IPv6 will be used even in bootloaders :)
>>    picotcp gives you IPv6 just now.
>
> These features sound very nice. I hope we can get the binary size
> impacts within sensible limits. Is it possible to disable TCP support in
> picotcp?
>

Yes, you can disable each single component. E.g., to compile TCP out,
use TCP=0, or just leave PICO_SUPPORT_TCP out. Some binary size
figures for picotcp (compiled for arm, with -Os, symbols stripped):

    1433      pico_arp.o (ex ./build/lib/libpicotcp.a)
    1715      pico_dev_loop.o (ex ./build/lib/libpicotcp.a)
    2956      pico_dhcp_client.o (ex ./build/lib/libpicotcp.a)
     284      pico_dhcp_common.o (ex ./build/lib/libpicotcp.a)
    1152      pico_dhcp_server.o (ex ./build/lib/libpicotcp.a)
    2340      pico_dns_client.o (ex ./build/lib/libpicotcp.a)
    1170      pico_icmp4.o (ex ./build/lib/libpicotcp.a)
    1897      pico_icmp6.o (ex ./build/lib/libpicotcp.a)
    3624      pico_igmp.o (ex ./build/lib/libpicotcp.a)
     660      pico_ipfilter.o (ex ./build/lib/libpicotcp.a)
    5560      pico_ipv4.o (ex ./build/lib/libpicotcp.a)
    1216      pico_ipv6_nd.o (ex ./build/lib/libpicotcp.a)
    4089      pico_ipv6.o (ex ./build/lib/libpicotcp.a)
    2476      pico_mdns.o (ex ./build/lib/libpicotcp.a)
    1428      pico_nat.o (ex ./build/lib/libpicotcp.a)
    3294      pico_olsr.o (ex ./build/lib/libpicotcp.a)
     612      pico_slaacv4.o (ex ./build/lib/libpicotcp.a)
     928      pico_sntp_client.o (ex ./build/lib/libpicotcp.a)
     766      pico_socket_tcp.o (ex ./build/lib/libpicotcp.a)
     644      pico_socket_udp.o (ex ./build/lib/libpicotcp.a)
   10542      pico_tcp.o (ex ./build/lib/libpicotcp.a)
     684      pico_udp.o (ex ./build/lib/libpicotcp.a)
    1375      pico_device.o (ex ./build/lib/libpicotcp.a)
     434      pico_frame.o (ex ./build/lib/libpicotcp.a)
     601      pico_protocol.o (ex ./build/lib/libpicotcp.a)
    2636      pico_socket_multicast.o (ex ./build/lib/libpicotcp.a)
    5018      pico_socket.o (ex ./build/lib/libpicotcp.a)
    3079      pico_stack.o (ex ./build/lib/libpicotcp.a)
    1188      pico_tree.o (ex ./build/lib/libpicotcp.a)
   63801      (TOTALS)

/d