* [ECOS] problems with rltk8139 driver
@ 2004-08-23 14:41 jerzy dyrda
2004-08-24 7:52 ` Andrew Lunn
0 siblings, 1 reply; 2+ messages in thread
From: jerzy dyrda @ 2004-08-23 14:41 UTC (permalink / raw)
To: ecos-discuss
Hi all,
I've a custom board based on XScale IXP425. I'm in the process of porting
rltk8139 driver on this board. Sending data are ok ( I use ethereal to
check), but receive fail. In receive buffer (rltk8139_eth0_rx_ring) miss a
few data -about first 20 bytes. In this data should be a receive packet
header, because it is zero driver doesn't receive more. Rltk8139_eth0_rx_ring
is allocated in cached memory but all reading are done by uncached memory
(MMU translate address). I check up on either memory region - it's the same.
I think this is not a problem of memory coherency ( I use
HAL_DCACHE_INVALIDATE macro and result is the same). It seems to me that chip
doesn't copy all datas.
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^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [ECOS] problems with rltk8139 driver
2004-08-23 14:41 [ECOS] problems with rltk8139 driver jerzy dyrda
@ 2004-08-24 7:52 ` Andrew Lunn
0 siblings, 0 replies; 2+ messages in thread
From: Andrew Lunn @ 2004-08-24 7:52 UTC (permalink / raw)
To: jerzy dyrda; +Cc: ecos-discuss
On Mon, Aug 23, 2004 at 04:41:46PM +0200, jerzy dyrda wrote:
> Hi all,
> I've a custom board based on XScale IXP425. I'm in the process of
> porting rltk8139 driver on this board. Sending data are ok ( I use
> ethereal to check), but receive fail. In receive buffer
> (rltk8139_eth0_rx_ring) miss a few data -about first 20 bytes. In
> this data should be a receive packet header, because it is zero
> driver doesn't receive more. Rltk8139_eth0_rx_ring is allocated in
> cached memory but all reading are done by uncached memory (MMU
> translate address). I check up on either memory region - it's the
> same. I think this is not a problem of memory coherency ( I use
> HAL_DCACHE_INVALIDATE macro and result is the same). It seems to me
> that chip doesn't copy all datas.
It seems strange it does not copy the beginning of the packet. I would
read the data sheet about DMA. Is any specific alligment needed? eg on
8 / 16 / 32 byte boundaries? Also take a look backwards. See if the
whole packet is there but offset by 20 bytes. This seems unlikely
because this would probably corrupt the data structures and you would
get a crash.
You say the memory is allocated in cached memory. Check what values
are programmed into the ethernet chip. Cached or none cached.
Andrew
--
Before posting, please read the FAQ: http://ecos.sourceware.org/fom/ecos
and search the list archive: http://ecos.sourceware.org/ml/ecos-discuss
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