error: L6236E: No section matches selector - no section to be FIRST/LAST

Question

I'm new to ARM programming using Keil Microvision V5.12 compiler. I can't compile a simple assembly project getting this error:

.\Objects\learn.sct(7): error: L6236E: No section matches selector - no section to be FIRST/LAST.

I've tried searching and couldn't find any solution for this problem.

This is what I do:

1. Create a project (without the startup file)
2. Add a new assembly file (learn.s)
3. Click Build Target.

Can anybody help?

Answer 1

I Added this answer for newbies,
So, After create new project do same as picture:

Answer 2

There is no 'FIRST' object in your source code. Your scatter file likely looks something like:

LR_IROM1 0x08000000 0x00040000  {    ; load region size_region
  ER_IROM1 0x08000000 0x00040000  {  ; load address = execution address
   *.o (RESET, +First)
   *(InRoot$$Sections)
   .ANY (+RO)
  }
  RW_IRAM1 0x20000000 0x0000A000  {  ; RW data
   .ANY (+RW +ZI)
  }
}

The _FIRST object that the linker wants to put into the image is the area called RESET. You do not have a RESET region in your code. Add something along the lines of

AREA    RESET, DATA, READONLY

to your assembly file where you want execution to begin.

Create a project with the startup file and look for the AREA RESET ..... declaration and copy that.

For Cortex it looks like:

                AREA    RESET, DATA, READONLY
                EXPORT  __Vectors
                EXPORT  __Vectors_End
                EXPORT  __Vectors_Size

__Vectors       DCD     __initial_sp               ; Top of Stack
                DCD     Reset_Handler              ; Reset Handler
                DCD     NMI_Handler                ; NMI Handler
                DCD     HardFault_Handler          ; Hard Fault Handler
                DCD     MemManage_Handler          ; MPU Fault Handler
                DCD     BusFault_Handler           ; Bus Fault Handler
                DCD     UsageFault_Handler         ; Usage Fault Handler
                DCD     0     

Each of those handlers needs to be declared, but you can just add the stack pointer and reset handler to get started.