ROM and RAM Management

RE: ROM and RAM Management

paul_tanner — Sun, 17 Dec 2017 16:53:52 GMT

Thx @eliotstock. I should have thought of that. It works fine when run as you suggest.

I suspect that the stack is too small (8K). I am compiling for nRF52 with SDK12.2, S132 and armgcc which does not use arm_startup_nrf52.s (mentioned above). Stack size is not mentioned in the provided linker script.

What is the recommended way of increasing the stack pls?

SEARCH_DIR(.)
GROUP(-lgcc -lc -lnosys)

MEMORY
{
  FLASH (rx) : ORIGIN = 0x1f000, LENGTH = 0x61000
  RAM (rwx) :  ORIGIN = 0x20002128, LENGTH = 0xded8	
}

SECTIONS
{
  .fs_data :
  {
    PROVIDE(__start_fs_data = .);
    KEEP(*(.fs_data))
    PROVIDE(__stop_fs_data = .);
  } > RAM
  .pwr_mgmt_data :
  {
    PROVIDE(__start_pwr_mgmt_data = .);
    KEEP(*(.pwr_mgmt_data))
    PROVIDE(__stop_pwr_mgmt_data = .);
  } > RAM
} INSERT AFTER .data;

INCLUDE "nrf5x_common.ld"

RE: ROM and RAM Management

Eliot Stock — Thu, 14 Dec 2017 21:47:01 GMT

@paul_tanner It no longer works if you run it from Github web hosting, but if you git clone the repo and open the HTML file in your browser, it should. Try that and submit a bug if not. Paste in your console output. Thanks.

RE: ROM and RAM Management

paul_tanner — Wed, 13 Dec 2017 10:05:10 GMT

@eliotstock I was hopeful using your tool to understand the .map file for nRF52 produced by armgcc. however, when I browse to my map file I get a blank screen. Should this still work? Thx.

RE: ROM and RAM Management

coolnumber9 — Sun, 20 Aug 2017 13:43:58 GMT

@eliotstock : Does your tool work with nrf52832 project and a map file generated by Keil MDK ARMCC? I tried uploading my map file but it did not show me the visualization. Kindly help. Thanks.

RE: ROM and RAM Management

coolnumber9 — Sun, 20 Aug 2017 13:38:08 GMT

@hkn, @oyvakar : What is the difference between the ROM/RAM usage on 'build output window' log we see in uVision IDE compared to the generated map file? They have different size values for Code, RO Data, RW Data, and ZI Data when added up. I am using Keil MDK.

Build output window:

Program Size: Code=82628 RO-data=65012 RW-data=1136 ZI-data=54672

But in the generated map file (nrf52832_xxaa_s132.map), the total figures do not match compared to the above:

Code (inc. data)   RO Data    RW Data    ZI Data      Debug   

 70816       5458      63684        976      46016    1206351   Grand Totals
 70816       5458      63684        212      46016    1206351   ELF Image Totals (compressed)
 70816       5458      63684        212          0          0   ROM Totals

Total RO  Size (Code + RO Data)               134500 ( 131.35kB)
Total RW  Size (RW Data + ZI Data)             46992 (  45.89kB)
Total ROM Size (Code + RO Data + RW Data)     134712 ( 131.55kB)

RE: ROM and RAM Management

Brook Gebremedhin — Wed, 20 Apr 2016 12:45:42 GMT

@hkn, @oyvakar

I tried you setting for custom board 16k:

FLASH (rx) : ORIGIN = 0x0001C000, LENGTH = 0x24000 RAM (rwx) : ORIGIN = 0x20002800, LENGTH = 0x1800

with the setting you mentioned above for the example ble_notification i get the error shown below after "make"

/usr/local/Cellar/gcc-arm-none-eabi/20140805/bin/../lib/gcc/arm-none-eabi/4.8.4/../../../../arm-none-eabi/bin/ld: region RAM overflowed with stack
collect2: error: ld returned 1 exit status
make: *** [nrf51422_xxac_s130] Error 1

RE: ROM and RAM Management

Eliot Stock — Fri, 04 Dec 2015 14:09:38 GMT

I've put a little tool for visualising your memory usage here:

github.com/.../memory

It uses D3.js for the chart. You can use it right on Github without downloading anything. Just select your *.Map file. Pull requests welcome.

RE: ROM and RAM Management

Håkon Alseth — Wed, 29 Jul 2015 06:46:12 GMT

Hi Alex,

Only IAR can comment on this particular compiler optimisation and how it works under-the-hood. I've not seen that much issues with high optimisation in IAR (including enabling static clustering), but I've seen some issues when you enable "Multi-file Compilation".

Cheers, Håkon

RE: ROM and RAM Management

Alex — Tue, 28 Jul 2015 13:59:10 GMT

Can Nordic comment on code optimization in IAR? Static clustering has mentioned here as a problem if optimization is enabled with DFU. Is there any other limitations?