raspberry BSP: Maybe there is a bug in the linker file?

[Niteesh]

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.gn at gmail.com> wrote:

> Shall I start writing a driver for raspberrypi3 PL011?
>
>
> On Sat, Dec 21, 2019 at 8:40 PM Christian Mauderer <list at 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 at 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.
>>
>
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