How can I allocate a huge buffer (80KB) from the heap on NRF 9160 setup?

[Rafalino]

Hello , 

Is there a way to allocate a huge buffer (80KB)  on NRF 9160 setup?

I have NRF 9160 connected to  BT840X over UART.

I want to upgrade the BT840X  FW from the NRF 9160 over the UART so I need to get and store the  BT840X FW during this process.

On the NRF 9160 (Zephyr 2.4.0) - it seems that k_alloc/malloc are limited to about  30KB.

Any suggestions on how to overcome this limitation?

Thanks in advance ,

Rafalino.

[Rafalino]

Update -

As I am running in Non-Secure mode, I am thinking of using the flash memory area of image_1 (reserved for secured image) on NRF9160,  to store the image of the  BT840X.

Is there something that I am missing in this approach ?