We do a cpu board for AT91SAM9X25 board refer to the atmel board, all is the same except the nand flash, we only change the Nand flash from Micro to Samsung K9F2G08UOA, it is same 256MB, and i check the datasheet, all the nand command is the same.

we can burn the bootloader to flash by sam-ba and success, But when we boot it, it can't find the nand Flash by uboot, it show as follow info:


it show the Nand FLash ID （0x70）， but the right Flash ID is 0xDA in the flash datsheet.

someone can help me.

Maybe you need the NAND jumper on?

I'd probably make sure the dataflash was erased, and inject some code in via JTAG/IDE and probe the NAND independently. Confirm you have the timings correct, and the code in AT91BootStrap correctly initializes the buses and can identify the part. If that works, go look at the uBoot source and add whatever diagnostic code you need to constrain the problem.

The problem have solved, the problem is the atmel souce code, it will read the one-wire eeprom and judge the board sn when booting, we don't set the sn in the eeprom, so they can't confirm our board, and it will affect the Nand flash probe. we remove the judge command in the code, and all is ok.

We have add our product CM-SAM9X25 in the at91.com, it will be cheaper board for atmel,
only 69USD for cpu board
only 79USD for development kit(Contain CPU board and mother board).

if you are intrested, you can see the follow website:
http://www.at91.com/component/resource/article/Tools/35-Kits%20&%20Modules/1263-cm-sam9x25-cpu-board.html



More details for the board:
http://at91sam.org/at91sam/CM-SAM9X25.html