BBB u-boot

[Sichen Zhao]

> Hi,
>
> I built u-boot from the git master repo for the Beaglebone Black and I have been
> working with an RTEMS u-boot type image plus a local patch to by pass
> `bsp_fdt_copy` that is now called for this board. With the change there is a
> crash as `r3` is not valid with the RTEMS OS entry.
>
> I have also tested a Linux image format and the kernel crashes early in
> `bsp_start_hook_1`. This is with the same patch to by pass `bsp_fdt_copy`.
>
> What configuration was used to test the GSoC code?
Can you please tell me which version of u-boot you used?
My version is old: U-Boot SPL 2014.04-00014-g47880f5 (Apr 22 2014 - 
13:23:54)

Best regards
Sichen
>
> The change to add `bsp_fdt_copy` has created an inconsistency because u-boot
> master has support for RTEMS images which uses the RTEMS OS boot entry and the
> parameters used for that call are different to the ARM specific Linux entry
> parameters. It is sensible for someone, me in this case, to use an RTEMS image
> on RTEMS however this hidden dependence on a Linux type image makes using RTEMS
> difficult. I am ok with having the upstream u-boot RTEMS OS support removed
> however we need to have a working BBB before this can happen.
>
> I have created https://devel.rtems.org/ticket/3152 to track the issue.
>
> Chris
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