hi dgi thanks 
first i want to say i tested psu with multimeter on 1.5 ampere which is maximum output for this psu it gives me 11.5voltage which is ok on 12volt psu adapter
hmm i would say yes tftping is work and i did send firmware in ram but now i got some problems
1-i dont know i used correct image i used this image from this link is it initramfs ? :
https://archive.openwrt.org/chaos_calmer/15.05/lantiq/xrx200/openwrt-15.05-lantiq-xrx200-TDW8970-uImage
2-i dont know if i used correct commands ??
3-btw i sent above image to ram to its uboot default address and other address this is the results:
First Attempt :
8192 KiB EN25Q64 at 0:3 is now current device
Using vr9 Switch device
TFTP from server 192.168.1.100; our IP address is 192.168.1.1
Filename 'openwrt-15.05-lantiq-xrx200-TDW8970-uImage'.
Load address: **0x80800000 // its default address in uboot senenv results**
Loading: ##################################################################################
#################################################################################
Bytes transferred = 1513470 (1717fe hex)
done
VR9 # bootm
Uncompressing ... LZMA: uncompress or overwrite error 1 - must RESET board to recover
VR9 # bootm
Uncompressing ... LZMA: uncompress or overwrite error 1 - must RESET board to recover
VR9 # bootm
Uncompressing ... LZMA: uncompress or overwrite error 1 - must RESET board to recover
VR9 # bootm
Uncompressing ... LZMA: uncompress or overwrite error 1 - must RESET board to recover
second attempt :
`changed 0x80800000 address to 0x80C71B00 ( mybe working ?!) result is same as above so not working
Third attempt :
only for one time it worked somehow!!! but it didnt fully loaded 
VR9 # tftpboot 0x81000000 openwrt-15.05-lantiq-xrx200-TDW8970-uImage
8192 KiB EN25Q64 at 0:3 is now current device
Using vr9 Switch device
TFTP from server 192.168.1.2; our IP address is 192.168.1.1
Filename 'openwrt-15.05-lantiq-xrx200-TDW8970-uImage'.
Load address: 0x81000000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
####################################
done
Bytes transferred = 1513470 (1717fe hex)
VR9 # bootm
Uncompressing ...
Starting kernel ...
[ 0.000000] Linux version 3.18.20 (buildbot@builder1) (gcc version 4.8.3 (OpenWrt/Linaro GCC 4.8-2014.04 r46450) ) #1 Fri Sep 4 17:13:39 CEST 2015
[ 0.000000] SoC: VR9 rev 1.2
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 00019556 (MIPS 34Kc)
[ 0.000000] MIPS: machine is TDW8970 - TP-LINK TD-W8970
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 04000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x00000000-0x03ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x00000000-0x03ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x00000000-0x03ffffff]
[ 0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: console=ttyLTQ0,115200 init=/etc/preinit
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Writing ErrCtl register=00018310
[ 0.000000] Readback ErrCtl register=00018310
[ 0.000000] Memory: 60004K/65536K available (3492K kernel code, 151K rwdata, 816K rodata, 192K init, 206K bss, 5532K reserved)
[ 0.000000] NR_IRQS:256
[ 0.000000] CPU Clock: 500MHz
[ 0.000000] Calibrating delay loop... 332.54 BogoMIPS (lpj=665088)
[ 0.032000] pid_max: default: 32768 minimum: 301
[ 0.036000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.040000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.044000] pinctrl core: initialized pinctrl subsystem
[ 0.048000] NET: Registered protocol family 16
[ 0.056000] pinctrl-xway 1e100b10.pinmux: Init done
[ 0.060000] dma-xway 1e104100.dma: Init done - hw rev: 7, ports: 7, channels: 28
[ 0.164000] dcdc-xrx200 1f106a00.dcdc: Core Voltage : 1016 mV
[ 0.276000] ath9k,eeprom ath9k_eep: failed to load eeprom address
[ 0.288000] usbcore: registered new interface driver usbfs
[ 0.292000] usbcore: registered new interface driver hub
[ 0.296000] usbcore: registered new device driver usb
[ 0.300000] PCI host bridge to bus 0000:00
[ 0.304000] pci_bus 0000:00: root bus resource [mem 0x1c000000-0x1cffffff]
[ 0.308000] pci_bus 0000:00: root bus resource [io 0x1d800000-0x1d8fffff]
[ 0.312000] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.316000] ifx_pcie_rc_class_early_fixup: fixed pcie host bridge to pci-pci bridge
[ 0.328000] pci 0000:00:00.0: BAR 8: assigned [mem 0x1c000000-0x1c0fffff]
[ 0.332000] pci 0000:00:00.0: BAR 9: assigned [mem 0x1c100000-0x1c1fffff pref]
