C5535 "printf" problem with "small memory model"

Does your program contain any hand-coded assembly code?

If not, I would expect that if printf works in large memory model, that switching to small memory model should work.

If your executable is small, could you post it here?

Hello,

There is no assembly code on my Project...
I take the project aic3204 from the test code of EZDSP board here: http://support.spectrumdigital.com/boards/ezdsp5535/revc/

In large memory model everything is ok the project work.
But in small memory model "printf" never return.

I have CCS V5.3.0090,

Regards,

Max
 

I found that the problem seem to be in the linking file.

For example i create a new project with "Hello world" for C5535 DSP.

Here is the linking file which work:

/* SPECIFY THE SYSTEM MEMORY MAP */

MEMORY
{
MMR (RWIX): origin = 0x000000, length = 0x0000c0 /* MMRs */
DARAM0 (RWIX): origin = 0x0000c0, length = 0x00ff40 /* 64KB - MMRs */
SARAM0 (RWIX): origin = 0x010000, length = 0x010000 /* 64KB */
SARAM1 (RWIX): origin = 0x020000, length = 0x020000 /* 128KB */
SARAM2 (RWIX): origin = 0x040000, length = 0x00FE00 /* 64KB */
VECS (RWIX): origin = 0x04FE00, length = 0x000200 /* 512B */
PDROM (RIX) : origin = 0xff8000, length = 0x008000 /* 32KB */
}

/* SPECIFY THE SECTIONS ALLOCATION INTO MEMORY */
SECTIONS
{
.text >> SARAM0|SARAM1|SARAM2 /* Code */

/* Both stacks must be on same physical memory page */
.stack > DARAM0 /* Primary system stack */
.sysstack > DARAM0 /* Secondary system stack */

.data > DARAM0 /* Initialized vars */
.bss > DARAM0 /* Global & static vars */
.const > DARAM0 /* Constant data */
.sysmem > DARAM0 /* Dynamic memory (malloc) */
.switch > DARAM0 /* Switch statement tables */
.cinit > DARAM0 /* Auto-initialization tables */
.pinit > DARAM0 /* Initialization fn tables */
.cio > DARAM0 /* C I/O buffers */
.args > DARAM0 /* Arguments to main() */

vectors > VECS /* Interrupt vectors */
}

Now if i only change ".bss > DARAM0" to ".bss      >>  DARAM0|SARAM0"
"printf" never returns with small memory model.

So in my current other project i tested to put bss in a single space of memory and now
I have a message on the debug output:

"Invalid CIO command (106) in the CIO buffer at address (0x4be8) was not recognized. Please check the device and program memory maps."

Do you have any idea about the problem?
I think there is issues with size of pointer in small memory model and access in memory:

pointers (data):
small memory mode:16 bits
large memory mode: 23 bits
pointers (function) 24 bits

Do you have any idea on how to configure linker file in order it works?

[EDIT] I modified my linker file to be unified memory (Only one SARAM and only one DARAM):

PAGE 0: /* ---- Unified Program/Data Address Space ---- */

MMR (RWIX): origin = 0x000000, length = 0x0000c0 /* MMRs */
DARAM0 (RWIX): origin = 0x0000c0, length = 0x00ff40 /* 64KB - MMRs */
SARAM0 (RWIX): origin = 0x010000, length = 0x03fe00 /* 64KB */
VECS (RWIX): origin = 0x04FE00, length = 0x000200 /* 512B */
PDROM (RIX) : origin = 0xff8000, length = 0x008000 /* 32KB */

PAGE 2: /* -------- 64K-word I/O Address Space -------- */

IOPORT (RWI) : origin = 0x000000, length = 0x020000

And i put all section in SARAM0, now my "printf" works but the program stop when return from a function
I think that all the memory is not directly accessible with "small memory model"
But why i havn't got any warning from the linker? 

Regards,

Max

Posted a question to the compiler team on this topic:

http://e2e.ti.com/support/development_tools/compiler/f/343/t/231950.aspx

Regards,
Mark