debug/readout protection

jgoril · ‎2008-04-16

Posted on April 17, 2008 at 06:37

jgoril · ‎2007-05-21

Posted on May 21, 2007 at 13:36

Hi. At what moment debug/readout protection becomes valid (takes effect)? Is it immediately after writing the appropriate register or some additional action is needed (e.g. device reset)? Thanks for the answer.

najoua · ‎2007-05-21

Posted on May 21, 2007 at 14:41

Hi opijozko,

Yes, the debug/readout protection becomes valid immediately after writing the appropriate register.

Regards,

Najoua.

alexandre2399 · ‎2008-04-14

Posted on April 15, 2008 at 08:33

Hello,

I looking for readout protection of my code. Im using a STR712, IDEalist and the wiggler to program it. Usually I just tick a box to readout protect the code, but for the ARM it looks like it is not that easy. Could someone tell me the easiest way to protect my code ?

Regards,

Alex

PS: The hardware is done and can't be changed.

jgoril · ‎2008-04-15

Posted on April 15, 2008 at 11:46

Hi alexandre.o

I don't know the IDEalist and it's features. However, readout protection feature is implemented for our universal device programmers (JTAG interface is used for in-situ programming). May be, you will find them useful. See my homepage for BeeProg+ 🙂

alexandre2399 · ‎2008-04-15

Posted on April 15, 2008 at 12:59

Thanks for your help opijozko.

I've been looking on your software, it is written that if I Debug/Readout protect it, I wont be able to access to my device again. But what I am looking for is to be able to program/erase only but still be able to program it from the JTAG Wriggler. Does the ARM has this possibility ?

Thanks,

Alex

jgoril · ‎2008-04-16

Posted on April 17, 2008 at 06:37

Hello alexandre.o.

After enabling debug/readout protection, JTAG port is disabled internally in device logic. It is not possible to use that interface, not regarding the tool or STR7xx device.

However, you can still assign a part of flash memory for your own IAP bootloader that communicates e.g. via UART. Then you can use a technique described in STR7 Family Flash Programming Reference Manual for treating the debug/readout protection enabling/disabling.

I'm afraid, it is the only way to solve your problem using STR71x device.

For STR73x - the situation is similar. But I didn't test the system memory boot mode for this device. May be, there is some way how to erase flash and disable the protection.

For STR75x there is a built-in bootloader for system memory boot mode. This bootloader enables you to erase flash and disable the protection, it communicates also via UART.

Regards

Jozef