Re: [ECOS] A clue....

[Andrew Lunn <andrew at lunn dot ch>]

On Wed, Feb 15, 2006 at 05:08:30AM -0800, Chuck McManis wrote:
> At 04:37 AM 2/15/2006, Andrew Lunn wrote:
> >Does it known its own MAC address? Where does it get it from? When it
> >sends out the ARP request what does it use for its own address?
> 
> Yes, it does. This is the bit of the log that shows the eCos target trying 
> to ARP:
> 
> ##Tx descriptor index 0 TDES 0012c090 buffer 0012c0d0
> TxEvent:  len: 0x002a
> Packet data at 0x0012c0d0
> ff ff ff ff ff ff 75 17 c7 05 04 4d 08 06 00 01 08 00 06 04 00 01 75 17 c7 
> 05 04 4d c0 a8 6e b1 6e ff 00 8a 00 8a c0 a8 6e 1e
> Padded 42 byte packet to 60 bytes
> Before TX: Desc (@0x0012c090) 80000000 00e0803c 0012c0d0 0012c0a0
>  Next (@0x0012c0a0) 00000000 00e0803c 0012c6d8 0012c0b0
> vt8235_send:END: ints at TX: 00
> 
> As you can see the destination address is FF:FF...FF but the source address 
> is 75:17:C7:05:05:4D which is the correct MAC address for the card. 

This just shows that eCos knows the MAC address. Does the card know
the MAC address? Sometimes you need to write the MAC address into a
register before it will receive any packets addressed to it.

        Andrew

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