Merge branch 'for-next/arm'

Release v2018.04.0 ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: zbarebox: Fix linking with new ld ...

Based on "333ff7b1e Fix linking with new ld, based on u-boot" Fix
building for the single PBL case aswell.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

Documentation: framebuffer: update documentation to current state ...

Framebuffer console support was added in 2015.

Reported-by: TobSnyder at #barebox irc
Signed-off-by: Oleksij Rempel <linux@rempel-privat.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: Make early MMU support work ...

Until now it was not possible to enable the MMU in PBL because
create_section needs memory allocations which are not available. With
this patch we move the early MMU support to a separate file and all
necessary aux functions to mmu_64.h. create_sections is reimplmented
for the early case to only create 1st level pagetables.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: change mmu_early_enable() prototype ...

Change the arguements to type unsigned long which is suitable for both
arm32 and arm64. While at it move the prototype to arch/arm/include/.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: create separate mmu_64.h file ...

cpu/mmu.h has nothing in common for the 32bit and 64bit variant. Make it
two separate files.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: Create own cache.c file for aarch64 ...

cache.c does not work properly for aarch64. We create a struct cache_fns
using C preprocessor foo which assumes the existence of cache
maintenance operations with a certain name. These functions have other
names on aarch64. While we could fix this we do not need the automatic
cache function selection on aarch64 since here we only have one function
set.
Create a separate file and be done with this issue.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: build: Remove duplicate file compilation ...

cache.o is already obj-y, drop unnecessary obj-$(CONFIG_MMU)

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: cache-armv4: Fix wrong section ...

The v4_mmu_cache_on function should be in a section with the same name.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: Add support to start kernel and barebox ...

aarch64 has its own image format. Add a bootm handler to handle this
format. Also add a barebox handler.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: disable 32bit boot commands ...

The 32bit boot support is full of legacy cruft. While it should be
possible to merge the aarch64 support there, a fresh start looks more
promising.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

bootm: provide handlers the start of the OS image ...

The bootm code needs to read the beginning of the OS image in order to
determine the filetype. If it does so already, then we can provide the
handlers the buffer. This can help the handlers to find some image
metadata before loading the full image.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

common: Add functions to find free RAM ...

The bootm code needs to put the Kernel image and initrd into free
RAM. Add some functions to find free RAM chunks to help this code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

filetype: Detect ARM aarch64 Linux images ...

ARM aarch64 Linux image have a special type. Allow to detect them.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: Add barebox head support ...

Allow aarch64 images to use the same image header as arm32 images.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

of: partition: fix typo when writing #address-cells ...

On > 4 GiB eMMC devices, barebox writes a 32-bit address and a 64-bit
size into the partition reg property, because #address-cells is
accidentally written as '#addres-cells'. This causes a fallback to
32-bit address size. Fix the typo and thereby of_partition_fixup for
64-bit partitions.

Fixes: a2fa18f9f483 ("mtd: of: Make used partition binding configurable")
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

dt-bindings: Drop unused files ...

include/dt-bindings is not included in device tree builds anymore since
2014. Since then this directory is unused, so remove the files in it.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: implement ignoring data aborts ...

Data aborts can be masked using the data_abort_mask() function.
Add the missing pieces for functionality on aarch64 so that the
'md' command is safe to call even with faulting addresses.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: print more information on sync exception ...

On a sync exception more useful information can be printed than we
currently do. Pass the ESR and FAR value to do_sync and print the
reason for the exception along with the address that actually faulted.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: Add esr strings ...

The Exception Syndrome Register (ESR) holds information over an
exception. This adds the strings necessary to dispatch this information.
Based on Linux code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: Allow to leave exceptions ...

So far exceptions can only be entered but never left. Add code to leave
exceptions based on U-Boot commit 4c2cc7c4e (arm64: Allow exceptions to return).
This will be useful to implement ignoring data aborts on a 'md' command.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: mmu: Make zero page faulting ...

Make zero page faulting which allows us to catch NULL pointer derefs.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: implement stacktraces ...

Implement stacktraces as a great debugging aid. On aarch64 this is cheap
enough to be enabled unconditionally. Unwinding code is taken from the
Kernel.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: implement show_regs() ...

Do something useful in an exception and at least print the current
register contents.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: hide some config options ...

EABI and ATAGS have no meaning on aarch64, so hide the options from the
user.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: remove dead code in linker script ...

CONFIG_ARM_UNWIND does not exist for aarch64. Remove the dead code.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: lowlevel: Use switch_el ...

Use switch_el macro rather than open coded version. While at it rename the
labels so that the name matches the exception level.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: Setup exception vectors in initcall ...

The vectors are currently configured in arm_cpu_lowlevel_init(). This
shall be callable from PBL, but here the vectors are not available so
calling it from PBL will result in a linker error.
Move the vector setup to an initcall.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM: aarch64: fix exception level mixup ...

When entering an exception the we currently jump to the code handling
EL1 when we are actually at EL3 and the other way round. Fix this by
introducing and using the switch_el macro from U-Boot.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>