Fwd: JTAG error with arm-rtems-gdb

[Mario Palomares]

Hi Alan,

I have been asking on the openOCD mailing list and it seems that armv8-a
cores on 32 bit mode is currently under development. Actually it is
supposed to work but they still have to apply some patches. Right now i am
trying one patch they told me, let´s see how it works. I will tell you in
case i achieve something.

Regarding the building of rtems-libbsd i though it could be compiled for
RPI since some GSOC students did that on 2016 (the were working in
improving the BSP)
https://devel.rtems.org/wiki/GSoC/2016.

Regards,
Mario



El lun., 18 may. 2020 a las 18:38, Alan Cudmore (<alan.cudmore at gmail.com>)
escribió:

> Hi Mario,
>
> Yes, what you said makes sense. I don’t have enough experience with the
> GDB and OpenOCD to know if your use case can be made to work. Perhaps
> someone on the raspberrypi.org bare metal forum would know?
>
>
>
> For your inquiry about libdebugger and rtems-libbsd on the Pi: to my
> knowledge there is not complete libbsd support for the Pi models yet. I
> would not expect it to compile right now.
>
>
>
> Please let us know if you make any progress! If you get openOCD debugging
> to work with the Pi2 1.2 (A53), it will also probably work with the Pi 3
> models.
>
>
>
> Alan
>
>
>
> *From: *Mario Palomares <palomares.mario14 at gmail.com>
> *Sent: *Sunday, May 17, 2020 12:38 PM
> *To: *users at rtems.org
> *Cc: *Alan Cudmore <alan.cudmore at gmail.com>
> *Subject: *Fwd: JTAG error with arm-rtems-gdb
>
>
>
>
>
> ---------- Forwarded message ---------
> De: *Mario Palomares* <palomares.mario14 at gmail.com>
> Date: dom., 17 may. 2020 a las 18:33
> Subject: Re: JTAG error with arm-rtems-gdb
> To: Alan Cudmore <alan.cudmore at gmail.com>
>
>
>
> Hi Alan,
>
>
>
> I have done what you told me (set up the whole environment) and it worked.
>
> First i have to configure the RPI to boot on 64 bit mode (just setting a
> parameter on config.txt) and later on could establish GDB connection with
> the gdb the aaarch64 toolchain offers. Gdb-multiarch also worked.
>
>
>
> It seems the problem is on that amrv8-a53 clusters working in 32 bit mode.
> I don´t know if openOCD has support for amv8-a cores working in 32 bit or
> if i have to change my configuration file.
>
>
>
> Does this make sense to you?
>
>
>
> As an alternative in case this doesn´t work i am currently trying to use
> the remote debugging through libdebugger but i am experiencing some
> problems when building the rtems-libbsd library. Should i ask here or
> create another subject?.
>
>
>
> Regards,
>
> Mario
>
>
>
> El sáb., 16 may. 2020 a las 15:58, Alan Cudmore (<alan.cudmore at gmail.com>)
> escribió:
>
> Hello Mario,
>
> Did you try bringing up the complete bare metal environment in the Bare
> Metal Raspberry Pi 3b JTAG blog entry?
>
> I would verify that that environment with the bare metal Aarch64 examples
> work before trying to get the 32 bit RTEMS binaries to work.
>
> It seems like these should work on the Pi2 with the A53 cores
>
> https://metebalci.com/blog/bare-metal-rpi3-programming/
>
> But the UART example might not work due to the differences between how the
> uarts are used on the Pi2 and 3.
>
>
>
> Does the ARM multiarch GDB work with Aarch64? Maybe try the Aarch64 GDB
> mentioned in the bare metal RPI3 blog entry?
>
>
>
> Alan
>
>
>
>
>
> *From: *Mario Palomares <palomares.mario14 at gmail.com>
> *Sent: *Saturday, May 16, 2020 7:41 AM
> *To: *users at rtems.org
> *Subject: *JTAG error with arm-rtems-gdb
>
>
>
> I am tryining to debug RTEMS programs on mi RPI2 through a JTAG conexion
> with OpenOCD. Right now i have the connection correctly established and i
> can connect through a telnet client. Whenever I try to connect through
> arm-rtems5-gdb i get the following error
>
>
>
> warning: while parsing target description (at line 4): Target description
> specified unknown architecture "aarch64"
> warning: Could not load XML target description; ignoring
> Truncated register 16 in remote 'g' packet
>
>
>
> The configuration file i use for the RPI can be found in this page
>
> https://metebalci.com/blog/bare-metal-raspberry-pi-3b-jtag/. :
>
> I can´t use the configuration file proposed here:
>
>
> https://github.com/ppisa/rpi-utils/blob/master/jtag-debug/rpi2/rpi-jt_usb5.cfg by
> Pavel because my RPI is a RPI2 v1.2 which has the same SoC that the RPI3.
> If i try Pavels configuration file the connection fails.
>
>
>
> I have installed gdb multiarch and tried with it but no luck, when i set
> the architecture to aarch64 i get:
>
>
>
> warning: Architecture rejected target-supplied description
> Truncated register 8 in remote 'g' packet
>
>
>
> Any ideas how to get arround this ?
>
>
>
>
>
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