MQX Software SolutionsのトピックRe: Best way to move RAM usage to external SRAM?

Best way to move RAM usage to external SRAM?

admin — Mon, 28 Feb 2011 23:19:01 GMT

Hello,

I have an MQX system running on an MCF52259 with 1MB of SRAM on the FlexBus. I'm running RTCS, the HTTP server, the shell, Mocana's NanoSSH, and a handfull of my own tasks. My question is this: What's the best way for me to off-load some of the RAM usage from the internal RAM to my external SRAM on the FlexBus? I have the external SRAM working, and I know I can set up a LWmem pool and malloc from that (and I am doing so in my own tasks). However, my task's stacks, and all the native MQX stuff (like RTCS and TCP, and whatever else) is doing a very good job filling up the internal 64K.

Is there a good way to move MQX memory useage to the SRAM instead?

Thanks,

Brad

Re: Best way to move RAM usage to external SRAM?

juanee — Sat, 30 Apr 2011 12:13:15 GMT

Hello,

Did you ever get an answer to your question Brad? I also use an MCF52259 with external SRAM.

Replies are appreciated,

Juan

Codewarrior 10 Special Edition

Windows XP Pro

MQX 3.6.2

PEMicro USB ColdFire Multilink.

Custom Target based on Coldfire MCF52259.

Re: Best way to move RAM usage to external SRAM?

madifazio — Thu, 29 Oct 2020 09:38:04 GMT

Hello,

Im using the following method to put tasks in external RAM using flexbus (in my case MRAM).

Create a space of memory in a pool diferent to the default memory pool and use this space as task stack

Create the task using _task_create_at function from MQX.

#define SOCKET_TASK_STACKSIZE 3000void * SOCKET_TASK_STACK; void socket_task_create(){ _task_id task_id; SOCKET_TASK_STACK = mram_alloc(SOCKET_TASK_STACKSIZE); task_id = _task_create_at(0, SOCKET_TASK, 0, SOCKET_TASK_STACK, SOCKET_TASK_STACKSIZE); if (task_id  == MQX_NULL_TASK_ID)  {  _task_block(); }}_mem_pool_id    _MRAM_pool_id;void mram_create_pool(){    _MRAM_pool_id = _mem_create_pool(BSP_EXTERNAL_MRAM_RAM_BASE, BSP_EXTERNAL_MRAM_RAM_SIZE);    if(_MRAM_pool_id == NULL)    {     _task_block();    }}pointer mram_alloc(int mem_size){ return _mem_alloc_from(_MRAM_pool_id, mem_size); }

Hardware:

TWR-KIT-MCF5225X

TWR-MEM

TWR-LCD

Software

eGUI 2.07

MQX 3.7

CW10.1

Re: Best way to move RAM usage to external SRAM?

madifazio — Thu, 29 Oct 2020 09:38:06 GMT

Other method I use to use external MRAM is declare the location of same variables using the linker command file.

MEMORY

{

......

ram (RW): ORIGIN = 0x20000000, LENGTH = 0x00010000 # SRAM - RW data

ram2 (RW): ORIGIN = 0x10000000, LENGTH = 0x00010000 # MRAM - RW data

.......

}

SECTIONS

{

................

___EXTERNAL_MRAM_BASE = 0x10000000;

___EXTERNAL_MRAM_SIZE = 0x00080000;

___EXTERNAL_MRAM_ROM_BASE = 0x10010000;

___EXTERNAL_MRAM_ROM_SIZE = 0x00000000;

___EXTERNAL_MRAM_RAM_BASE = 0x10010000;

___EXTERNAL_MRAM_RAM_SIZE = 0x00070000;

..........

.main_application_bss2 :

{

data_c.obj (.bss)

} > ram2

.main_application_bss :

{

__START_SBSS = .;

*(.sbss)

*(SCOMMON)

__END_SBSS = .;

__START_BSS = .;

*(.bss)

*(COMMON)

__END_BSS = .;

} >> ram

..........

}

in data.c file:

/* * data.c * *  Created on: 15-abr-2011 *      Author: Marcos Di Fazio *       *      Todas las variables globales definidas en este modulo de  *      compilación van a ir a parar al espacio de memoria de MRAM *      Esto se define desde el linker command file. */// Buffer para textos de registros.char scrRegistros_txtBxTextMRAM[1000];

Hardware:

TWR-KIT-MCF5225X

TWR-MEM

TWR-LCD

Software

eGUI 2.07

MQX 3.7

CW10.1

Re: Best way to move RAM usage to external SRAM?

drummer — Thu, 12 Apr 2012 20:36:23 GMT

I noticed that you got your mocana SSH running. I haven't been able to get mine going yet.

I dont have any of the common header files. My licence seems to work because I am able to see the bean in PE.

How do you link in the library and where are the header files?

My compiler compains that it can't find moptions.h and a whole lot more files that should be on my computer but I can't find them.

Sorry to trouble you with this Brad but I am desperate!

Re: Best way to move RAM usage to external SRAM?

admin — Thu, 12 Apr 2012 21:03:11 GMT

I had to set two compiler flags to make it like the Mocana code. "-gccincludes" to make the Freescale compiler accept the relative include paths used in the Mocana code, and "-relax_pointers" (I don't remember why).

Getting that Mocana stuff going was not fun. This was only part of the issues I ran into.

Re: Best way to move RAM usage to external SRAM?

drummer — Thu, 12 Apr 2012 21:11:43 GMT

I just want to run the demo.

There isn't any instructions on how build the encryption into your project that I can find.

Here is what I have done that doesn't work.

1) Created a stationery project.

2) delete the main.c and include the demo files.

3) add the cau_libv1.1.o

It compains that it cant find the common mocana header files.

I can't find them anywhere on my hard drive.

Re: Best way to move RAM usage to external SRAM?

admin — Thu, 12 Apr 2012 21:40:18 GMT

I'm not sure exactly what you're doing. It doesn't sound like what I was doing.

I'd reccomend contacting Mocana. They were good with providing support to me.

Re: Best way to move RAM usage to external SRAM?

Akshaya_Mukund — Tue, 18 Sep 2012 12:37:28 GMT

I tried the code snippet you mentioned above. I am however not using the allocated memory for a task but for general mallocs used by my application.

I notice a Hard_fault being triggered though by _lwmem_alloc_internal() when the memory Pool validity is checked. Any pointers on. I would appreciate it if you could help me out.

Thanks

Re: Best way to move RAM usage to external SRAM?

Teckna — Wed, 19 Sep 2012 08:43:53 GMT

I use the following instruction in the very first line of the first task creted:

_mem_extend( BSP_EXTERNAL_MRAM_RAM_BASE, BSP_EXTERNAL_MRAM_RAM_SIZE );

Teckna