2008-08-27 09:48:12 Can we access Scratchpad Memory from Application?

karthik krishnamoorthy (INDIA)

Message: 61177

I know the scratchpad Memory value to be 0xFFB00000 , Now In my Application I assign this value to a pointer and I am writing some value to this Address Location , but it is crashing while writing to this location.

unsigned char *pu8address = (unsigned char *)0xFFB00000;

*pu8address = 1;

This is how I am using the Scratchpad memory.

Am I doing anything wrong in it? Also I want to know whether L1 memory can be accessed from application if so how?

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2008-08-27 16:13:20 Re: Can we access Scratchpad Memory from Application?

Mike Frysinger (UNITED STATES)

Message: 61191

currently, that is the only way. however, you should leave the lowest few bytes of scratchpad alone (say 16bytes).

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2008-08-29 02:57:04 Re: Can we access Scratchpad Memory from Application?

karthik krishnamoorthy (INDIA)

Message: 61310

Hi ,

Before crashing it is printing the message application stack size overflow please increase the stack size of application .

Am I corrupting the Application stack size , I am very sure of scratchpad memory address , so I am not writing into a wrong memory area. or is there anything like increasing stack size that I could do? Is scratchpad related to Application stack size?

regards,

Karthik.

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2008-08-29 03:21:02 Re: Can we access Scratchpad Memory from Application?

Mike Frysinger (UNITED STATES)

Message: 61312

you wouldnt get a message about stack overflowing if you werent overflowing the stack

by default, application stacks get allocated in external memory, not anywhere in L1

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2008-08-30 02:43:19 Re: Can we access Scratchpad Memory from Application?

karthik krishnamoorthy (INDIA)

Message: 61397

I am compling my application with mstack_check_l1 option which is using some portion of scratchpad memory(I believe the first few bytes or first KB ), that is why it is crashing I have written my values in the second KB onwards, now it is not crashing.

Thanks for the help,

Regards,

Karthik.

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2008-08-30 23:54:23 Re: Can we access Scratchpad Memory from Application?

Mike Frysinger (UNITED STATES)

Message: 61436

which is what i told you to do originally isnt it ?