Re: [lwip-users] Nios II TSE MAC

[Davide Conte]

Dear Bill,
Thanks for your fast reply. I am pretty sure the Nios core is the same. 
I refer to the example "Ethernet Interface for Altera TSE and the NIOS 
II processor", "alteraTseEthernetif": I notice pointers corruption after 
line 411: ActualData = (void *)alt_remap_uncached (data, len); of 
lwip_tse_mac.c.
However I will better investigate to reproduce the fault and provide 
more information toward off there's an error in the application calling 
into lwIP as you suggest.

Thank you

/>-----Original Message-----/
> Dave,
>
> I wonder if the NIOS II core for the Stratix is different from the NIOS II
> for the Cyclone III (which is what we use).  What memory allocation are you
> referring to?  We've been shipping Cyclone III NIOS II products for almost 2
> years and have had no issues.  When I did see cache consistency problems
> with the NIOS II, it's not been with the driver but with my application
> calling into lwIP.  On the Cyclone III, cache consistency issues with SGDMA
> do lock up the processor.
>
> Bill
>
> > /-----Original Message-----/
> > /I'm using the Bill Auerbach's lwIP implementation on Nios II Development/
> > /kit Stratix II edition (rohs)./
> > /I am experiencing some problems with memory allocation: it seems that/
> > /the call alt_remap_uncached causes a sort of misalignment of dma data,/
> />so structure pointers became inconsistent. The annoying thing is that in/
> > /most cases the whole system appears to be tolerant to the fault and the/
> > /flow carries on through random memory locations but sometimes a simple/
> />call to a free makes the pointer structure to collapse and the system to/
> />go in error./
> > /best regards,/
> > /Dave/