F401RE + NFC05A1 . Error ram overflowed. Any way to make more space ?

[Olivier Bontron]

Error message is

c:/eclipse/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.17.0.201812190825/tools/compiler/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/bin/ld.exe: region `RAM' overflowed by 957840 bytes.

Output.map tells

_estack = 0x20018000

Using eclipse,

Is there any way to make more space so that the code could compile? For this project, I only need 14443A.

Thanks in advance.

Olivier Bontron

[Tesla DeLorean]

What are you doing that needs 1.25MB ​of RAM on a part with a fraction of that?

[Olivier Bontron]

Hi, thanks for answering.

I have been using STM32F4xx-Nucleo-Polling without any problem compiling up to the point where I added 3 files, respectively 100 lines 3k, 100 lines 3k and 500 lines 16k long. No reason to overflow by 1MB.

Olivier

[Tesla DeLorean]

So perhaps some PC centric code with some large arrays?

Review the code to better understand it, and look at the .MAP for likely ​candidates.

[Ozone]

> Output.map tells

> _estack = 0x20018000

This is the location, not the size.

> I only need 14443A.

This are 1.328.186 bytes. Quite a bit more then the 96k your MCU has.

Check your map file.

[Ulysses HERNIOSUS]

Hi,

Maybe you can use ISO 15693 - produces much smaller numbers....

*SCNR*

I think there is some misunderstanding happening: Olivier is referring to ISO14443/A and not to a size of 0x14443a....

But the rest of the comments are right.... Look at the map file if it is created. If not you can always execute one of "fromelf.exe -z", "size" (GNU binutils), "objdump" (GNU binutils) to see the sizes of the obj files. Especially look at the RAM.

Regards, Ulysses

[Olivier Bontron]

Hi

I identified that the error message takes place when I add this code :

#define filter(x) (filterlut[(x) & 0xfffff])

The complete code is : (the context is encryption)

#if !defined LOWMEM && defined __GNUC__

static uint8_t filterlut[1 << 20];

static void __attribute__((constructor)) fill_lut(void)

{

 uint32_t i;

 for (i = 0; i < 1 << 20; ++i)

  filterlut[i] = filter(i);

}

#define filter(x) (filterlut[(x) & 0xfffff])

#endif

Commented : ok

With //#define filter(x) (filterlut[(x) & 0xfffff]) :

It compiles and the map tells :

...

.text.filter  0x00000000    0x68 Middlewares/ST/RFAL/rfal_nfca.o

 .text.startup.fill_lut       0x00000000    0x2 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_create       0x00000000    0x6c Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_destroy        0x00000000    0x4 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_get_lfsr        0x00000000    0x4c Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_bit        0x00000000    0x60 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_byte        0x00000000    0x30 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_word ...

Name       Origin       Length       Attributes

RAM       0x20000000     0x00018000     xrw

FLASH      0x08000000     0x00080000     xr

*default*    0x00000000     0xffffffff

Uncommented : error

With #define filter(x) (filterlut[(x) & 0xfffff])

It does not compile.

The error message :

c:/eclipse/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.17.0.201812190825/tools/compiler/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/bin/ld.exe: STM32F4xx-Nucleo-Polling.elf section `.bss' will not fit in region `RAM'

c:/eclipse/plugins/fr.ac6.mcu.externaltools.arm-none.win32_1.17.0.201812190825/tools/compiler/bin/../lib/gcc/arm-none-eabi/7.3.1/../../../../arm-none-eabi/bin/ld.exe: region `RAM' overflowed by 957832 bytes

and within the map, no mention of filter any longer. It tells :

.text     0x00000000    0x0 Middlewares/ST/RFAL/rfal_nfca.o

 .data     0x00000000    0x0 Middlewares/ST/RFAL/rfal_nfca.o

.text.crypto1_create        0x00000000    0x6c Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_destroy         0x00000000    0x4 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_get_lfsr         0x00000000    0x4c Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_bit         0x00000000    0x64 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_byte         0x00000000    0x30 Middlewares/ST/RFAL/rfal_nfca.o

 .text.crypto1_word        ...

Name       Origin       Length       Attributes

RAM       0x20000000     0x00018000     xrw

FLASH      0x08000000     0x00080000     xr

*default*    0x00000000     0xffffffff

Regards,

Olivier

[Olivier Bontron]

Additional information

Highest address in the 2000xxxx range is         0x20001d88        . = ALIGN (0x8)

Thanks

Olivier

[Ulysses HERNIOSUS]

Hi,

static uint8_t filterlut[1 << 20];

evaluates to:

static uint8_t filterlut[1048576];

The code you are using is not adequate for usage on such a small controller. I see a LOWMEM compile time switch - don't know if it is operational or what it does.

Regards, Ulysses

[Olivier Bontron]

Ulysses,

You were right, that was the culprit and so far, there was no necessity.

Best regards

Olivier Bontron