Virtex TEMAC 1000Mb/s trouble, but 100b/s is working

[alex_snippet]

Hi all!

I'm porting Linux for custom board based on Virtex4 FX, vanilla kernel
2.6.22.5 , Xilinx EDK 9.1 BSP, 
ELDK41 - cross-compiler 
target nfs-root pointed to ELDK41/ppc_4xx

Kernel command line:
Linux/PPC load: root=/dev/nfs rw console=ttyS0,9600
nfsroot=192.168.0.1:/target
ip=on

All work successfully was done, i tested all at 100Mb's connection speed,
but yesterday my customer said that with 1Gbit connection it did't work :(
end of log following:

    3.341532] eth0: XTemac: Options: 0xb8f2
[   11.855386] eth0: XTemac: We renegotiated the speed to: 1000
[   11.923237] eth0: XTemac: speed set to 1000Mb/s
[   13.000064] Sending DHCP requests ......, OK
[   65.484075] IP-Config: Got DHCP answer from 0.0.0.0, my address is
192.168.0.
192
[   65.573684] IP-Config: Complete:
[   65.610416]       device=eth0, addr=192.168.0.192, mask=255.255.255.0,
gw=192
.168.0.1,
[   65.705572]      host=192.168.0.192, domain=, nis-domain=(none),
[   65.777872]      bootserver=0.0.0.0, rootserver=192.168.0.1, rootpath=
[   65.861982] Looking up port of RPC 100003/2 on 192.168.0.1
[   65.929093] Looking up port of RPC 100005/1 on 192.168.0.1
[   66.024134] VFS: Mounted root (nfs filesystem).
[   66.079160] Freeing unused kernel memory: 104k init
[   71.640314] nfs: server 192.168.0.1 not responding, still trying
[   76.040311] nfs: server 192.168.0.1 not responding, still trying

Load process was friezed at this point. When connection speed is 100Mb/s
everything is ok.

Please advise me what to do, i tried to increase ppc core frequency from 100
to 300 MHz - the same problem. 
When i'm using virtual machine instead of real hardware it's working on
1000Gb/s :) but isn't on real hardware.
I'm using Fedora 7 as a host.
May be there are some nfs-demon settings?

My MHS file fragment:

BEGIN hard_temac
 PARAMETER INSTANCE = hard_temac_0
 PARAMETER HW_VER = 3.00.b
 PARAMETER C_PHY_TYPE = 1
 PARAMETER C_EMAC1_PRESENT = 0
 BUS_INTERFACE V4EMACDST0 = V4EMAC0
 PORT GMII_TXD_0 = GMII_TXD0
 PORT GMII_TX_EN_0 = GMII_TX_EN0
 PORT GMII_TX_ER_0 = GMII_TX_ER0
 PORT GMII_TX_CLK_0 = GMII_TX_CLK0
 PORT GMII_RXD_0 = GMII_RXD0
 PORT GMII_RX_DV_0 = GMII_RX_DV0
 PORT GMII_RX_ER_0 = GMII_RX_ER0
 PORT GMII_RX_CLK_0 = GMII_RX_CLK0
 PORT MDC_0 = MDC0
 PORT MDIO_0 = MDIO0
 PORT GTX_CLK_0 = GTX_CLK0
 PORT MII_TX_CLK_0 = MII_TX_CLK0
 PORT RESET = Emac_Reset
 PORT REFCLK = sys_clk_s
END

BEGIN plb_temac
 PARAMETER INSTANCE = TriMode_MAC_GMII
 PARAMETER HW_VER = 3.00.a
 PARAMETER C_BASEADDR = 0x81200000
 PARAMETER C_HIGHADDR = 0x8120ffff
 PARAMETER C_MAC_FIFO_DEPTH = 64
 PARAMETER C_RX_DRE_TYPE = 0
 PARAMETER C_TX_DRE_TYPE = 0
 PARAMETER C_DMA_TYPE = 1
 PARAMETER C_PLB_CLK_PERIOD_PS = 10000
 BUS_INTERFACE MSPLB = plb
 BUS_INTERFACE V4EMACSRC = V4EMAC0
 PORT IP2INTC_Irpt = TEMAC_Interrupt
 PORT Emac_Reset = Emac_Reset
 PORT PhyResetN = PhyResetN
END

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