On 23/11/2011 11:58, Mathias Adam wrote: > Hi Stefano, > Hi Matthias,
> > Just tried that: unfortunately it still doesn't work. > > However, the problem I encountered is not that $dnsip wouldn't get set, > this part worked correctly out of the box. Ok, thanks to clarify this point. > But then, the dns command > doesn't perform an ARP query to get the MAC address of the machine with IP > $dnsip but instead uses whatever MAC address is stored in NetServerEther. Understood, I see now. The main problem is that the MAC address is already stored, and because there is not an ARP cache we cannot identify which is the correct IP address. > As mentioned before, I found that tftpboot does make an ARP query and > stores the result in NetServerEther. In fact, when I start a "dummy" tftp > access dns works, at least one time: Ok, ARP does not return a valid MAC and the stored MAXC address is removed. I see now. Then we should clear the MAC address before a DNS query to force an ARP request. >>> Forcing ARP queries before DNS fixed this (see patch below). >> >> I do not think this is correct. > > hmm, not sure about u-boot, but generally I think it is a good idea to do > an ARP query before sending packets to some IP address ;-) Sorry, it was not so clear to me after the first e-mail which was the issue, and I was supposed u-boot does not take the DHCP option for DNS, not setting the dnsip variable. Now that the issue is clear and we agree on the solution, can you supply a well-formed patch as requested by Wolfgang to be merged into mainline ? Best regards, Stefano Babic -- ===================================================================== DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 Email: off...@denx.de ===================================================================== _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
