Problem with TCP socket on RTEMS 4.8.1 (ARM BSP)

[Alex Zolotov]

I have a simple rtems server-application, that is waiting for connection
with telnet client.
It's working ok with RTEMS 4.7.99.1.
But after compiling with 4.8.1 my application is not working correctly
anymore. It still can send/receive UDP packets and answer on pings without
problems. But external telnet-client can't establish connection with this
app.

**********************************************************************************************
There is source:
(program hangs on accept(...) function)

/* create TCP socket */
s = socket( AF_INET, SOCK_STREAM, 0 );
if( s < 0 ) ERROR;

/* bind to the port */
memset( &sa, 0, sizeof(sa) );
sa.sin_family = AF_INET;
sa.sin_port = htons( 23 );
sa.sin_addr.s_addr = htonl( INADDR_ANY );
if( bind( s, (struct sockaddr *)&sa, sizeof( sa ) ) < 0 ) ERROR;

/* start listening */
if( listen( s, 1 ) < 0 ) ERROR;
struct sockaddr_in sa2;
socklen_t addr_len;
int s2;
while( 1 )
{
    addr_len = sizeof( sa2 );
    memset( &sa2, 0, addr_len );
    s2 = accept( s, (struct sockaddr*)&sa2, &addr_len );
    ....
    ....
}

...

/*
 * Network configuration
 */
extern void rtems_bsdnet_loopattach();
static struct rtems_bsdnet_ifconfig loopback_config =
{
    "lo0",                      /* name */
    (int (*)(struct rtems_bsdnet_ifconfig *, int))rtems_bsdnet_loopattach,
    NULL,                       /* link to next interface */
    "127.0.0.1",                /* IP address */
    "255.0.0.0",                /* IP net mask */
};
static struct rtems_bsdnet_ifconfig eth0_config =
{
    RTEMS_BSP_NETWORK_DRIVER_NAME,      /* name */
    RTEMS_BSP_NETWORK_DRIVER_ATTACH,    /* attach (ARM EMAC) */
    &loopback_config,                   /* link to next interface */
    MODULE_IP_ADDR0,                    /* IP address */
    "255.255.255.0",                    /* IP net mask */
    ethernet_address0,                  /* Ethernet hardware address */
    0, 0, 0, 0, 0, 0, 0, NULL
};
struct rtems_bsdnet_config rtems_bsdnet_config =
{
    &eth0_config,
    NULL,
    0,
    256 * 1024,
    256 * 1024,
    NULL,
    NULL,
    NULL,
    NULL,
    {NULL},
    {NULL}
};
**********************************************************************************************

Debug messages in ethernet driver tells me, that rtems receiving all packets
correctly.

After enabling rtems libnetworking debug messages (#define TCPDEBUG in
cpukit/libnetworking/opt_tcpdebug.h) i see following:
???????? drop 0 at 0, urp=0
???????? drop 0 at 0, urp=0
???????? drop 0 at 0, urp=0
But, what is it mean? :)

Thanks for help.
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