[ 0.336000] pci 0000:01:00.0: BAR 0: assigned [mem 0x1c000000-0x1c01ffff 64bit]
[ 0.340000] pci 0000:01:00.0: BAR 6: assigned [mem 0x1c100000-0x1c10ffff pref]
[ 0.344000] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 0.348000] pci 0000:00:00.0: bridge window [mem 0x1c000000-0x1c0fffff]
[ 0.352000] pci 0000:00:00.0: bridge window [mem 0x1c100000-0x1c1fffff pref]
[ 0.356000] ifx_pcie_bios_map_irq port 0 dev 0000:00:00.0 slot 0 pin 1
[ 0.360000] ifx_pcie_bios_map_irq dev 0000:00:00.0 irq 144 assigned
[ 0.364000] ifx_pcie_bios_map_irq port 0 dev 0000:01:00.0 slot 0 pin 1
[ 0.368000] ifx_pcie_bios_map_irq dev 0000:01:00.0 irq 144 assigned
[ 0.372000] Switched to clocksource MIPS
[ 0.376000] NET: Registered protocol family 2
[ 0.380000] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.388000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.396000] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.400000] TCP: reno registered
[ 0.404000] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.408000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.416000] NET: Registered protocol family 1
[ 0.420000] gptu: totally 6 16-bit timers/counters
[ 0.424000] gptu: misc_register on minor 63
[ 0.432000] gptu: succeeded to request irq 126
[ 0.436000] gptu: succeeded to request irq 127
[ 0.440000] gptu: succeeded to request irq 128
[ 0.444000] gptu: succeeded to request irq 129
[ 0.448000] gptu: succeeded to request irq 130
[ 0.452000] gptu: succeeded to request irq 131
[ 0.456000] phy-xrx200 gphy-xrx200: requesting lantiq/vr9_phy11g_a2x.bin
[ 0.464000] phy-xrx200 gphy-xrx200: booting GPHY0 firmware at 3940000
[ 0.472000] phy-xrx200 gphy-xrx200: booting GPHY1 firmware at 3940000
[ 0.580000] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.600000] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.604000] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.624000] msgmni has been set to 117
[ 0.628000] io scheduler noop registered
[ 0.632000] io scheduler deadline registered (default)
[ 0.640000] 1e100c00.serial: ttyLTQ0 at MMIO 0x1e100c00 (irq = 112, base_baud = 0) is a lantiq,asc
[ 0.648000] console [ttyLTQ0] enabled
[ 0.648000] console [ttyLTQ0] enabled
[ 0.656000] bootconsole [early0] disabled
[ 0.656000] bootconsole [early0] disabled
[ 0.668000] m25p80 spi32766.0: en25q64 (8192 Kbytes)
[ 0.672000] 5 ofpart partitions found on MTD device spi32766.0
[ 0.680000] Creating 5 MTD partitions on "spi32766.0":
[ 0.684000] 0x000000000000-0x000000020000 : "u-boot"
[ 0.688000] 0x000000020000-0x0000006c0000 : "firmware"
[ 0.696000] 0x0000001917fe-0x0000006c0000 : "rootfs"
[ 0.704000] mtd: device 2 (rootfs) set to be root filesystem
[ 0.708000] mtdsplit: no squashfs found in "rootfs"
[ 0.712000] mtdsplit: no squashfs found in "spi32766.0"
[ 1.556000] 0x0000006c0000-0x0000007c0000 : "dsl_fw"
[ 1.564000] 0x0000007c0000-0x0000007d0000 : "config"
[ 1.568000] 0x0000007d0000-0x000000800000 : "boardconfig"
[ 1.676000] libphy: lantiq,xrx200-mdio: probed
[ 1.752000] eth0: attached PHY [Lantiq XWAY PEF7071] (phy_addr=0:00, irq=-1)
[ 1.820000] eth0: attached PHY [Lantiq XWAY PEF7071] (phy_addr=0:05, irq=-1)
[ 1.888000] eth0: attached PHY [Lantiq XWAY VR9 GPHY 11G v1.4] (phy_addr=0:11, irq=-1)
[ 1.956000] eth0: attached PHY [Lantiq XWAY VR9 GPHY 11G v1.4] (phy_addr=0:13, irq=-1)
[ 1.964000] wdt 1f8803f0.watchdog: Init done
[ 1.968000] TCP: cubic registered
[ 1.968000] NET: Registered protocol family 17
[ 1.972000] bridge: automatic filtering via arp/ip/ip6tables has been deprecated. Update your scripts to load br_netfilter if you need this.
[ 1.988000] Bridge firewalling registered
[ 1.988000] 8021q: 802.1Q VLAN Support v1.8
[ 2.068000] ath9k,eeprom ath9k_eep: using led pin 0.
[ 2.072000] ath9k,eeprom ath9k_eep: loaded ath9k eeprom
[ 2.080000] UBIFS error (pid 1): ubifs_mount: cannot open "ubi0:rootfs", error -19
[ 2.108000] List of all partitions:
[ 2.108000] 1f00 128 mtdblock0 (driver?)
[ 2.112000] 1f01 6784 mtdblock1 (driver?)
[ 2.120000] 1f02 5306 mtdblock2 (driver?)
[ 2.124000] 1f03 1024 mtdblock3 (driver?)
[ 2.128000] 1f04 64 mtdblock4 (driver?)
[ 2.132000] 1f05 192 mtdblock5 (driver?)
[ 2.140000] No filesystem could mount root, tried: squashfs
[ 2.144000] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)
[ 2.144000] ---[ end Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(31,2)
[ 33.072000] random: nonblocking pool is initialized
i was thinking about flashing u-boot from Uart mode so its not the case