topic LPC54607 Run functions into sdram in LPC Microcontrollers

LPC54607 Run functions into sdram

omeraygor — Wed, 09 Feb 2022 06:21:37 GMT

Hi,

My problem is about MCU flash size. Flash size is not enough for me. So want to some of fonctions put into sdram.

in the document, https://www.nxp.com/docs/en/application-note/AN12423.pdf

There is memory allocation section , i saw something like that ;

#define m_sdram_start 0xA0000000 #define m_sdram_size 0x80000 LR_m_sdram_text m_sdram_start m_sdram_size { *(SDRAM_Data) *(SDRAM_Function) core_list_join.o core_matrix.o core_state.o core_util.o }

This is part of linker file.

what does it mean? So core_list_join.o located sdram and others into flash?

i added this into linker file. My fille is;

#!armclang --target=arm-arm-none-eabi -mcpu=cortex-m4 -E -x c /* ** ################################################################### ** Processors: LPC54607J256BD208 ** LPC54607J256ET180 ** ** Compiler: Keil ARM C/C++ Compiler ** Reference manual: LPC546xx User manual Rev.1.9 5 June 2017 ** Version: rev. 1.2, 2017-06-08 ** Build: b190923 ** ** Abstract: ** Linker file for the Keil ARM C/C++ Compiler ** ** Copyright 2016 Freescale Semiconductor, Inc. ** Copyright 2016-2019 NXP ** All rights reserved. ** ** SPDX-License-Identifier: BSD-3-Clause ** ** http: www.nxp.com ** mail: support@nxp.com ** ** ################################################################### */ ; normal flashdan çalisma. #define m_interrupts_start 0x00000000 #define m_interrupts_size 0x00000400 #define m_text_start 0x00000400 #define m_text_size 0x0003FC00 #define m_data_start 0x20000000 #define m_data_size 0x00018000 #define m_usb_sram_start 0x40100000 #define m_usb_sram_size 0x00002000 #define m_sdram_start 0xA0000000 #define m_sdram_size 0x80000 LR_m_sdram_text m_sdram_start m_sdram_size { *(SDRAM_Data) *(SDRAM_Function) core_list_join.o core_matrix.o core_state.o core_util.o } /* USB BDT size */ #define usb_bdt_size 0x0 /* Sizes */ #if (defined(__stack_size__)) #define Stack_Size __stack_size__ #else #define Stack_Size 0x0400 #endif #if (defined(__heap_size__)) #define Heap_Size __heap_size__ #else #define Heap_Size 0x0400 #endif LR_m_text m_interrupts_start m_text_start+m_text_size-m_interrupts_start { ; load region size_region VECTOR_ROM m_interrupts_start m_interrupts_size { ; load address = execution address * (.isr_vector,+FIRST) } ER_m_text m_text_start FIXED m_text_size { ; load address = execution address * (InRoot$$Sections) .ANY (+RO) } RW_m_data m_data_start m_data_size-Stack_Size-Heap_Size { ; RW data .ANY (+RW +ZI) } ARM_LIB_HEAP +0 EMPTY Heap_Size { ; Heap region growing up } ARM_LIB_STACK m_data_start+m_data_size EMPTY -Stack_Size { ; Stack region growing down } } LR_m_usb_bdt m_usb_sram_start usb_bdt_size { ER_m_usb_bdt m_usb_sram_start UNINIT usb_bdt_size { * (*m_usb_bdt) } } LR_m_usb_ram (m_usb_sram_start + usb_bdt_size) (m_usb_sram_size - usb_bdt_size) { ER_m_usb_ram (m_usb_sram_start + usb_bdt_size) UNINIT (m_usb_sram_size - usb_bdt_size) { * (*m_usb_global) } }

But i got errors while compiling.

This is Error:

debug\AIRHMI_NXP_7_INCH_1v0.axf: Error: L6630E: Invalid token start expected number or ( but found S at position 3 on line 12 debug\AIRHMI_NXP_7_INCH_1v0.axf: Error: L6629E: Unmatched parentheses expecting ) but found S at position 3 on line 12 debug\AIRHMI_NXP_7_INCH_1v0.axf: Error: L6226E: Missing base address for region *. C:\Users\omera\AppData\Local\Temp\p5248-3(12): error: L6292E: Ignoring unknown attribute 'SDRAM_Data' specified for region *. C:\Users\omera\AppData\Local\Temp\p5248-3(12): error: L6228E: Expected '{', found ')...'. C:\Users\omera\AppData\Local\Temp\p5248-3(12): error: L6228E: Expected '}', found 'EOF'. Not enough information to list image symbols. Not enough information to list load addresses in the image map. Finished: 2 information, 0 warning and 6 error messages. "debug\AIRHMI_NXP_7_INCH_1v0.axf" - 6 Error(s), 0 Warning(s). Target not created. Build Time Elapsed: 00:00:01

Re: LPC54607 Run functions into sdram

xiangjun_rong — Wed, 09 Feb 2022 07:44:39 GMT

Hi, Omer,

As you know that the SRRAM is volatile memory, after power off, the data/code in SDRAM will disappear.

You have to save code/data in on-chip flash or external flash, if you extend external flash for example spi flash or parallel flash accessed by EMC, it is okay. For example, you can compile a function as data array and save them in external spi flash, after power-on, copy them to on-chip SRAM or SDRAM, then execute.

You can change another LPC processor with large on-chip flash.

Hope it can help you

XiangJun Rong

Re: LPC54607 Run functions into sdram

frank_m — Wed, 09 Feb 2022 07:49:00 GMT

> My problem is about MCU flash size. Flash size is not enough for me. So want to some of fonctions put into sdram.

For a MCU like the LPC546xx, RAM is hardly a solution for overflowing Flash.

Any code to be executed from RAM is copied at runtime from Flash first. You could use external Flash, like QSPI Flash. Or a MCU variant with larger Flash instead.

But for a MCU with limited RAM like Cortex M devices, code execution from RAM most often used for IAP code. Most of this MCUs have only one Flash bank, which cannot execute code while erasing/writing any sector in that bank is ongoing.

Re: LPC54607 Run functions into sdram

omeraygor — Wed, 09 Feb 2022 14:35:11 GMT

Hi again,

i wrote a bootloader, it can be coppy code from external flash to sdram. then execute code from there. But executing from sdram is very slower.

so i want to that bootloader copy some of code sdram and main code is in the flash another location.

Can CPU do that?

a part of code in the sdram execute and main code inside flash memory?

Re: LPC54607 Run functions into sdram

xiangjun_rong — Thu, 10 Feb 2022 02:58:17 GMT

Hi,

Regarding your question that you copy code from SDRAM to another location of flash, I suppose the so-called flash is on-chip flash, we provide IAP function which can program on-chip flash.

For detailed inf, pls refer to Chapter 5: LPC546xx ISP and IAP in UM10912.pdf, the SDK also provides the IAP example code.

Hope it can help you

XiangJun Rong