Hello, i am using custom board based on AM1705.
If boot from UART - everything works. Writing/reading NAND from a u-boot whithout error. According to the documentation NAND connected to CS3. Pins set to boot from NAND and startup correctly read (controlled availability of an appeal to the NAND for CS3). Oscilloscope controlling the clock signal to the SDRAM.
And now, in order:
A) Preparation of u-boot file with the utility AisGen.
2) Uploading to UART working image u-boot. Next on the tftp downloading the image to nand and record it.
# tftp 0xc0700000 u-boot-nand.bin
# nand erase
# nand write 0xc0700000 0x20000 0x40000
What nand writed - checked.
3) Shut off the power
4) Install a jumper to boot from nand
5) include meals
6) The activity in the CS3 is (according to documentation should be read by a block), there is no clock signal to the SDRAM, silent in UART.