problem using both mpc857dsl fec and scc1

[Dennis Khoo]

Hi all,

I'm having a peculiar problem.

Briefly, my platform is MPC857DSL IAD board from Motorola.  I'm using U-boot
0.4.8 to bootp the kernel(2.4.18 and 2.4.22)  through SCC1 and then load
NFS.   If I configure the kernel with only SCC1, then everything works
well(NFS works and ping through eth0 works).  If I configure the kernel with
only FEC (in fec.c PDPAR[UT]=0,UTMOD[SPLIT]=1,ENCTRL[FEC_PIN_MUX]=1), then
everything works well through FEC which is hooked up to a RealTek RTL8305S
switch.

But if I configure the kernel to use both SCC1 and FEC, SCC1 works and FEC
doesn't.  NFS and ping run well through SCC1(eth0).  But when I try to ping
out through FEC(eth1), I get ring buffer dumps and no ping response:

NETDEV WATCHDOG: eth1: transmit timed out
eth1: transmit timed out.
Ring data dump: cur_tx c1fa8100, tx_free 0, dirty_tx c1fa8100, cur_rx
c1fa8020
 tx: 16 buffers
  c1fa8100: 9c00 002a 01f868c2
  c1fa8108: 9c00 002a 01f86842
  c1fa8110: 9c00 002a 01f867c2
  c1fa8118: 9c00 002a 01f86742
  c1fa8120: 9c00 002a 01f866c2
  c1fa8128: 9c00 002a 01f86642
  c1fa8130: 9c00 002a 01f865c2
  c1fa8138: 9c00 002a 01f86542
  c1fa8140: 9c00 002a 01f864c2
  c1fa8148: 9c00 002a 01f86442
  c1fa8150: 9c00 002a 01f863c2
  c1fa8158: 9c00 002a 01f86342
  c1fa8160: 9c00 002a 01f862c2
  c1fa8168: 9c00 002a 01dafbe2
  c1fa8170: 9c00 002a 01dafb62
  c1fa8178: bc00 002a 01dafce2
 rx: 32 buffers
  c1fa8000: 8880 0252 01fa7000
  c1fa8008: 8880 0040 01fa7800
  c1fa8010: 8880 0162 01fa6000
  c1fa8018: 8880 0040 01fa6800
  c1fa8020: 8000 0000 01fa5000
  c1fa8028: 8000 0000 01fa5800
  c1fa8030: 8000 0000 01fa4000
  c1fa8038: 8000 0000 01fa4800
  c1fa8040: 8000 0000 01fa3000
  c1fa8048: 8000 0000 01fa3800
  c1fa8050: 8000 0000 01fa2000
  c1fa8058: 8000 0000 01fa2800
  c1fa8060: 8000 0000 01fa1000
  c1fa8068: 8000 0000 01fa1800
  c1fa8070: 8000 0000 01fa0000
  c1fa8078: 8000 0000 01fa0800
  c1fa8080: 8000 0000 01f9f000
  c1fa8088: 8000 0000 01f9f800
  c1fa8090: 8000 0000 01f9e000
  c1fa8098: 8000 0000 01f9e800
  c1fa80a0: 8000 0000 01f9d000
  c1fa80a8: 8000 0000 01f9d800
  c1fa80b0: 8000 0000 01f9c000
  c1fa80b8: 8000 0000 01f9c800
  c1fa80c0: 8000 0000 01f9b000
  c1fa80c8: 8000 0000 01f9b800
  c1fa80d0: 8000 0000 01f9a000
  c1fa80d8: 8000 0000 01f9a800
  c1fa80e0: 8000 0000 01f99000
  c1fa80e8: 8000 0000 01f99800
  c1fa80f0: 8000 0000 01f98000
  c1fa80f8: a000 0000 01f98800


Doing an ifconfig gives me......(TX errors continue to accumulate
indefinitely even after I stop ping)

eth0      Link encap:Ethernet  HWaddr 00:02:87:55:66:77
          inet addr:199.199.199.129  Bcast:199.199.199.255
Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:1538 errors:0 dropped:0 overruns:0 frame:0
          TX packets:698 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:1787601 (1.7 Mb)  TX bytes:102816 (100.4 kb)
          Base address:0x3c00

eth1      Link encap:Ethernet  HWaddr 00:02:87:D5:66:77
          inet addr:192.168.2.129  Bcast:192.168.2.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:5 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:1076 (1.0 kb)  TX bytes:672 (672.0 b)
          Base address:0xe00

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:21 errors:0 dropped:0 overruns:0 frame:0
          TX packets:21 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:2352 (2.2 kb)  TX bytes:2352 (2.2 kb)


Any help is deeply appreciated.

Thanks,
Dennis Khoo
Software Engineer
Adapcom, INC.


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