u-boot.git/arch/arc, branch v2016.11

Remove arch/${ARCH}/include/asm/errno.h

2016-09-23T21:56:18+00:00

Unlike Linux, nothing about errno.h is arch-specific in U-Boot.
As you see, all of arch/${ARCH}/include/asm/errno.h is just a
wrapper of .  Actually, U-Boot does not
export headers to user-space, so we just have to care about the
consistency in the U-Boot tree.

Now all of include directives for  are gone.
Deprecate .

Signed-off-by: Masahiro Yamada 
Acked-by: Alexey Brodkin

arc: Use -mcpu=XXX instead of obsolete -marcXXX

2016-09-16T09:12:26+00:00

With newer ARC tools old way of CPU specification gets obsolete,
so we're switching to newer and more common way of setting "-mcpu".

Signed-off-by: Alexey Brodkin

arc: Rename AXS101 board to more generic AXS10x

2016-08-05T09:50:33+00:00

As of now we have 2 flavors of ARC SDP boards:
 1) AXS101 - with ARC770 in ASIC
 2) AXS103 - with ARC HS38 in FPGA

Both options share exactly the same base-board and only differ with
CPU-tiles in use. That means all peripherals are the same (they are
implemented in FPGA on the base-board) and so generic board could be
used for both.

While at it:
 * Recreated defconfigs with savedefconfig
 * In include/configs/axs10x.h numerical sizes replaced with
defines from linux/sizes.h for better readability.

Signed-off-by: Alexey Brodkin 
Reviewed-by: Tom Rini

arc: Rename ARCangel4 board to nSIM

2016-08-05T09:50:25+00:00

ARCangel was one of the main development boards back in the day but
now it's gone and replaced by other boards like ARC SDP.

But we also used to have simulation platform very similar to ARCangel4
in terms of CPU settings as well as basic IO like UART. Even though
ARCangel4 is long gone now we have a replacement for simulation which is
a plain or stand-alone nSIM and Free nSIM.

Note Free nSIM is available for download here:
https://www.synopsys.com/cgi-bin/dwarcnsim/req1.cgi

And while at it:
 * Finally switch hex numerical values in nsim.h to defines from
   include/linux/sizes.h
 * Add defconfigs with ARC HS38 cores
 * Recreated all defconfigs with savedefconfig

Signed-off-by: Alexey Brodkin

arc: No need in sections defined in sources with newer tools

2016-08-05T09:50:25+00:00

Starting from arc-2016.03 GNU tools linker properly works with
symbols defined in linker script and so external declarations
are no longer required, dump them.

Signed-off-by: Alexey Brodkin

arc: Update exception & interrupt handling for ARCv2

2016-08-05T09:50:25+00:00

Initially IVT for ARCv2 was simply copypasted from ARCompact
with some selected fixes so basic stuff works.

Now we update it with more ARCv2 specific vectors like
 * Software Interrupt
 * Division by zero
 * Data cache consistency error
 * Misaligned access

Also normal interrupts are now implemented properly and extened to
all possible 240 items.

Signed-off-by: Alexey Brodkin

arc: Add debug messages during relocation fixups

2016-08-05T09:50:25+00:00

This might be useful to make sure relocation fixups really
happen. And since this info gets printed only in DEBUG
build it doesn't really hurt normal execution.

Signed-off-by: Alexey Brodkin

arc: make global_data.h usable in assembly files

2016-07-04T08:43:41+00:00

Currently on attempt to use global_data.h in an assembly file following
will happen:
-------------------->8-----------------
./arch/arc/include/asm/global_data.h: Assembler messages:
./arch/arc/include/asm/global_data.h:11: Error: bad instruction 'struct arch_global_data{'
./arch/arc/include/asm/global_data.h:12: Error: junk at end of line, first unrecognized character is `}'
scripts/Makefile.build:316: recipe for target 'arch/arc/lib/start.o' failed
-------------------->8-----------------

In this change we disable struct arch_global_data in ASM which fixes
the issue above.

Signed-off-by: Alexey Brodkin

arc: Use "-mcpu=archs" instead of deprecated "-marchs" for ARC HS

2016-07-04T08:43:40+00:00

Newer ARC toolchains don't support "-marchs" option any longer.
Instead "-mcpu=archs" should be used. What's also important older
toiolchains that support ARC HS cores will also happily accept
"-mcpu=archs" so that's a very safe move.

Signed-off-by: Alexey Brodkin

arc: Update data accessors with use of memory barriers

2016-06-13T12:38:05+00:00

Memory barriers are proven to be a requirement for both compiler and
real hardware to properly serialize access to critical data.

For example if CPU or data bus it uses may do reordering of data
accesses absence of memory barriers might easily lead to very subtle and
hard to debug data corruptions.

This implementation was heavily borrowed from up to date Linux kernel.

Signed-off-by: Alexey Brodkin