Solved
Reallocation of SRAM memory to STM32MP157A
Hi everyone!
By default, the linker file describes that the memory partitions are configured as:
- RETRAM - ISR Vector;
- SRAM1 - Code;
- SRAM2 - Data;
- SRAM3 - buffer IPC;
- SRAM4 - not used in .ld file, but in device tree it's DMA1/DMA2 buffer.
My application does not need DMA buffers and I want to use this memory efficiently, namely:
- RETRAM - ISR Vector;
- SRAM1+SRAM2 - Code;
- SRAM3 - Data;
- SRAM4 - buffer IPC;
To do this, I change the linker file accordingly:
/**
******************************************************************************
* @file LinkerScript.ld
* @author Auto-generated by STM32CubeIDE
* Abstract : Linker script for STM32MP157A-DK1 Board embedding STM32MP157AACx Device from STM32MP1 series
* 128Kbytes FLASH
* 128Kbytes RAM1
* 128Kbytes RAM2
*
* Set heap size, stack size and stack location according
* to application requirements.
*
* Set memory bank area and size if external memory is used
******************************************************************************
* @attention
*
* <h2><center>© Copyright (c) 2020 STMicroelectronics.
* All rights reserved.</center></h2>
*
* This software component is licensed by ST under BSD 3-Clause license,
* the "License"; You may not use this file except in compliance with the
* License. You may obtain a copy of the License at:
* opensource.org/licenses/BSD-3-Clause
*
******************************************************************************
*/
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = ORIGIN(SRAM3) + LENGTH(SRAM3); /* end of "SRAM3" Ram type memory */
_Min_Heap_Size = 0x200 ; /* required amount of heap */
_Min_Stack_Size = 0x400 ; /* required amount of stack */
/* Memories definition */
MEMORY
{
RETRAM (xrw) : ORIGIN = 0x00000000, LENGTH = 64K
SRAM12 (rx) : ORIGIN = 0x10000000, LENGTH = 256K
SRAM3 (xrw) : ORIGIN = 0x10040000, LENGTH = 64K
SRAM4 (xrw) : ORIGIN = 0x10050000, LENGTH = 64K
}
/* Symbols needed for OpenAMP to enable rpmsg */
__OPENAMP_region_start__ = ORIGIN(SRAM4);
__OPENAMP_region_end__ = ORIGIN(SRAM4)+LENGTH(SRAM4);
/* Sections */
SECTIONS
{
/* The startup code into "RETRAM" Ram type memory */
.isr_vector :
{
. = ALIGN(4);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} >RETRAM
/* The program code and other data into "SRAM1" Rom type memory */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)
KEEP (*(.init))
KEEP (*(.fini))
. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
} >SRAM12
/* Constant data into "SRAM1" Rom type memory */
.rodata :
{
. = ALIGN(4);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
} >SRAM12
.ARM.extab : {
. = ALIGN(4);
*(.ARM.extab* .gnu.linkonce.armextab.*)
. = ALIGN(4);
} >SRAM12
.ARM : {
. = ALIGN(4);
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
. = ALIGN(4);
} >SRAM12
.preinit_array :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
. = ALIGN(4);
} >SRAM12
.init_array :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
. = ALIGN(4);
} >SRAM12
.fini_array :
{
. = ALIGN(4);
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
. = ALIGN(4);
} >SRAM12
/* Used by the startup to initialize data */
__DATA_ROM = .;
_sidata = LOADADDR(.data);
/* Initialized data sections into "SRAM3" Ram type memory */
.data : AT(__DATA_ROM)
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */
. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >SRAM3
__DATA_END = __DATA_ROM + (_edata - _sdata);
text_end = ORIGIN(SRAM12) + LENGTH(SRAM12);
ASSERT(__DATA_END <= text_end, "region SRAM12 overflowed with text and data")
.resource_table :
{
. = ALIGN(4);
KEEP (*(.resource_table*))
. = ALIGN(4);
} >SRAM3
/* Uninitialized data section into "SRAM3" Ram type memory */
. = ALIGN(4);
.bss :
{
/* This is used by the startup in order to initialize the .bss secion */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)
. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >SRAM3
/* User_heap_stack section, used to check that there is enough "SRAM3" Ram type memory left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >SRAM3
/* Remove information from the compiler libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
}I am also editing the device tree file(edit adress from 10040000 for IPC to 10050000 (SRAM4)):
mcuram2:mcuram2@10000000{
compatible = "shared-dma-pool";
reg = <0x10000000 0x40000>;
no-map;
};
vdev0vring0:vdev0vring0@10050000{
compatible = "shared-dma-pool";
reg = <0x10050000 0x1000>;
no-map;
};
vdev0vring1:vdev0vring1@10051000{
compatible = "shared-dma-pool";
reg = <0x10051000 0x1000>;
no-map;
};
vdev0buffer:vdev0buffer@10052000{
compatible = "shared-dma-pool";
reg = <0x10052000 0x4000>;
no-map;
};
mcuram:mcuram@30000000{
compatible = "shared-dma-pool";
reg = <0x30000000 0x40000>;
no-map;
};
retram:retram@38000000{
compatible = "shared-dma-pool";
reg = <0x38000000 0x10000>;
no-map;
};
gpu_reserved:gpu@d4000000{
reg = <0xd4000000 0x4000000>;
no-map;
};And i delete it:
&sram {
dma_pool: dma_pool@0 {
reg = <0x50000 0x10000>;
pool;
};And it:
&dma1 {
sram = <&dma_pool>;
};
&dma2 {
sram = <&dma_pool>;
};But nevertheless, my application on the M4 core runs only in engineering mode. In production mode, the application hangs in an infinite loop:
Снимок �?крана от 2021-09-07 11-28-15