Messages in this thread | | | Date | Wed, 22 Nov 2006 13:50:20 +0100 (CET) | From | Wojtek Kaniewski <> | Subject | Re: [PATCH take 2] Atmel MACB ethernet driver |
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On Fri, 17 Nov 2006, Haavard Skinnemoen wrote: > Hmm...underruns as in "eth0: TX underrun, resetting buffers"?
Yes, that's the message.
> (...) > > If it's a problem with the descriptor, it would probably help to dump > out some information about the ring state, i.e. the value of > bp->tx_head and bp->tx_tail, and maybe dump all outstanding descriptors > in the ring to see if any of them look suspicious.
I've added some printk()s in underrun handler. There's still some data in the ring (tail=29, head=32), so the driver seems okay. The list of descriptors:
tx_ring[28].ctrl=0x8000850e (used=1 wrap=0 und=0 last=1) tx_ring[29].ctrl=0x900085ea (used=1 wrap=0 und=1 last=1) TAIL tx_ring[30].ctrl=0x000085ea (used=0 wrap=0 und=0 last=1) tx_ring[31].ctrl=0x0000850e (used=0 wrap=0 und=0 last=1) tx_ring[32].ctrl=0x800085ea (used=1 wrap=0 und=0 last=1) HEAD tx_ring[33].ctrl=0x8000850e (used=1 wrap=0 und=0 last=1)
Buffer addresses look fine, tx_ring[29..32].addr don't differ much from the rest.
> If it's a bus latency issue, things start to get a bit > platform-specific, so we should probably involve some more experienced > ARM people.
Looks like I'll have to wait for upstream support of 9260, because I'm new to ARM and I won't handle it by myself. Anyway thanks for your help.
Regards, Wojtek - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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