Debugging - GNU ARM Bare Metal Development - eclipse

Question

I am trying to debug a sample code given by Atmel. I have built the program successfully.
For debugging, I am using eclipse plusgdb plus JlinkGDBServer plus onboard Jtag.
Although the program can be downloaded to the board and is running well, I can't debug the program. Everytime I launch a debug session, the JLinkGDBServer will be terminated with an error as below:
Below are the messages shown in the console for each program termination:
JLinkGDBServer
SEGGER J-Link GDB Server V4.96g Command Line Version
JLinkARM.dll V4.96g (DLL compiled Feb 6 2015 17:54:32)
-----GDB Server start settings-----
GDBInit file: none
GDB Server Listening port: 2331
SWO raw output listening port: 2332
Terminal I/O port: 2333
Accept remote connection: localhost only
Generate logfile: on
Verify download: on
Init regs on start: on
Silent mode: off
Single run mode: on
Target connection timeout: 5 ms
------J-Link related settings------
J-Link Host interface: USB
J-Link script: none
J-Link settings file: none
------Target related settings------
Target device: Cortex-A5
Target interface: JTAG
Target interface speed: 1000kHz
Target endian: little
Connecting to J-Link...
J-Link is connected.
Firmware: J-Link OB-SAM3U128 V1 compiled Nov 28 2014 10:24:11
Hardware: V1.00
S/N: 480300770
Checking target voltage...
Target voltage: 3.30 V
Listening on TCP/IP port 2331
Connecting to target...
J-Link found 1 JTAG device, Total IRLen = 4
JTAG ID: 0x4BA00477 (Cortex-A5)
Connected to target
Waiting for GDB connection...Connected to 127.0.0.1
Reading all registers
Read 4 bytes # address 0x00000000 (Data = 0xE59FF070)
Target interface speed set to 1000 kHz
Resetting target
Halting target CPU...
...Target halted (PC = 0x00000000)
PC = 00000000, CPSR = 000001D3 (SVC mode, ARM FIQ dis. IRQ dis.)
R0 = 00000004, R1 = 0031E0C3, R2 = 00016AAD, R3 = 00016965
R4 = 0031FFA0, R5 = C0542A08, R6 = C0512000, R7 = C051DA90
USR: R8 =C051DD80, R9 =410FC051, R10=C0512000, R11 =0031FF94, R12 =003020C0
R13=BEBF5C70, R14=B6F12F1C
FIQ: R8 =9ABE0586, R9 =7E72A55E, R10=73DBFC6B, R11 =4F6717CF, R12 =05EDA809
R13=5AC81462, R14=24683958, SPSR=370D2C67
SVC: R13=0031FF80, R14=00300620, SPSR=000001D3
ABT: R13=C0542B4C, R14=C000DC80, SPSR=A0000193
IRQ: R13=00320000, R14=80000053, SPSR=80000053
UND: R13=C0542B58, R14=C000DB60, SPSR=60000093
Reading all registers
Select auto target interface speed (1000 kHz)
Flash breakpoints enabled
Semi-hosting enabled (VectorAddr = 0x08)
Semihosting I/O set to TELNET and GDB Client
Downloading 15488 bytes # address 0x00300000 - Verified OK
Writing register (PC = 0x00300080)
GDB closed TCP/IP connection
Connected to 127.0.0.1
Reading all registers
Read 4 bytes # address 0x00300080 (Data = 0xF1080100)
Resetting target
Writing register (PC = 0x00300000)
Writing register (PC = 0x00300000)
Starting target CPU...
GDB closed TCP/IP connection
arm-none-eabi-gdb
Warning: the current language does not match this frame.
The target endianness is set automatically (currently little endian)
Semihosting and SWV
SEGGER J-Link GDB Server V4.96g - Terminal output channel
Connection closed by the GDB server.
The following is my debugging configuration:
Under the Run Commands, the commands in the box are as below:
target remote localhost:2331
monitor reset
load
mon reg pc = 0x300000
mon reg pc = 0x300000
end
I dont know what root cause is. I suspect that it is arm-none-eabi-gdb that causes the JLinkGDBServer to terminate with an exit code of -1.
Please help.
Edit 1
FYI, I am using SAMA5D3x-EK development board.

Answer 1

It is difficult to say, but looks like if the processor is having an exception while loading your code. I suggest to verify the load address of the sections of your ELF file, and review the linker settings of your project.
Hope it helps...