Other Parts Discussed in Thread: OMAP-L138
Hello,
I've got my audio sample soc example running and I was wondering some question that DSP expert could probably answer easily:
On L138 there is a 128KB shared RAM between DSP and ARM mapped @0x80000000.
DSPLInk does not use it, it use DDR2 instead so data exange are done via EMIFA.
Shouldn't be more efficient to use the shared RAM instead? (assuming we only need 128K to communicate)
Where can I find n Shared ram access time?
Is it possible to define in DSPlink, one pool based on shared ram and one pool based on DDR?
Below is what I found on my current config:
/** ============================================================================
* @name RESETCTRLADDR
*
* @desc Indicates the start address of Reset Ctrl memory region.
* last two nibbles must be zero i.e. align to 256 boundary.
* ============================================================================
*/
#define RSTENTRYID 0
#define RESETCTRLADDR 0xC3E00000
#define RESETCTRLSIZE 0x80
/** ============================================================================
* @name CODEMEMORYADDR/CODEMEMORYSIZE
*
* @desc Indicates startaddress/size for dsplink code region.
* ============================================================================
*/
#define CODEENTRYID 1
#define CODEMEMORYADDR (RESETCTRLADDR + RESETCTRLSIZE)
#define CODEMEMORYSIZE 0xFFF80u
/** ============================================================================
* @name SHAREDENTRYID/SHAREDMEMORYADDR/SHAREDMEMORYSIZE
*
* @desc Indicates startaddress/size for dsplink shared memory region.
* ============================================================================
*/
#define SHAREDENTRYID0 2
#define SHAREDMEMORYADDR0 (CODEMEMORYADDR + CODEMEMORYSIZE)
#define SHAREDMEMORYSIZE0 0x5000
/** ============================================================================
* @name SHAREDENTRYID/SHAREDMEMORYADDR/SHAREDMEMORYSIZE
*
* @desc Indicates startaddress/size for dsplink shared memory region.
* ============================================================================
*/
#define SHAREDENTRYID1 3
#define SHAREDMEMORYADDR1 (SHAREDMEMORYADDR0 + SHAREDMEMORYSIZE0)
#define SHAREDMEMORYSIZE1 0x2B000
/** ============================================================================
* @name POOLMEMORYADDR/POOLMEMORYSIZE
*
* @desc Indicates startaddress/size for dsplink POOL memory region.
* ============================================================================
*/
#define POOLENTRYID 4
#define POOLMEMORYADDR (SHAREDMEMORYADDR1 + SHAREDMEMORYSIZE1)
#define POOLMEMORYSIZE 0x000D0000u
Regards,
Pep
