There is already a PL011 driver in the arm shared section. should we just import it?
On Sat, Dec 21, 2019 at 10:46 PM Niteesh <gsnb...@gmail.com> wrote: > Shall I start writing a driver for raspberrypi3 PL011? > > > On Sat, Dec 21, 2019 at 8:40 PM Christian Mauderer <l...@c-mauderer.de> > wrote: > >> On 19/12/2019 15:05, Christian Mauderer wrote: >> > On 19/12/2019 14:27, Sebastian Huber wrote: >> >> On 19/12/2019 14:24, Christian Mauderer wrote: >> >>> Hello, >> >>> >> >>> triggered by the discussion regarding RTEMS on raspberrypi 3 I did >> some >> >>> tests. I haven't been able to start a RTEMS on my Pi 1 if I tried a >> >>> version after commit c5fd79cd4704a4270ba0114a1009ab8556f997c9 from >> >>> 29.07.2019. Right before it everything works as expected. >> >>> >> >>> The commit changes the memory locations. From what I understood, the >> >>> bootloader on a raspberry always jumps to address 0x8000 after loading >> >>> the application. So I'm not convinced that the change is correct. >> >> >> >> Is the 0x8000 a fixed address or you configure this in a boot image >> header? >> >> >> > >> >>From what I've seen the bootloader just uses a fixed address. All guides >> > that I've found just use objcopy to generate a binary from the elf files >> > without adding a header. For example a guide for RTEMS: >> > >> > >> > >> http://alanstechnotes.blogspot.com/2013/03/running-your-first-rtems-program-on.html >> > >> > A FreeRTOS port mentions this behavior explicitly in a comment in the >> > linker file: >> > >> > >> > >> https://github.com/jameswalmsley/RaspberryPi-FreeRTOS/blob/master/raspberrypi.ld#L17 >> > >> > The "graphics processor" is no typo here. It seems the initialization is >> > really done by the graphics processor on the pi. >> > _______________________________________________ >> > devel mailing list >> > devel@rtems.org >> > http://lists.rtems.org/mailman/listinfo/devel >> > >> >> I just found an option: It is possible to set a "kernel_address" in the >> config.txt: >> >> >> https://www.raspberrypi.org/documentation/configuration/config-txt/boot.md >> >> So the start address can be changed and maybe the adaption to the linker >> file isn't necessary. >> >
_______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
