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linux4sam / at91bootstrap

Second level bootloader for Microchip SoC (aka AT91)
https://www.linux4sam.org/linux4sam/bin/view/Linux4SAM/AT91Bootstrap4
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Debugging with Eclipse on Linux #153

Closed lnksz closed 2 years ago

lnksz commented 2 years ago

Hi there!

I am trying to get more elaborate debugging experience to contribute to the at91bootstrap project.

I found a tutorial on Linux4SAM on how to configure Eclipse CDT and a JTAG debugger to be able to set use GDB features.

But following the tutorial I noticed, that it is quite dated and some links don't work, or the Zylin plug-in fails to be installed. (Using latest Eclipse 2022-03)

I also found the jlink-plugin which is relying on the cPack manager.

After some try-and-error I got the setup working so far that I can connect to my SAMA5A3Xplained board by clicking on Debug and the download of the built binary is successful. But after the reset is issued the CPU starts running and the registers cannot be read out.

Anyway.. it may be a of a more general interest as well to have an updated version of the Linux4SAM tutorial to enable easier contribution to the project.

Can any of the maintainers help out? You surely have a working set-up at hand, right?

ehristev commented 2 years ago

Hi,

Can any of the maintainers help out? You surely have a working set-up at hand, right?

While I would like to say yes... I can only say no. I never used Eclipse with at91bootstrap, actually last time I used Eclipse was around 2011 I think...

I will ask around if someone tried it, but don't get your hopes up.

Eugen

lnksz commented 2 years ago

Thanks! I have installed Eclipse only for this... So I if you have a different tool I am more then open for alternatives!

lnksz commented 2 years ago

With all respect and knowing how non-critical this is, may I ask you if there is any news in the maintainer circle about this? Thanks!

ehristev commented 2 years ago

No news. @noglitch or @nirvann , @TonyHan11 @junminlin maybe have some suggestions to share about how they work with debugging at91bootstrap

nirvann commented 2 years ago

@lnksz, Hi, The reference debugger is... GDB on the command line. MPLAB X IDE too may be used to debug AT91Bootstrap, but not with SAMA5D3x MPUs. Regarding Eclipse, for sure it would be nice to spot the necessary updates to the tutorial.

The toolchain first should be updated to a newer version, though not necessarily the latest. E.g. GNU Arm Embedded Toolchain 8-2018-q4-major (GCC 8.2.1).

The SEGGER J-Link GDB Server may be updated to the latest J-Link Software Pack. Typical options are: JLinkGDBServer -select USB -device Cortex-A5 -endian little -if SWD -speed auto -ir -LocalhostOnly If options aren't given to J-Link GDB Server as arguments, it offers a GUI to set them. The Target interface may also be set to the 4-wire JTAG, alternatively. According to SEGGER, adaptive clocking is only available for ARM 7/9 targets, not for Cortex-A/R/M targets. Therefore, Speed should be assigned Auto Selection as above. At this point it would help to start arm-none-eabi-gdb, and check it can start a debug session successfully.

As an alternative to Eclipse, one may give a try to Visual Studio Code with the gnu-debugger extension.

lnksz commented 2 years ago

Hi @nirvann ,

Thank you for the aid!

With the JLinkGDBServer settings and the linked toolchain's gdb I could establish a debugging session.

Following the instructions in the Segger Wiki for the GDB CLI I can enjoy the familiar GDB experience.

After this adding a different front-end is secondary for me.