Re: [lwip-users] TCP Checksum errors.

[zhenfeng ren]

2008/9/20 zhenfeng ren <address@hidden>:
> 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.
Sorry!! there is NO 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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