Linker script: what are the differences between XXX_FLASH.id and XXX_RAM.id?

[GPHIL.1]

Hello,

Can you tell me the differences between two files linker script

STM32... FLASH.id and STM32...RAM.id

Regards,

[TDK]

FLASH puts the program in FLASH. RAM puts it in RAM. Since you want your program to stay in memory after power is lost, you typically want the FLASH file.

I don't really understand why they include the RAM linker script at all. It's not very useful.

[SofLit]

It could be useful for quick tests or benchmarks like system performance or power consumption.

[GPHIL.1]

Thanks for response,

I use the flash.id to declare a backupsram section

like

MEMORY

{

RAM_D1 (xrw) : ORIGIN = 0x24000000, LENGTH = 512K

FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 1024K /* Memory is divided. Actual start is 0x08000000 and actual length is 2048K */

DTCMRAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K

RAM_D2 (xrw) : ORIGIN = 0x30000000, LENGTH = 288K

RAM_D3 (xrw) : ORIGIN = 0x38000000, LENGTH = 64K

ITCMRAM (xrw) : ORIGIN = 0x00000000, LENGTH = 64K

BKPRAM (rw) : ORIGIN = 0x38800000, LENGTH = 4k

}

.save_data (NOLOAD) :

{

. = ALIGN(4);

. = ABSOLUTE(0x38800000);

. = ALIGN(4);

} >BKPRAM

[Tesla DeLorean]

It's LD (Lima Delta) not id

The RAM version would be to produce an object that's delivered / loaded directly into ram and executed in place, rather the where the core is in FLASH, and unpacks / initializes RAM at each startup.

Which STM32, the MPU or MCU variants?