Re: [lwip-users] TCP Checksum errors.

[zhenfeng ren]

2008/9/20 Nick Thomas <address@hidden>:
>
> Hi,
>
> I know this isn't much to go on, but I think I am getting TCP checksum
> errors.
>
> I am using an ST7101 chip, running OS21.
>
> I have got much of the LWIP stack running, DHCP works and DNS resolution is
> fine (I think both of these use UDP).
>
> But, the httpd example is giving wireshark some TCP Checksum errors, and the
> PC based browsers doesn't get the response from the HTTP GET request.
>
> Now, because anything using the UDP half of the transport layer seems fine,
> I am assuming that I have a problem somewhere in the TCP half, specifically
> in the checksum calcs.
>
> I have read elsewhere on these lists that there may be some hardware level
> checksum calcs happening, I need to read my docs to see if that is being
> enabled on my chip.
I think that  there is  some hardware level checksum calcs on Sti7109.
If you use the STMAC
on it . Checksum must be cal by CPU.
Why not use the gdb to see what happens in LwIP?
> Do the above sound like reasonable assumptions?
>
>
>
> Help/comments/advice appreciated.
>
> Regards
>
> Nick
>
> -----------------------------
> Nick Thomas
> Email: address@hidden
>
>
>
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