[ECOS]Strange behavior of rltk8139 chip

[ECOS]Strange behavior of rltk8139 chip

[jerzy dyrda]

Hi all,
I find abnormal behavior of chip  which corrupts eth driver. In receive, 
driver poll flag buffer empty and when buffer is not empty read receive 
packet header form  receive buffer. But after is last frame red, flag buffer 
empty was false and driver try read next packet ( but that was no data ) and 
lost synchronization. I add one more condition - I compare read and write 
pointer of receive buffer from chip registers.
Any similar  experience?

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Re: [ECOS]Strange behavior of rltk8139 chip

[Gary Thomas]

On Fri, 2004-08-27 at 08:41, jerzy dyrda wrote:
> Hi all,
> I find abnormal behavior of chip  which corrupts eth driver. In receive, 
> driver poll flag buffer empty and when buffer is not empty read receive 
> packet header form  receive buffer. But after is last frame red, flag buffer 
> empty was false and driver try read next packet ( but that was no data ) and 
> lost synchronization. I add one more condition - I compare read and write 
> pointer of receive buffer from chip registers.
> Any similar  experience?

Sounds like a cache issue.  Make sure that your PCI space and the memory
used by the board are not cached.

-- 
Gary Thomas <gary@mlbassoc.com>
MLB Associates


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