----- Original Message -----
Sent: Tuesday, May 09, 2000 11:45
AM
Subject: IP Header CRC problems
I have ported ARM-Linux to a SA-1110 based board
with 16M ram & 16M falsh with a Crystal network chip.
I used Linux-2.3.99-pre6 and wrote a device
driver for the ether chip based on the existing cs89x0 driver.
The problem is that I can ping remote system from
my board and the remote system reply to the ping. However, the network stack
rejects the IP packet based on a bad IP header CRC claculated with
ip_fast_csum() in net/ipv4/ip_input.c.
If I compare the packet on the wire against what
I pass up the IP stack, it looks the same.
So it appears that my network device driver works
OK. I am tracing through the network code to find the problem, but I cannot
imagine that I am the first/only person using the network on an ARM
system.
The weird part is that I receive & send all
ARP packets perfectly.
I would appreciete any help.
Thanks.
Here is a few screens:
=================
Starting kernel at address
c0008000...
Uncompre ............................... done, bLinux version
2.3.99-pre3-rmk3-np2
(ptruter@testlinux) (gcc version 2.95.2 19991024
(release)) #186 Tue May 9 09:51:13 PDT 2000
Architecture: Intrinsyc
Surfboard
On node 0 totalpages: 2048
zone(0): 2048 pages.
zone(1): 0
pages.
zone(2): 0 pages.
On node 1 totalpages: 2048
zone(0): 2048
pages.
zone(1): 0 pages.
zone(2): 0 pages.
Calibrating delay loop...
180.22 BogoMIPS
Memory: 8MB 8MB = 16MB total
Memory: 12852KB available
(888K code, 442K data, 8K init)
Buffer-cache hash table entries: 1024
(order: 0, 4096 bytes)
Page-cache hash table entries: 4096 (order: 2, 16384
bytes)
POSIX conformance testing by UNIFIX
Linux NET4.0 for Linux
2.3
Based upon Swansea University Computer Society NET3.039
NET4: Unix
domain sockets 1.0/SMP for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for
NET4.0
IP Protocols: ICMP, UDP, TCP
IP: routing cache hash table of 512
buckets, 4Kbytes
TCP: Hash tables configured (established 1024 bind
1024)
Starting kswapd v1.6
SA1100 serial driver version 1.2
ttyS0 on
SA1100 UART3 (irq 17)
ttyS1 on SA1100 UART1 (irq 15)
pty: 256 Unix98
ptys configured
RAMDISK driver initialized: 16 RAM disks of 8192K size 1024
blocksize
cerf89x0:cerf89x0_probe()
cerf89x0.c: (kernel 2.3.99) Russell
Nelson, Andrew Morton
eth0: cs8900 rev I found at 0xd8000300 , IRQ 11,
programmed I/O, MAC 00:d0:ca:f1:ff:2f
RAMDISK: Compressed image found at
block 0
NetWinder Floating Point Emulator V0.95 (c) 1998-1999
Rebel.com
VFS: Mounted root (ext2 filesystem).
Freeing unused kernel
memory: 8k init
Linux login:
Some Network Screens:
=================
[root@Linux /root]$ ifconfig
eth0 Link
encap:Ethernet HWaddr
00:D0:CA:F1:FF:2F
inet addr:192.168.0.232 Bcast:192.168.0.255
Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX
packets:11 errors:0 dropped:0 overruns:0
frame:0
TX packets:0
errors:0 dropped:0 overruns:0
carrier:0
collisions:0
txqueuelen:100
Interrupt:11 Base address:0x300
[root@Linux /root]$ arp
-av
? (192.168.0.25) at 00:10:4B:33:83:36 [ether] on
eth0
Entries: 1 Skipped:
0 Found: 1
