Re: [Openocd-development] How to disable MMU in OpenOCD?

[dswei <ds...@si...>]

Thank you, vind_Harboe.
I don't exactly know what is "srst_pulls_trst" 's mean, but I can disable MMU now, that is enough for my urgent task now.
I run the openocd command "arm920t cp15 2 0",  "step", "poll", then the MMU is diabled.
But now I have another question:
1. The "help cp15" is:
arm920t cp15i        display/modify cp15 (interpreted access) <opcode> 
                          [value] [address]
arm920t cp15        display/modify cp15 register <num> [value]

2. the format of  ARM instruction mcr and mrc are:

MCR/MRC{cond} P15,opcode_1,Rd,CRn,CRm,opcode_2

31    28  27 26 25 24   23      21 20  19     16 15    12  11 10 9 8    7        5   4   3        0
| Cond | 1   1   1   0 | opcode1 | L |    CRn  |    Rd    | 1  1  1  1 | opcode2 | 1 |   CRm  |

What is the relation beteen "arm920t cp15" and ARM instruction mcr and mrc?
I try "arm920t cp15 0", "arm920t cp15 1", "arm920t cp15 2", and so on, to read the cp15; and then know that "arm920t cp15 2" is for MMU.
Are there some exact relations between "MCR/MRC{cond} P15,opcode_1,Rd,CRn,CRm,opcode_2" and "arm920t cp15", ""arm920t cp15i"?


	


>Did you check if srst pulls trst for this part?
>
>That would explain why reset halt doesn't work.
>
>Adding "srst_pulls_trst" will remove the error message from "reset halt",
>but it won't reset the board into the halted state.
>
>
>
>
>
>-- 
>vind Harboe
>http://www.zylin.com/zy1000.html
>ARM7 ARM9 XScale Cortex
>JTAG debugger and flash programmer

= = = = = = = = = = = = = = = = = = = =
			

　　　　　　　　致
礼！
 
				 
　　　　　　　　dswei
　　　　　　　　ds...@si...
　　　　　　　　　　2008-09-05