Robert,
The actual memory on your board will be much more. We only put in
information for the memory needed by DSPLink. So your DDR memory segment
size can actually be increased to accommodate the extra size.
For example:
Assume that you have 256 MB on your board. You want to split this as:
ARM: 64MB (4000000),
DSP: 192MB (C000000)
Now, you do the following:
1. Specify mem=64M on your Linux bootargs. This means you are saying
that Linux (ARM) will use only the first 64MB. The last 196MB will be
used by DSP & shared memory.
2. The last address is 0x8FFFFFFF. So if the last 192MB is for DSP, you
need to start DSP & shared memory space at: (0x90000000 - C000000 =
84000000).
So your configuration will be:
{
0, /* ENTRY : Entry number */
"DSPLINKMEM", /* NAME : Name of the memory
region */
0x84000000, /* ADDRPHYS : Physical address */
0x84000000, /* ADDRDSPVIRT : DSP virtual address
*/
(Uint32) -1, /* ADDRGPPVIRT : GPP virtual address
(if known) */
0x5000, /* SIZE : Size of the memory
region */
TRUE /* SHARED : Shared access memory?
*/
},
{
1, /* ENTRY : Entry number */
"DSPLINKMEM1", /* NAME : Name of the memory
region */
0x84005000, /* ADDRPHYS : Physical address */
0x84005000, /* ADDRDSPVIRT : DSP virtual address
*/
(Uint32) -1, /* ADDRGPPVIRT : GPP virtual address
(if known) */
0xFB000, /* SIZE : Size of the memory
region */
TRUE /* SHARED : Shared access memory?
*/
},
{
2, /* ENTRY : Entry number */
"RESETCTRL", /* NAME : Name of the memory
region */
0x84100000, /* ADDRPHYS : Physical address */
0x84100000, /* ADDRDSPVIRT : DSP virtual address
*/
(Uint32) -1, /* ADDRGPPVIRT : GPP virtual address
(if known) */
0x00000080, /* SIZE : Size of the memory
region */
FALSE /* SHARED : Shared access memory?
*/
},
{
3, /* ENTRY : Entry number */
"DDR", /* NAME : Name of the memory
region */
0x84100080, /* ADDRPHYS : Physical address */
0x84100080, /* ADDRDSPVIRT : DSP virtual address
*/
(Uint32) -1, /* ADDRGPPVIRT : GPP virtual address
(if known) */
0xBEFFF80, /* SIZE : Size of the memory
region */
FALSE /* SHARED : Shared access memory?
*/
},
So you have reserved almost 191MB for DSP-side and 1MB for (DSPLINKMEM &
DSPLINKMEM1) shared memory.
3. Correspondingly, DSP-side TCF file would have:
/*
========================================================================
====
* MEM : DSPLINKMEM
*
========================================================================
====
*/
var DSPLINKMEM = prog.module("MEM").create("DSPLINKMEM");
DSPLINKMEM.base = 0x84000000;
DSPLINKMEM.len = 0x100000;
DSPLINKMEM.createHeap = false;
DSPLINKMEM.comment = "DSPLINKMEM";
/*
========================================================================
====
* MEM : RESET_VECTOR
*
========================================================================
====
*/
var RESET_VECTOR = prog.module("MEM").create("RESET_VECTOR");
RESET_VECTOR.base = 0x84100000;
RESET_VECTOR.len = 0x00000080;
RESET_VECTOR.space = "code/data";
RESET_VECTOR.createHeap = false;
RESET_VECTOR.comment = "RESET_VECTOR";
/*
========================================================================
====
* MEM : DDR
*
========================================================================
====
*/
var DDR = prog.module("MEM").create("DDR");
DDR.base = 0x84100080;
DDR.len = 0x0BEFFF80;
DDR.space = "code/data";
DDR.createHeap = true;
DDR.heapSize = 0x10000;
DDR.comment = "DDR";
4. You can even split up DDR into two or more memory segments on
DSP-side if it makes more sense.
5. You can now increase your heap size to whatever you need (keep in
mind DSP/BIOS restrictions on heap size, if any).
6. Ensure that you also change the MAR settings for DSP cache to match
the new DSP memory map.
prog.module("GBL").C64PLUSMAR128to159 = 0x00008000 ;
For this, refer to SPRU871.pdf for MAR address ranges and DSP/BIOS
documentation for syntax for the settings.
Regards,
Mugdha
-----Original Message-----
From:
[EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]
.com] On Behalf Of Robert W. Kuhn
Sent: Friday, February 15, 2008 12:34 PM
To: davinci-linux-open-source@linux.davincidsp.com
Subject: Re: DSP-Heap
Am Thu, 14 Feb 2008 20:51:20 +0530 schrieb Kamoolkar, Mugdha:
> Yes, I meant that you need to refer to DSP/BIOS documentation on how
> to create heaps (syntax) within BIOS. The memory to be reserved is
> through TCF of course. Free memory and base address is configurable by
> you through the steps that I had mentioned in the earlier e-mail for
> adding READMEM & WRITEMEM segments.
Yes, thats clear. But my problem is: what are the addresses I can use?
My 6446 has 256MB RAM. Linux is using 118MB. 256-118=138MB. This is the
memory map from readwrite.tcf:
base len length (kByte)
ARM 10008000 4000 16,00
CACHE_L1D 11f10000 8000 32,00
CACHE_L1P 11e08000 8000 32,00
CACHE_L2 11808000 8000 32,00
DDR 8ff00080 fff80 1023,88
DSPLINKMEM 8fe00000 100000 1024,00
IRAM 11800000 8000 32,00
L1DSRAM 11f04000 c000 48,00
READMEM 8fd00000 100000 1024,00
RESET_VECTOR 8ff00000 80 0,13
WRITEMEM 8fc00000 100000 1024,00
-------
43MB
138-43=95. So where are the 95MB? Can I use them for heap?
Bye - Robert
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