ARM: Add relocatable binary support ...

For making the same binary executable on different SoCs which have
different DRAM addresses we have to be independent of the compile
time link address.

This patch adds relocatable binary support for the ARM architecture.
With this two new functions are available. relocate_to_current_adr
will fixup the binary to continue executing from the current position.
relocate_to_adr will copy the binary to a given address, fixup the
binary and continue executing from there.

For the PBL and the real image relocatable support can be enabled
independently. This is done to (hopefully) better cope with setups
where the PBL runs from SRAM or ROM and the real binary does not.

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

ARM: Automatically determine malloc size ...

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

ARM: Enable mmu early ...

This optionally enabled the MMU in the PBL or during early startup for
the non PBL case. The regular MMU init code will pickup the already enabled
MMU later. This might complicate debugging early code, so this has been
made optional.

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

ARM: Setup stack at end of SDRAM ...

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

ARM start: pickup parameters from pbl ...

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

ARM: remove now unused MACH_[HAS|DO]_LOWLEVEL_INIT ...

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

ARM: add __noreturn to board_init_lowlevel_return ...

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

ARM: Add new entry point for barebox ...

Memory is a precious resource, so it makes sense to make it available as
early as possible. By definition the lowlevel init code already knows where
to find memory because it's the lowlevel init code which sets up the memory.
Until all boards are converted this new entry is just a fallback to the old
entry point.

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

Merge branch 'for-next/arm-start' into for-next/arm

ARM: introduce arm_setup_stack function and use it ...

We have enough places which setup0 a stack to justify
a static inline function for it.

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

ARM: simplify start.c ...

start() for the PBL case is a duplicate of board_init_lowlevel_return().
Instead of duplicating it just call it.

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

ARM: add assembly function for setting up C environment ...

Sometimes Assembler beats C. In this case a small assembler
function called without parameters can:

- copy a binary to its link address
- clear the bss
- return to the same position in the copied binary

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

Merge branch 'for-next/arm-board-reset' ...

Conflicts:
	arch/arm/cpu/start-reset.c
	arch/arm/include/asm/barebox-arm.h
	arch/arm/mach-omap/Kconfig
	arch/arm/mach-omap/omap3_core.S

Merge branch 'for-next/remove-fsf-address' ...

Conflicts:
	drivers/net/miidev.c
	include/miidev.h

ARM: give boards control of the reset entry point ...

On some SoCs (for example AM35xx), the ROM bootloader passes useful
information in r0 when jumping to barebox.

To avoid overwriting this in the generic reset code, we introduce
common_reset as a C function and as an assembler macro. This is then
called form the reset entry point (either in common or in board code).

This patch is based on code by Sascha Hauer <s.hauer@pengutronix.de>.

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

Treewide: remove address of the Free Software Foundation ...

The FSF address has changed in the past. Instead of updating it
each time the address changes, just drop it completely treewide.

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

ARM lowlevel: Use get_runtime_offset ...

The current approach to get the offset between link and runtime address
is fragile. It requires a big fat comment to put no code above it and it
requires an extra linker section. Instead use a small assembler function.

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

ARM lowlevel: Update function documentation ...

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

create a common ARM flush_icache function ...

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

Add pre-bootloader (pbl) image support ...

This allows for creating a pre-bootloader binary for
 - nand boot
 - mmc boot
 - compressed image

The pbl will be incharge of the lowlevel init if needed.
The barebox will skip it.

Import string functions from linux 3.4 (arch/arm/boot/compressed/string.c) and
implement a dummy panic.

For now on introduce dummy zbarebox* targets and c code that will contain later
the decompressor. This only implemeted on ARM.

This patch is based on Sascha Hauer <s.hauer@pengutronix.de>
Add compressed image support patch

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>

ARM: move exception vector table to exceptions.S ...

start.c has nothing to do with the exception vector table anymore,
so move it next to the exception handling code in exceptions.S

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

ARM startup: calculate offset instead of runtime address ...

Calculating the offset between runtime and linked address makes the
intention of the binary copy function a bit more clear.

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

ARM: Enable unaligned accesses on armv6 and later ...

We have the following in the tree:

|commit af42feb
|Author: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
|Date:   Mon Jan 2 11:49:17 2012 +0100
|
|    ARM: set SCTRL[A] only when architecture does not support unaligned access
|
|    Recent gcc generates code with unaligned access when architecture
|    supports it. Setting A bit unconditionally causes data-aborts on such
|    code rendering barebox unusable.
|
|    Signed-off-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
|    Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

What the patch tried is correct: We should set the A bit only when the architecture
does not support unaligned accesses. To figure out whether the architecture supports
unaligned accesses the patch tested for the U bit which is wrong. The U bit may be
0 after a reset, so instead of testing for the U bit we have to set it. This can
be done on armv6 and later. All others have the A bit set to trap unaligned accesses.

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

Merge branch 'pu/cache' into next

ARM startup: Do call __mmu_cache_flush during startup ...

Traditionally we call __mmu_cache_flush in early startup. There
is a problem with armv7 and hierarchical caches though, on these
systems __mmu_cache_flush uses the stack. Appearantly this was
seldomly a problem, because most of these systems have a ROM
bootloader which sets up some stack, but on a special i.MX6 system
this failed badly. We should not have to flush caches here. Every
sane system should pass control to the bootloader without stale
entries in the caches *), so it should be a safe assumption that the
cache flush can be removed.

Since __mmu_cache_flush is not called from early code anymore we can
also move it to the regular text section.

Be brave and give it a try.

*) omap3 seems to be a exception to this, but this has a cache flush
in arch_init_lowlevel already

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

fix typo funtion -> function ...

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

ARM startup: invalidate I-cache before jumping to relocated binary ...

barebox can startup with I-cache enabled, so to be on the safe
side we should invalidate the I-cache before jumping to a binary
we just copied in place.

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

ARM: use unconditional branch in exception vectors ...

If we want to trap the processer in the exception vectors
we have to use unconditional branch instructions. I don't
know what I thought when using bne :-/

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

ARM: Allow to compile in thumb-2 mode ...

This shrinks the resulting binary size by ~25%. Exceptions
are still handled in arm mode, so we have to explicitely
put .arm directives into the exception code. Thumb-2 mode
has been tested on i.MX51 Babbage board.

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

ARM: get runtime offset of board_init_lowlevel_return by using separate section ...

We used to get the runtime offset of the board_init_lowlevel_return
by doing a &board_init_lowlevel_return. This does not work in thumb-2
mode, so use a separate linker section for this function instead.

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