[En-Nut-Discussion] AT91SAM7X-EK debugging

[Jix Electronics]

Thanks,

Nut/OS starts now with debugging.

BTW. there is wrong register address for watchdog mode register (WDT_WDMR) in
at91_wdt.h file, it should be
#define WDT_WDMR        (WDT_BASE + 0x04) /* Watchdog Mode Register. */

Jix

> Hi,
>
> Sam7xLowLovelInit being (naked) is running into the data pool placed by
> the
> c compiler right after it. I already told Harald about it. That literature
> data represent instructions that trigger exception. I solved by placing a
> asm volatile ("b __ContSam7xLowLevelInit"); before the end of function.
>
> __ContSam7xLowLevelInit must be defined in crtat91sam7x256_rom.s
>
> /*
>  * Section 2: Set stack pointers.
>  */
>         .section .init2,"ax",%progbits
>         .global __ContSam7xLowLevelInit
> __ContSam7xLowLevelInit:
>         /*
>          * Set exception stack pointers and enable interrupts.
>          */
>         ldr     r0, =__exp_stack
>         msr     CPSR_c, #ARM_MODE_FIQ | 0xC0
>         mov     r13, r0
>         sub     r0, r0, #FIQ_STACK_SIZE
>
> This is little ugly, so maybe a cleaner solution must be found. There are
> also at least 2 bugs in at91sam7x_emac. A new release probably  will
> follow.
>
>
>
>
>
> ----- Original Message -----
> From: "Jix Electronics" <jix.electronics at mbnet.fi>
> To: <en-nut-discussion at egnite.de>
> Sent: Sunday, July 16, 2006 10:26 AM
> Subject: [En-Nut-Discussion] AT91SAM7X-EK debugging
>
>
>> Hi,
>>
>> I have problem to start Nut/OS debugging with AT91SAM7X-EK using
>> Eclipse/OpenOCD/Wiggler(olimex).
>>
>> First flashed Nut/OS events sample program to the MCU with SAM-BA.
>> Program
>> starts ok and UART prints comes to terminal. But when starting to debug
>> with
>> jtag it hangs on very early state, somewhere in Sam7xLowLovelInit
>> function.
>>
>> Has anyone get debugging to work, any ideas what is wrong with my setup?
>>
>> Are there other tools which work properly?
>>
>> Regards,
>> Jix
>>
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>>
>
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