Bare-Metal not working on Arty-a7-100t

[Alis-M]

I'm trying to run the bare-metal program on Arty-a7-100t, but I run into an error when trying to download the program on the board:

xsdb% dow -clear boot.elf
Downloading Program -- /home/alis/vivado-risc-v/bare-metal/hello-world/boot.elf
section, .text: 0x80000000 - 0x8000055d
section, .bss: 0x8000055e - 0x8000055f
100% 0MB 0.0MB/s 00:00
Setting PC to Program Start Address 0x80000008
Successfully downloaded /home/alis/vivado-risc-v/bare-metal/hello-world/boot.elf
xsdb% Info: Hart #0 (target 3) Stopped at 0x10f50 (Suspended)
_start() at head.S: 6
6: li sp, BOOT_MEM_END

My understanding is that, when I generate the elf file, the whole .data section is missing. I tried to fix that using a different compiler, but that didn't fix the issue. This is what I get when running "make clean all":

boot.elf: formato del file elf64-littleriscv

Program Header:
0x70000003 off 0x000000000000155e vaddr 0x0000000000000000 paddr 0x0000000000000000 align 20
filesz 0x0000000000000041 memsz 0x0000000000000000 flags r--
LOAD off 0x0000000000001000 vaddr 0x0000000080000000 paddr 0x0000000080000000 align 212
filesz 0x000000000000055e memsz 0x000000000000055e flags r-x
LOAD off 0x000000000000055e vaddr 0x000000008000055e paddr 0x000000008000055e align 2**12
filesz 0x0000000000000000 memsz 0x0000000000000002 flags rw-

Sezioni:
Idx Name Size VMA LMA File off Algn
0 .text 0000055e 0000000080000000 0000000080000000 00001000 23
CONTENTS, ALLOC, LOAD, READONLY, CODE
1 .bss 00000002 000000008000055e 000000008000055e 0000155e 20
ALLOC
2 .riscv.attributes 00000041 0000000000000000 0000000000000000 0000155e 20
CONTENTS, READONLY
3 .comment 0000001b 0000000000000000 0000000000000000 0000159f 20
CONTENTS, READONLY
4 .debug_line 000004c6 0000000000000000 0000000000000000 000015ba 20
CONTENTS, READONLY, DEBUGGING, OCTETS
5 .debug_line_str 0000009f 0000000000000000 0000000000000000 00001a80 20
CONTENTS, READONLY, DEBUGGING, OCTETS
6 .debug_info 000003b1 0000000000000000 0000000000000000 00001b1f 20
CONTENTS, READONLY, DEBUGGING, OCTETS
7 .debug_abbrev 000001eb 0000000000000000 0000000000000000 00001ed0 20
CONTENTS, READONLY, DEBUGGING, OCTETS
8 .debug_aranges 00000090 0000000000000000 0000000000000000 000020c0 24
CONTENTS, READONLY, DEBUGGING, OCTETS
9 .debug_str 000001e1 0000000000000000 0000000000000000 00002150 20
CONTENTS, READONLY, DEBUGGING, OCTETS
10 .debug_frame 00000110 0000000000000000 0000000000000000 00002338 2**3
CONTENTS, READONLY, DEBUGGING, OCTETS

Is there any way I can fix this to download and run the program?

[eugene-tarassov]

You need to use stop command to stop processor before downloading, and to use con command to continue processor after downloading. Actually, stop is optional - dow stops CPU if not stopped, but you have to use con to run the program.