Linux with MMU on NEEK

Hi,

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I was trying to get DHCP working because I thought maybe I was just misconfiguring something, but I am still not seeing any communication in or out of the device, so I am back to trying to debug the driver. This hardware design was working before the MMU was added. Now I get no errors or hangs, it's just not sending or receiving anything.

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So I tested 'dhclient' and don't know whether it's fortunate or unfortunate, but it sends DHCP DISCOVER packets from my NEEK. The DHCP server returns an IP address.

Of course, I encountered several bugs.

1) The compiler translates the function

memcpy (&from -> sin_addr, &ip -> ip_src, 4);

in the file '/common/packet.c' to the next machine code

0x0000aeb0 <decode_udp_ip_header+152>:    ldw    r2,0(r21)
0x0000aeb4 <decode_udp_ip_header+156>:    add    r17,r16,r19
0x0000aeb8 <decode_udp_ip_header+160>:    stw    r2,4(fp)

. Unfortunately, the address of 'from -> sin_addr' is word-aligned, so the code 'ldw r2,0(r21)' will evoke SIGBUS error. The detour is to rewrite the function as follows.

{ int i;
  unsigned char *pd = &ip -> ip_src, *ps = &from -> sin_addr;
  for (i = 0; i < 4; i++)
    *pd++ = *ps++;
}

2) Also the checksum is wrong, I only comment the code out.

//  if (usum && usum != sum) {
//      udp_packets_bad_checksum++;
//      if (udp_packets_seen > 4 &&
//          (udp_packets_seen / udp_packets_bad_checksum) < 2) {
//          note ("%d bad udp checksums in %d packets",
//            udp_packets_bad_checksum, udp_packets_seen);
//          udp_packets_seen = udp_packets_bad_checksum = 0;
//      }
//      return -1;
//  }

Maybe , the function 'checksum' has some bugs. And 'dhclient-script' is not interpreted well. Maybe we need 'bash'.

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in your altera_tse.c, you changed from using the .ndo functions to setting them somewhere else, was there a reason for that?

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I can't understand what you mean, but I think that these malfunctions are not caused by the driver.

Kazu