Pointer allocation problem

[Richard Earnshaw]

On Fri, 2006-09-01 at 05:08, Kanwal Preet Singh CHANANA wrote:
> Hi all,
> 
> I am porting my project from ADS to GCC_ARM v4.0.3. I have been able to
> compile & Link my source files with GCC-ARM.  The image (running in Flash)
> crashes on target. The reason for crash is wrong pointer allocation.
> 
> I have used a pointer to a structure as shown below:
> 
> typedef volatile struct UARTInfoTag
> {
>     void                         (*rxInt_p) (void);
>     void                         (*txComplete_p) (void);
>     tUartLineStatusCallbackFunc  lineStatusInt_p;
>     tBool                        NewRxData;
>     tBool                        IsTransmitting;
> } UARTInfo;
> 
> #define NUMBER_OF_UARTS		2	
> 
> UARTInfo   UARTCallBack[NUMBER_OF_UARTS];
> UARTInfo  *pUARTInfo = &UARTCallBack[0];
> 
> UARTCallBack is located in RAM with &UARTCallBack[0]=0x000033C8, but
> pUARTInfo contains the value 0x4B1D1BCA & pUARTInfo is located in RAM at
> address 0x00001FCA.
> 
           ^^^^^^^^^^^

here's your problem.  This isn't a 32-bit aligned address, so attempts
to deference it as an aligned address will fail.

Are you sure your scatter file is correctly aligning your rw and zi
sections correctly?

R.


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