At present 64-bit sunxi boards use the Makefile to create a FIT, using
USE_SPL_FIT_GENERATOR. This is deprecated.
Update sunxi to use binman instead.
Signed-off-by: Simon Glass <sjg@chromium.org>
Tested-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Introduce CONFIG_XEN to make U-Boot could be used as bootloader
for a virtual machine.
Without bootloader, we could successfully boot up android on XEN, but
we need need bootloader to support A/B, dm verify and etc.
Signed-off-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Signed-off-by: Anastasiia Lukianenko <anastasiia_lukianenko@epam.com>
Remove ad-hoc CONFIG_SYS_SRAM_START and use CONFIG_SYS_SRAM_BASE instead.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
This converts ad-hoc CONFIG_SYS_SRAM_SIZE to Kconfig.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
This converts ad-hoc CONFIG_SYS_SRAM_BASE to Kconfig.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
In order to be able to replace "#ifdef CONFIG_SYS_SRAM_BASE" sequences
with the IS_ENABLED() equivalent, introduce a new boolean Kconfig option
that signals whether the platform has SRAM support.
Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Ovidiu Panait <ovidiu.panait@windriver.com>
The Kconfig symbol CONFIG_STACK_SIZE is used both by ARM and Microblaze
with the same meaning. Move it to menu 'General setup' so that we can use
it for all architectures.
Use the value of CONFIG_STACK_SIZE instead of a hard coded 16 MiB value for
reserving memory in the UEFI sub-system.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
At present this board uses a custom script to produce the .its file.
Update it to use binman instead. Binman can create all the images that
are needed.
Signed-off-by: Simon Glass <sjg@chromium.org>
At present we use the empty string to indicate that there is no FIT
generator, but this doesn't allow an individual board to undefine it.
Create a separate bool instead.
Update the config of the boards which currently have an empty string.
Signed-off-by: Simon Glass <sjg@chromium.org>
This Kconfig is not needed anymore since U-Boot will build the ROM if the
required binary blobs exist.
The BUILD_ROM environment variable used to request that the ROM be built.
Now this always happens if the required binary blobs are available. Update
it to mean that U-Boot should fail if the ROM cannot be built. This
behaviour should be compatible with how it used to work.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Most x86 boards build a u-boot.rom which is programmed into SPI flash. But
this is not unique to x86. For example some rockchip boards can also boot
from SPI flash.
Also, at least on x86, binary blobs are sadly quite common. It is not
possible to build a functional image without them, and U-Boot needs to
know this at build time.
Introduce a new CONFIG_HAS_ROM option which selects whether u-boot.rom is
built and a new CONFIG_ROM_NEEDS_BLOBS option to indicate whether binary
blobs are also needed. If they are not needed, it is safe to build the ROM
always. Otherwise we still require the BUILD_ROM environment variable.
For now this affects only x86, but future patches will enable this for
rockchip too.
Signed-off-by: Simon Glass <sjg@chromium.org>
Verifying FIT images obviously needs the rsa parts of crypto
support and while main uboot always compiles crypto support,
it's optional for SPL and we should thus select the necessary
option to not end up in compile errors like:
u-boot/lib/rsa/rsa-verify.c:328: undefined reference to `rsa_mod_exp'
So select SPL_CRYPTO_SUPPORT in SPL_FIT_SIGNATURE.
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
rsa-checsum needs support for hash functions or else will run into
compile errors like:
u-boot/lib/rsa/rsa-checksum.c:28: undefined reference to `hash_progressive_lookup_algo'
So similar to the main FIT_SIGNATURE entry selects HASH,
select SPL_HASH_SUPPORT for SPL_FIT_SIGNATURE.
Cc: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This is a side-port of commit 21c54b774744 ("kconfig: show compiler
version text in the top comment") from Linux:
"The kernel configuration phase is now tightly coupled with the compiler
in use. It will be nice to show the compiler information in Kconfig."
We have already had the required makefile logic for this and had not
included printing the value in various user and file visible places.
Cc: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
There are cases where when we allow the compiler to decide about making
inline decisions rather than forcing them it can save us space.
For now, we keep the default values for inlining that we have had
historically.
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
In the Linux kernel, support for forcing inline functions to be made
inline, rather than allowing the compiler to make its own choice has
been removed. With respect to performance, modern GCC (and Clang) do a
good job at deciding when to, or not to, inline code and there are no
run-time requirements in Linux anymore.
There is one downside to this, which is final binary size. On average
in U-Boot removing this support grows SPL by almost 1 kilobyte. But
there are cases where it shrinks the binary by making better inline
choices than we had forced.
Start by re-introducing CONFIG_OPTIMIZE_INLINING as a global which
essentially reverts 889b3c1245de ("compiler: remove CONFIG_OPTIMIZE_INLINING entirely")
from Linux.
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Copy these from Linux v5.7-rc5 tag.
This brings in some handy new attributes and is otherwise important to
keep in sync.
We drop the reference to smp_read_barrier_depends() as it is not
relevant on the architectures we support at this time, based on where
it's implemented in Linux today. We drop the call to kasan_check_read()
as that is not relevant to U-Boot as well.
