Re: [microblaze-uclinux] Questions about the Ethernet interface

[John Williams <jwilliams@itee.uq.edu.au>]

Peter Ryser wrote:
> Are MB caches on or off? Did you try to turn caches off (I know it's 
> slow but maybe it's a cache related problem)?

I've got caches off for debugging.

It's a very subtle problem - looking now more like an alignment/bitfield 
issue - the ip version and header length fields are 4 bits each, packed 
into an unsigned char in the iphdr struct.

i've inserted a full packet dump into the ip_input code, it's physically 
receiving the packet fine, yet when querying the iphdr is seeing the 
ip_version as 0, instead of 4, so discarding the packet.

yet - when i run a packet through precisely the same code, but via the 
loopback device instead of emac, it works fine - packet contents dump 
the same, but in that instance, the bitfield is read correctly.

anyway, i'll keep chipping away.

john

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