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.cudm...@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.mari...@gmail.com> > *Sent: *Sunday, May 17, 2020 12:38 PM > *To: *users@rtems.org > *Cc: *Alan Cudmore <alan.cudm...@gmail.com> > *Subject: *Fwd: JTAG error with arm-rtems-gdb > > > > > > ---------- Forwarded message --------- > De: *Mario Palomares* <palomares.mari...@gmail.com> > Date: dom., 17 may. 2020 a las 18:33 > Subject: Re: JTAG error with arm-rtems-gdb > To: Alan Cudmore <alan.cudm...@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.cudm...@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.mari...@gmail.com> > *Sent: *Saturday, May 16, 2020 7:41 AM > *To: *users@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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