LS1021A RCW override problem

[hwei]

Hi there,

Recently I tried to use CodeWarrior to override RCW on our customized board and got some trouble.

We are using a Rev2 LS1021A, and there is only NAND flashes for booting up, the hardware has been verified.

While I follow the instructions to connect to the processor, it fails every time.  This board is configured to load RCW from NAND but due to nothing on the NAND flash, the processor will keep resetting. The CW fails to connect to the processor, I don't know if  it's possible to do it in such a condition.

The CodeWarrior 10.0.7 is configured to connect to OCRAM, the JTAG configuration file is modified from LS1021AQDS, and I always get the result :

Error message: Cable disconnected (target power not detected)

Any advice on this is appreciated.

Thanks

[addiyi]

This error says that the prob tip cable is not connected between CWTAP and board.

Adrian

[hwei]

addiyi,

Thanks for your reply.

My problem is my board keep resetting due to fail to read RCW from NAND Flash, which is blank, and there is no enough time for the CW to connect to the board to make the RCW override happen. But without the RCW override, the processor will keep resetting.

There are posts on successful RCW override on SPI flash and other boot devices, but is there some way to make it on NAND flash? Or is it possible to do that?

Thanks

[addiyi]

You should use RCW override from CW. Please take a look at Chapter 8.2 Using a JTAG configuration file to override RCW, from \Freescale\CW4NET_v2017.03\CW_ARMv7\ARMv7\Help\PDF\

Adrian

[jiye]

Hi Adrian,

where can I find this folder

 \Freescale\CW4NET_v2017.03\CW_ARMv7\ARMv7\Help\PDF\

Thanks

[hwei]

addiyi‌

Thanks for your reply.

I have followed the instructions in "Chapter 8 JTAG Configuration Files" and it didn't work.

As the LS1021A reference manual chapter 4.4.1 indicates the processor will keep resetting while it fail to load RCW from IFC NAND. 

The processor keeps resetting while booting up and I didn't seen the CW successfully connect to the processor in the console log.

I don't know how the RCW override works. Does it require the CW & TAP to connect to the processor to get everything setup?

Thanks

[addiyi]

Could you provide a ccs verbose log (issue 'log v' command in ccs console) while CW is trying to connect to the board using RCW override?

Adrian

[hwei]

addiyi‌

Below is ccs console log:

CCSAPI connection #1 accepted from localhost at Wed Jul 19 14:04:35 2017
check_min_version(serverh=0,*version)
api version: 00000004 00000006
get_connection_count(serverh=0,cc_index=0,*count)
count:1
available_connections(serverh=0,*count,*cc)
connections: {0,73,0xa9fe1a53}
available_connections(serverh=0,*count,*cc)
connections: {0,73,0xa9fe1a53}
available_connections(serverh=0,*count,*cc)
connections: {0,73,0xa9fe1a53}
available_connections(serverh=0,*count,*cc)
connections: {0,73,0xa9fe1a53}
available_connections(serverh=0,*count,*cc)
connections: {0,73,0xa9fe1a53}
available_connections(serverh=0,*count,*cc)
connections: {0,73,0xa9fe1a53}
cc_version(serverh=0,cc_index=0,index=0,*version)
get_config_chain(serverh=0,cc=0)
config_server(config_reg=0,config_data=0x00002710)
config_chain(serverh=0,cc=0,count=3,*devlist,*generic)
devlist: ls1020a,dap,sap2
ERROR(4): Cable disconnected (target power not detected)
CCSAPI connection #1 from localhost closed at Wed Jul 19 14:04:36 2017

The RUN/PAUSE led on the CWTAP keeps changing from RED to OFF as the processor resetting. 

Thanks

[addiyi]

Check the connection between the board and CWTAP, since the error message is Cable disconnected (target power not detected). Also, check the power on jtag connected from the board.

Adrian

[hwei]

addiyi‌

There is no problem with the CW TAP, it has been verified and used in other projects. The "RUN/PAUSE" led will be red if it connects to the processor.

It just cannot successfully make the RCW override on the board which boots from a blank NAND flash.

As I said, the LS1021A processor keeps resetting, due to the blank NAND, so the CW TAP will lose the connection continuously.

Is it possible to make the RCW override in this condition?

Does it need to keep the CW TAP connection to the processor?

Thanks

[addiyi]

Yes, this is the scope of RCW override, to get out the processor from reset. But until you resolve the error from ccs, Cable disconnected, CWTAP will not be able to connect to the processor.

Adrian