Add support for the Motorola 68040 architecture. Currently, m68k
support in U-Boot is primarily focused on ColdFire variants. Introduce
the necessary infrastructure to support the classic M680x0 series,
specifically targeting the M68040 as emulated by QEMU.

The implementation includes exception vectors, early startup code, and
minimal CPU initialization and relocation stubs. It also defines the
standard m68k boot information structure used for passing hardware
information to the operating system. To ensure compatibility, ColdFire-
specific library objects such as cache and interrupt handling are
excluded from the build when M68040 is selected.

Additionally, apply a specific workaround during the early memory
reservation stage. Use a manual loop to clear global data instead of
the standard memset() function, as utilizing memset() at this point was
observed to cause a hang on the QEMU platform.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Acked-by: Angelo Dureghello <angelo@kernel-space.org>
Reviewed-by: Simon Glass <simon.glass@canonical.com>

The way DECLARE_GLOBAL_DATA_PTR is used, the stuff under #if 0 can
never compile as you cannot have a non-constant initializer at global
scope (and one would get linker errors as well because the 'gd' symbol
would be defined in multiple TUs).

Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>
Acked-by: Angelo Dureghello <angelo@kernel-space.org>

Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>

Modifying a generic header like watchdog.h, removing not directly used
asm/ptrace.h header relies on whoever includes it to already have
included something that defines the type ulong.

Make the asm/ptrace.h header self-contained by including the proper
header.

Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Stefan Roese <sr@denx.de>

Only m68k and powerpc use this field, so move it to the arch-specific
info, to reduce the size for other archs.

Signed-off-by: Simon Glass <sjg@chromium.org>

Drop all duplicate newlines. No functional change.

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>

The implementation of icache_invalid appears to be doing what other
architectures call invalidate_icache_all so rename to match.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Tom Rini <trini@konsulko.com>

As part of bringing the master branch back in to next, we need to allow
for all of these changes to exist here.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>

When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay
Ethernet"' I failed to notice that b4 noticed it was based on next and
so took that as the base commit and merged that part of next to master.

This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing
changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35.

Reported-by: Jonas Karlman <jonas@kwiboo.se>
Signed-off-by: Tom Rini <trini@konsulko.com>

This follows the example of RISC-V where <asm/global_data.h> includes
<asm/u-boot.h> directly as "gd" includes a reference to bd_info already
and so the first must include the second anyhow. We then remove
<asm/u-boot.h> from all of the places which include references to "gd"
an so have <asm/global_data.h> already.

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