NRF52832 can not use 64K RAM

RE: NRF52832 can not use 64K RAM

vincent.golle — Mon, 24 Oct 2016 12:36:42 GMT

I had the impression engineering A actually had two separate 32kB of RAM in separate regions: 0x20000000 and 0x08000000 Using both regions in Keil is easy, but having a linker script doing the same is more tricky... and that is what we are interested in !

RE: NRF52832 can not use 64K RAM

Stefan Birnir Sverrisson — Mon, 24 Oct 2016 12:15:46 GMT

The nRF52832 engineering A revision was limited to 32kB RAM, but that should have been fixed with Engineering B, see this thread. I see in both nRF5 SDK 11 and 12 examples that RAM region is set for 64kB, i.e. in the linker script:

MEMORY
{
  FLASH (rx) : ORIGIN = 0x0, LENGTH = 0x80000
  RAM (rwx) :  ORIGIN = 0x20000000, LENGTH = 0x10000
}

RE: NRF52832 can not use 64K RAM

vincent.golle — Mon, 24 Oct 2016 10:31:08 GMT

Hi all, I would also be very interested to get the linker scripts allowing to split the nRF52 memory between the two 32ko blocks...

RE: NRF52832 can not use 64K RAM

Michael Lamming — Sun, 05 Jun 2016 12:52:55 GMT

Did this question get answered?

RE: NRF52832 can not use 64K RAM

Chris — Thu, 12 Nov 2015 22:39:32 GMT

I'd imagine doing something like having two RAM regions.

  RAM (rwx) :  ORIGIN = 0x20002800, LENGTH = 0x5800
  RAM (rwx) :  ORIGIN = 0x08000000, LENGTH = 0x8000

RE: NRF52832 can not use 64K RAM

Chris — Thu, 12 Nov 2015 22:38:35 GMT

I have this problem too. I've ported a driver for an accelerometer and it needs more than the 32kb which is the default allowance (well, minus 0x2800 bytes for the SD) in the linker file for GCC.

If I just have the application use the second 32kb then the app complains when initialising the SD.

How do I modify the linker for GCC to allow for two RAM regions?

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

MEMORY
{
  FLASH (rx) : ORIGIN = 0x1f000, LENGTH = 0x61000
  RAM (rwx) :  ORIGIN = 0x20002800, LENGTH = 0x5800
}

INCLUDE "nrf5x_common.ld"

Without the bug I'd just set the length longer (to allow for 64k) but at the moment I'm a bit stuck on how to achieve this..