Codewarrior Tap connect MPC8280 Issue.

[dongcarlles]

I am new to freescale mcus. Now I am working on a MPC8280 Board using Codewarrior Tap. I met a issue when I connect MPC8280 using codewarrior tap. I describe it as following.

I pull up nRSTCOF to use internal configuration word which is zero. And I Successfully connect Codewarrior Tap to 8280. I can access CPU register like MSR. But I can not get access to memory map register like BR1,OR1.  I don't know why? any one can help?

Plus I am using CW 8.8

[lhb_will]

请问你解决这个问题了吗？

[lunminliang]

Hello Dong Carlles,

Are you trying to view from the debugger register window, or view from memory window, or access from software code?

Regards

Lunmin

[dongcarlles]

Yes, I am trying to access  the configuration registers when I view the debugger register. But it fails. I can only access the G2_LE core registers like MSR. But I can not access the configuration register like BR0 BR1..etc.

[lunminliang]

Hello Dong Carlles,

Sorry for late, can you please take a photo shot of the failure?

Regards

Lunmin

[dongcarlles]

Hi，lunminliang，

     Thank you for response.

1.      Figure one show that I can connect to the MPC8280 as following.

2, Figure w show that I can get access to the 8280 core.

3. Figure three show that I can not access other registers. It is all zeros. And I cannot modify it.

]

Hope you can give some instruction on this. Thank you.

[lunminliang]

Hello Dong Carlles,

Do you have a proper .cfg file for the connection?

Regards

Lunmin

[dongcarlles]

I write a .cfg file but I seems have no affection to this. No matter how I modify it. It just perform the same.

Here is the configure file content.

writereg MBAR 0x0f000000

writemmr IMMR 0x01000000

writereg MBAR 0x01000000

#Main System Clock Configuration Registers

writemmr SYPCR 0xFFFFFF81 # SYPCR: turn off watchdog timer

writemmr SCCR 0x00000001 #  Force baud rate clock divisor = 16

writemmr RMR 0x0001   # generate reset when core enters checkstop state.

# Setup the chip selects

# CS0 - 32MB flash

writemmr BR0 0xFE001001

writemmr OR0 0xFE000876

# CS1 - 8MByte(2*16bits + 2*16bits) SRAM

writemmr BR1 0x10001801

writemmr OR1 0xFF800876

writemmr MPTPR 0x2000 # MPTPR: Set the Memory Periodic Timer Prescaler

writemmr PSRT 0x1F # set 60x Bus assigned SDRAM Refresh Timer (PSRT) ~ 15.6us

writemmr SIUMCR 0x05340C00 # Set SIU configuration bits

writemmr TESCR1 0x00004000  # 60x bus data errors disabled

writemmr L_TESCR1 0x00004000

writereg MSR 0x3002   # Machine Mode Register

From my view, after I write MBAR, then I can write and read at least IMMR. And I try to just write MBAR and IMMR. I still can not access the IMMR. It still stay on zero.

[dongcarlles]

Plus: MPC8280 will also reset after about 20~30 seconds.