When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>

SYS_ARCH_TIMER guards the usage of the ARM Generic Timer (aka arch
timer) in U-Boot.
At the moment it is mandatory for ARMv8 and used by a few ARMv7 boards.
Add a proper Kconfig symbol to express this dependency properly,
allowing certain board configuration to later disable arch timer in case
there are any problems with it.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
[tuomas: rebase + fix conflicts and resync with moveconfig & use select]
Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>

The default of DISTRO_DEFAULTS is messy.  Using the 'imply' keyword
is equivalent and cleaner.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

We have a large number of places where while we historically referenced
gd in the code we no longer do, as well as cases where the code added
that line "just in case" during development and never dropped it.

Signed-off-by: Tom Rini <trini@konsulko.com>

This allows using the full SPL framework on mxs devices.  In this
mode, the u-boot.sb image loaded by the boot ROM contains only the
SPL which then loads U-Boot proper or a kernel in falcon mode.

Signed-off-by: Mans Rullgard <mans@mansr.com>

With full SPL enabled, the loaded image overwrites the mxs_spl_data
location.  Moving it a slightly lower address fixes this.

Signed-off-by: Mans Rullgard <mans@mansr.com>

When building in Thumb mode, the linker might generate mode switching
stubs in .glue sections.  Include these in the final link.

Signed-off-by: Mans Rullgard <mans@mansr.com>

The code attempts to preserve the value of LR by storing it in R12/IP
across the lowevel_init() call.  However, this register is not saved
by the callee.  Use a register that guaranteed to be preserved instead.

Signed-off-by: Mans Rullgard <mans@mansr.com>

With the full SPL framework enabled, lowlevel_init() is required.
Make the empty stub weak so boards can override it.

Signed-off-by: Mans Rullgard <mans@mansr.com>