[RFC] picotcp.20140530

[Sascha Hauer]

On Fri, May 30, 2014 at 01:18:33PM +0400, Antony Pavlov wrote:
> Hi All!
> 
> My new barebox with picotcp support brunch is pushed to github:
> 
>     https://github.com/frantony/barebox/tree/picotcp.20140530
> 
> For this version reworked content of Daniele Lacamera's push request
> is used (see https://github.com/frantony/barebox/pull/1).
> 
> Changes since picotcp.20140525:
> 
>   * rebased over latest barebox;
>   * the latest picotcp is used (warnings and big-endian
>     tests fixed);
>   * add picotcp dhcp client support by Daniele Lacamera
>   * qemu mips malta defconfig is dropped as barebox qemu
>     malta has no network device support (you can rebase
>     over experimental pci branch but it is very different story ...)
>   * other small fixes.

I tried this version. I still didn't get it working, but some
improvements.

What I changed is:

* call eth_send() instead of edev->send directly. This makes sure the
  carrier is initialized correctly
* implemented pico_zalloc as memalign(32, x); memset(ptr, 0 x); Some
  drivers (such as fec_imx.c I tested with) need bigger alignment for
  network packets to be able to do DMA transfers.
* move picotcp_net_init from coredevice_initcall to device_initcall.
  In my case the poller infrastructure is not available during
  coredevice_initcall and barebox crashes. Maybe the poller
  infrastructure could be made more robust here, but we don't want to
  to networking in this early stage anyway, right?
* select POLLER is missing

With this I get:

barebox at Phytec phyCORE-i.MX27:/ ifconfig eth 192.168.23.67 255.255.0.0
up
Assigned ipv4 192.168.23.67 to device eth
barebox at Phytec phyCORE-i.MX27:/ picoping 192.168.23.4
eth0: 100Mbps full duplex link detected
ARP: Destination Unreachable
ARP: Destination Unreachable
ARP: Destination Unreachable
ARP: Destination Unreachable
ARP: Destination Unreachable
 ---- Ping timeout!!!

I haven't investigated what's happening here.

Sascha

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