Code executing while ROMS1=1

[rana]

Posted on November 26, 2006 at 12:50

Code executing while ROMS1=1

[rana]

Posted on November 15, 2006 at 10:51

Hello all.

I use ST10F276. I want to call code temporary unprotection (CTU) from the I-Flash while ROMS1=1. Can I call a function which sit in the I-Flash (B0F4) when ROMS1=1? In other words: Why can't I call a function which sit in the I-Flash (B0F4) when ROMS1=1? The Debbuger (Tasking v8.5 r2) lose connection when I call (Step over) this function. Now, In this early step of the developement, this CTU function contains: void IF_UnProtect(void) { // FCR0H |= 0x0100; /* set protection operation */ // FARL = 0xDFB8; /* load FNVAPR0 */ // FARH = 0x000E; // FDR0L = 0xFFFF; /* DBGP = ACCP = 1 */ // FCR0H |= 0x8000; /* operation start */ _nop(); _nop(); } This Function sits at 0x0180066... Please help Ran

[najoua]

Posted on November 15, 2006 at 11:18

Hello Ran,

The ROMS1 bit allows remapping blocks B0F0, B0F1, B0F2, B0F3 from segment 0 to segment 1 when it is set (before EINIT). So, it has no effect and there is no problem when calling a function in the I-Flash (B0F4). Normally, the behavior you are describing should be observed even when ROMS1 = 0 as the behavior is ROMS1 bit independant. You are using Cross View Debugger to debug your application. So, I suppose that your application is executed from an external RAM. Are you sure that using Cross View debugger, you are able to call and execute a routine allocated in the Flash? This is to be verified with Tasking Technical Support. I will contact them and keep you informed accordingly. Regards, Najoua.

[rana]

Posted on November 15, 2006 at 11:42

Thank you.

I tried to set a breakpoint after this function call and run freely to that breakpoint, The CrossView lost connection... The Sub-System sequence: Compile ''Hex'' file with Func-A, which put the Func-A pointer in NVRAM. Load and Run it. (Running) Compile Debug file with Func-B, which read the pointer from NVRAM, and call that pointer. Load, put a breakpoint after Func-B and RUN. (The pointer exist with right value. Run. The Debugger lose connection) Thanks - Ran

[najoua]

Posted on November 16, 2006 at 06:27

Hello Ran,

When you use a monitor, a routine from flash cannot be debugged. However, it should be possible to run through a routine in Flash and break afterwards somewhere in RAM memory. The debug connection loss problem had been reported to Tasking Technical support. Regards, Najoua.

[rana]

Posted on November 16, 2006 at 08:18

Thanks, Najua.

Can I have Access protection just for [B0F0 -> B0F3]? This would be very helpfull... Anyone who knows may answer... Ran

[najoua]

Posted on November 16, 2006 at 09:10

Below is Tasking support answer:

---------------------------------------------------------------- When a breakpoint is set, CrossView first determines how many instructions are between the current program counter and the new breakpoint. If this amount is below a certain level, CrossView may decide to single step towards the breakpoint instead of a free run. Because single stepping through ROM is not possible, the connection will be lost. So running through a routine in flash using a monitor is not a good idea after all... ------------------------------------- Regarding the access protection just for [B0F0 -> B0F3], unfortunately, it is not psossible because Access Protection is applied to the whole IFLASH and can not applied by block. Sorry for the inconvenience, Regards, Najoua.

[rana]

Posted on November 16, 2006 at 09:47

Najua,

Thank you anyway... Ran

[rana]

Posted on November 26, 2006 at 12:50

As I understood, I've put the calling behind lots of code, but still I have TFR=8 (protection fault).

The problem is: My function contains NOPs only. No protected instructions at all... Can I send my Project to anyone for to have a look?