Loading RTEMS applications from u-boot on Raspberry Pi 2

[Niteesh G. S.]

Hii Cláudio,

On Fri, 21 Feb, 2020, 4:55 AM Cláudio Maia (clrrm), <CLRRM at isep.ipp.pt>
wrote:

> Hi Niteesh,
>
> Thank you for your input. Following your suggestion allowed me to boot
> successfully RTEMS from u-boot.
> Moreover, I confirm that “-O rtems" does not work for me as well.
>

Your welcome :)

I have a few questions that I would like to ask you. What exactly is going
> on when we execute “bootm 0x200000 - 0x1000”?
> The address where we load the dtb is far apart from the one where we load
> the .img, so why do we need to boot the .img 0x1000 bytes below 0x200000?
> What is the relation between both, if any?
>

That's just the syntax for bootm.
bootm ${kernel_addr} - ${fdt_addr}

But, bootm  ${kernel_addr}  ${fdt_addr} should also work I guess but I am
not sure. Can you try that and please let me know?

Thank you,
Niteesh.

Regards,
> Cláudio
>
> > On 18 Feb 2020, at 15:56, Niteesh G. S. <niteesh.gs at gmail.com> wrote:
> >
> > Hii,
> >
> > Regarding loading RTEMS images using U-Boot. It is
> > necessary that you provide a DTB file.
> >
> > So, your commands should be
> >
> > $ mkimage -A arm -O linux -T kernel -a 0x200000 -e 0x200080 -d
> kernel.img -C none rtems.img
> >
> > Can you please let me know if -O rtems works for you. I have tried
> > using it but got no output.
> >
> > U-Boot> fatload mmc 0:1 0x200000 rtems.img
> > U-Boot> fatload mmc 0:1 0x1000 bcm2709-rpi-2-b.dtb or bcm2710-rpi-2-b.dtb
> > The DTB file should be choosed according to the board version.
> > U-Boot> bootm 0x200000 - 0x1000
> >
> > Thanks,
> > Niteesh.
>
>
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