Dear all,
    
Have troubles with Kinetis kwikstik when use redboot RAM startup .
    
I am a freshman to eCos,below is the steps about my troubles:

1. use the last CVS-eCos build the redboot from the template with no changes,and get the redboot.elf;
2. use arm-eabi-objcopy to get the redboot.bin;
3. use the J-link commander to download the redboot.bin in kwikstik' flash from address 0x00;
4. reset kwikstik,the redboot can startup successful.
 
now I want to try the RAM startup for redboot
1. same as above's step 1, I only change the template's start-up option from ROM startup to SRAM startup,get the redboot.elf;
2. use arm-eabi-objcopy to get the redboot.bin;
3. use minicom,after the kwikstik start successful from flash, and give the "RedBoot >" as below:
    
    RedBoot(tm) bootstrap and debug environment [ROM]                              
    Non-certified release, version UNKNOWN - built 10:12:01, Jun 14 2012           
                                                                               
    Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009       
    Free Software Foundation, Inc.                                                 
    RedBoot is free software, covered by the eCos license, derived from the        
    GNU General Public License. You are welcome to change it and/or distribute     
    copies of it under certain conditions. Under the license terms, RedBoot's      
    source code and full license terms must have been made available to you.       
    Redboot comes with ABSOLUTELY NO WARRANTY.
    
    Platform: Freescale KwikStik (Cortex-M4)                                       
    RAM: 0x1fff8000-0x20007000 [0x1fffb6a8-0x20007000 available]                   
    RedBoot> 

4. in the minicom console, input command RedBoot > load -v -m ymodem,and then send the file redboot.bin from setp 2,
  the trouble becomming , it can't send the redboot.bin correctly, 

the minicom send file's diaglog is below

+-----------[ymodem upload - Press CTRL-C to quit]------------+       
|Sending: redboot.bin                                         |       
|Ymodem sectors/kbytes sent:   0/ 0kRetry 0: NAK on sector    |       
|Ymodem sectors/kbytes sent:   2/ 0kRetry 0: Cancelled        |       
|                                                                       |       
|Transfer incomplete                                                 |       
|                                                             |     
| READY: press any key to continue...                         |
+-------------------------------------------------------------+   

after press any key,the console gives below:

RedBoot> load -v -m ymodem                                                     
CUnrecognized image type: 0x20008000                                           
xyzModem - CRC mode, 3(SOH)/0(STX)/0(CAN) packets, 3 retries                   
RedBoot> 

That's all, can anybody please help me? Are there any steps I did above were wrong? Thanks
Or could anyone give me the right steps to startup redboot from RAM?