Design PCB Tiny6410

I'm a student & I have board Tiny6410 1111 and intend to design a clone of
it. I've already boot Android/WinCE/Ubuntu/Linux in Tiny6410.

I have some questions to understand the code of OS. My clone board has just
some components : 

S1 , S2
CN1
U5 : Replaced with LM1117S-3.3V
R11,R41 , R2 , R21 R22 , R16 R17 R79 R80 
C1 ,C2 C3 C62 C69 C70 C71 C72 
LED_3.3
RST
LCD2
P1,P2

- What is my problem ?
When I switch S2 to SD mode & insert SD card , all the off leds seems to be
in SD boot state. 
When I switch S2 to Nand mode (with any included modified OS of
FriendlyARM) , LED1 blink. I read the manual & it said that the board is in
the boot state. When I solder U1 (MAX3232CDR) to debug, in Nand MODE , LED1
off , in UART app bit CD on off continuously . I turn on bit DTR => LED1
blinky forever, no output data from COM0

My schematic is the same as Tiny6410 1111.

- My questions :
  + Can my board with components like that RUN any FriendlyARM OS ? 
  + What components will be checked when the CORE start ? I mean, because
in Nand mode LED1 blink , so I think the CORE probably wait to receive ACK
from some components that I don't know.

The OS code is so large for me to take alot of time to understand & modify.


Can someone help me ? Thanks

Hi there,

Does you board include the boot loader?

Dave...

Yes, the CORE 6410 has already been installed when it plugged in KIT
Tiny6410

Hix, no one help me ?

Hi, khaclub

see here: http://www.arm9home.net/read.php?tid-15548.html

Thank you very much. It's very good stuff

Hi khaclub

I have the problem. 

Can you send the schematic? Thanks