I use the DM3730 Torpedo SOM on my board(that is same as telhe Devopment Kit baseboard). I put the demo ML0 u-boot.bin Image and rootfs.ext2.gz that from logicpd wed into SD card. Then set boot[0] and boot[5] to 1. Inset the SD, powe on .That should be boot from MMC1, but the console (set 115200 8  1 none )conneted uart1  display anything. Push the rstn button and release,  it displayed nothing yet. But when I test the vmmc1, SD_clk, sd_cmd, sd_d0, sd_d3. these signals are correct. Also the signal v_1.8,v_1.2...in DM3730 Torpedo SOM are fine. When  I test the UARTA_TX from J1 pin72, the level is 1.8v, but when I push the RSTN button and release, the level change to low at begin, then keep low several seconds before charge to 1.8v. But as I know it should be a low pulse in normal. 

Also I tried to set the boot[0] and boot[5] to 0, and not inset SD card.  It should be boot from NAND FLASH at the  DM3730 Torpedo SOM. But  I  also got nothing from the uarta. 

So what's the problem that could let the DM3730 Torpedo SOM cann't boot? And is it anything in the DM3730 Torpedo SOM Nand Flash? Or should I modify the x-loader or something else?

Thanks!!!