The relationship between STM32743 SPI_DMA and D1 RAM

[pass3master]

When using HAL_SPI_Transmit_DMA with STM32743, must the transmission data buffer and reception data buffer be placed in D1 RAM?
Also, is there a way to dynamically allocate D1 RAM? Rather than declaring an array placed in section("D1"), I would like to dynamically allocate it like malloc. Is this possible?

[AScha.3]

>must the transmission data buffer and reception data buffer be placed in D1 RAM?

see rm , where the different dma's connect to ->

>is there a way to dynamically allocate D1 RAM

Note also that if you use ST's STM32CubeIDE that uses GCC and Newlib and has the syscalls layer implemented already.

in newlib is malloc : 

#include <stdlib.h>
void *malloc(size_t nbytes);

 just try it.