why dram data pin not regular on A13-OLINUXINO board

[kamikazi]

hi
in schematic that is for A13-OLinuXino and in tracks that is for u2 component (H5TQ2G83CFR-H9C) why nets that is for data (D8.....D15) is not respectively connected to DQ0 .... DQ7
connection nets in dram u2 is :
DQ0 ———-> D15
DQ1 ———-> D12
DQ2 ———-> D13
DQ3 ———-> D8
DQ4 ———-> D11
DQ5 ———-> D10
DQ6 ———-> D9
DQ7 ———-> D14
shell it be like this ??
DQ0 ———-> D8
DQ1 ———-> D9
DQ2 ———-> D10
DQ3 ———-> D11
DQ4 ———-> D12
DQ5 ———-> D13
DQ6 ———-> D14
DQ7 ———-> D15
in ddr3 sdram u1 data pin connection is correct but in ddr3 sdram u2 confuse and data pin is unregular please help me
The operating system is defined as؟؟؟
I am confused please help me

[davidefa]

There's nothing wrong with that: data are written in 'mixed order' ( from our point of view ) and then read back using the same 'mixed order', so everything goes to the right place

[kamikazi]

very tanks davidefa for your answer
so in A13-OLinuXino-MICRO board data pins of dram is regular (D0....D15 connected to DQ0....DQ15) because only one dram used and defined by in os (mixed order)
so why in A13-OLinuXino-MICRO board This method is not used

[kamikazi]

Hi all friends
I've designed a board based on the schematic A13-OLinuXino
After assembling the board all things was good (Output of voltage regulators and connection parts )
i download This image (A13_debian_34_75_WIFI_GCC_GPIO_X_I2C_100KHz_UVC_TS_video_release_8.img) and write it on the sd card and connect usb2serial cable to usart1 and power up the board after power up not Happened anythings and I have seen on hyperterm :

U-Boot SPL 2012.10-04259-g832a8e5 (Nov 08 2012 - 06:49:37)
DRAM: ? ? 0MB
### ERROR ### Please RESET the board ###

somehow a13 Did not see dram
on my dram write skhynix that Difference with hynix that used on A13-OLinuXino board but part number Both dram is H5TQ2G83CFR-H9C 
This problem could be the sd card Quality or the dram type or Impedance matching for dram data bus Routing
Who knows where it could be problem?

[kamikazi]

anyone can not help me