Little Endian ARM fails on 1st TCP datagram
gds at chartertn.net
Mon Aug 18 03:49:49 UTC 2008
I am trying to bring up a new ARM bsp. ARP is working but when any TCP
packet comes in it is dropped. With netdemo I see a TCP error:
"Bad offset in TCP header"
This is referring to the 4 bit header length field in the TCP header.
Looking at the code with that parses this field, it either assumes big
or little endian, depending on a BYTE_ORDER macro. It seems to be
looking at it as big endian but my processor is definitely little.
I am not sure where this is actually set. Looking around, it seems to
depend on a defined value __ARMEL__ or __ARMEB__ which I can't find
defined anywhere in the RTEMS tree.
I did find a couple of mailing list threads that mention what seems like
this problem, such as this:
But it clains it is fixed in newlib-1.13 and rtems4.8 uses 1.15. So I am
not sure if the problem has come back or was never really fixed or I am
doing something else wrong.
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