Hi, we design the AM335X board refer to beagleboneblk and we set sysboot [15:0]= 0100000000111100.   and we measured all power supply of TPS652
17c and AM335X are Ok

according to //processors.wiki.ti.com/index.php/Sitara_Linux_AM335x_Flash_Programming_Linux_Development
we understand we can use UniFlash to download images to target AM335x board. after we config all parameter, we see the log from opendhcp that: 

BOOTPREQUEST for d0:5f:b8:fb:e8:b3 () from interface 192.168.2.1 received,

BOOTP Host d0:5f:b8:fb:e8:b3 (Hostd05fb8fbe8b3) allotted 192.168.2.3

so, can i confirm that BOOTREQUEST is sent by target baord, i.e client?

does this prove that target AM335X board has IP address 192.168.2.3 and Mac address d0:5f:b8:fb:e8:b3 ?  

and can i confirm BOOTP, RNDIS work fine between PC and AM335x board?  

we see the log from Opentftp below,

[07-Jul-15 15:14:43] Open TFTP Server MultiThreaded Version 1.64 Windows Built 2001 Starting..
[07-Jul-15 15:14:43] starting TFTP service
[07-Jul-15 15:14:43] alias / is mapped to C:\AM335x_Flashtool\images\
[07-Jul-15 15:14:43] permitted clients: all
[07-Jul-15 15:14:43] server port range: all
[07-Jul-15 15:14:43] max blksize: 65464
[07-Jul-15 15:14:43] default blksize: 512
[07-Jul-15 15:14:43] default timeout: 3
[07-Jul-15 15:14:43] file read allowed: Yes
[07-Jul-15 15:14:43] file create allowed: No
[07-Jul-15 15:14:43] file overwrite allowed: No
[07-Jul-15 15:14:43] thread pool size: 1
[07-Jul-15 15:14:43] Listening On: 192.168.2.1:69
[07-Jul-15 15:14:48] Client 192.168.2.3:1234 C:\AM335x_Flashtool\images\u-boot-spl-restore.bin, 208 Blocks Served

does this information prove tftp works fine due to spl blocks served? 

in case bootp and tftp are all ok, why uart0 can not print any of information?  even if CCCCC?  is there some checklist for finding issue of booting?

 many thanks.