How to make System_printf work

Wending,

Are you trying to channel output from System_printf from the DSP on the ARM running Linux?  One way of doing this is to create a section on the DSP that will be placed in shared memory (i.e. DDR on OMAP3) and place all output from System_printf in this section.   The Linux host can then read and output the text in this shared memory.

You will need to use the 'SysMin' system proxy on the DSP by adding the following code to your .cfg file:

/* Create a section called '.sysminsection' that will reside in shared memory  */

Program.sectMap['.sysminsection'] = new Program.SectionSpec();

Program.sectMap['.sysminsection'].loadSegment = "DDR"; /* Replace 'DDR' with the correct name of the shared memory segment in the OMAP3 platform */

/* Use the SysMin support proxy */

var System = xdc.useModule('xdc.runtime.System');

var SysMin = xdc.useModule('xdc.runtime.SysMin');

SysMin.sectionName = '.sysminsection';

System.SupportProxy = SysMin;

Now, once your application is built, you will have to obtain the actual address of the SysMin buffer from your application's .map file.  You may find something like this in your .map file:

.bss       0    80004000    00009214     UNINITIALIZED

                  80004000    00008000     myapp_x64P.o64P (.bss:xdc_runtime_SysMin_Module_State_0_outbuf__A)