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
As part of re-syncing our Kconfig logic up to v4.19, we had missed
adding this new file that includes helper macros. To quote the upstream
commit e1cfdc0e72fc ("kconfig: add basic helper macros to scripts/Kconfig.include"):
Kconfig got text processing tools like we see in Make. Add Kconfig
helper macros to scripts/Kconfig.include like we collect Makefile
macros in scripts/Kbuild.include.
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Several configutation options require additional memory before relocation:
* CONSOLE_RECORD
* LOG
* RSA
The current default of 0x400 is too small to encompass them all. Increase
the value of SYS_MALLOC_F_LEN to 0x2000 for ARCH_QEMU.
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
The current recommendation for best security practice from the US government
is to use SHA384 for TOP SECRET [1].
This patch adds support for SHA384 and SHA512 in the hash command, and also
allows FIT images to be hashed with these algorithms, and signed with
sha384,rsaXXXX and sha512,rsaXXXX
The SHA implementation is adapted from the linux kernel implementation.
[1] Commercial National Security Algorithm Suite
http://www.iad.gov/iad/programs/iad-initiatives/cnsa-suite.cfm
Signed-off-by: Reuben Dowle <reuben.dowle@4rf.com>
Have this symbol follow the pattern of all other such symbols.
This patch also removes a TODO from the code.
Reviewed-by: Chris Packham <judge.packham@gmail.com>
Signed-off-by: Trevor Woerner <twoerner@gmail.com>
Malloc gets initialized with a call to mem_malloc_init() with the address
the allocation starts to and its size. Currently it is not possible to
move the malloc from one memory area to another as the malloc would eventually
fail.
This patch adds in the ability to re-init the malloc with the updated
start address and the size.
One of the use cases of this feature is SPL U-Boot running from within
the static memory and calling to malloc init from within board_init_f():
arch/arm/cpu/armv8/start.S:reset vector
arch/arm/cpu/armv8/start.S:main()
arch/arm/lib/crt0_64.S:board_init_f()
board/<my_board>/common/spl.c:board_init_f()
board/<my_board>/common/spl.c:mem_malloc_init((ulong)CONFIG_SYS_SPL_MALLOC_START,
CONFIG_SYS_SPL_MALLOC_SIZE);
Shortly after the DDR (main) memory is init and ready we call to malloc init
again but this time with the start address in the DDR memory and a much greater
size for moving the allocation off the static to the DDR memory:
board/<my_board>/common/spl.c:mem_malloc_init((ulong)CONFIG_SPL_MALLOC_OFFSET,
CONFIG_SPL_MALLOC_SIZE);
Where CONFIG_SYS_SPL_MALLOC_START and CONFIG_SPL_MALLOC_OFFSET are the start
addresses of the malloc in the static and DDR memories respectively and
CONFIG_SYS_SPL_MALLOC_SIZE=SZ_16K and CONFIG_SPL_MALLOC_SIZE=SZ_2M are
the sizes of the mallocs in these memories. Note, now we have a much greater
memory, enlarging from 16K to 2M, available for allocation.
There is an alternative approach already existing in U-Boot with the use of
an early (simplified) malloc and the proper (dlamalloc) malloc however
necessitating managing the two mallocs whereas this approach proposes using
a single dlmalloc.
Signed-off-by: Marek Bykowski <marek.bykowski@gmail.com>
This patch moves some of the config options from bubblegum_96_defconfig
to respective Kconfig files.
Signed-off-by: Amit Singh Tomar <amittomer25@gmail.com>
Do not build image_sign_info helper functions in SPL if not needed.
Fixes: b983cc2da0 ("lib: rsa: decouple rsa from FIT image verification")
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Reviewed-by: Tom Rini <trini@konsulko.com>
Update reference in Kconfig detected by
scripts/documentation-file-ref-check
README.x86 => doc/arch/x86.rst
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Commit f4dc714aaa ("arm64: Turn u-boot.bin back into an ELF file after
relocate-rela")
introduce REMAKE_ELF option to recreate u-boot.elf from u-boot ->
u-boot.bin + DT -> u-boot.elf.
The best is to ilustrate it from make V=1 output
cat u-boot-nodtb.bin dts/dt.dtb > u-boot-dtb.bin
cp u-boot-dtb.bin u-boot.bin
aarch64-linux-gnu-objcopy -I binary -B aarch64 -O elf64-littleaarch64 u-boot.bin u-boot-elf.o
aarch64-linux-gnu-ld.bfd u-boot-elf.o -o u-boot.elf --defsym="_start"=0x8000000 -Ttext=0x8000000
Last command has no explicit linker script passed that's why toolchain
internal linker script is used.
In Binutils 2.32 case it contains SIZEOF_HEADERS symbol which has changed
behavior by commit
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=64029e93683a266c38d19789e780f3748bd6a188
which result in situation that program headers has changed from
(xilinx_zynqmp_mini_defconfig)
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000010000 0x00000000fffc0000 0x00000000fffc0000
0x0000000000018918 0x0000000000018918 RW 0x10000
to
Program Headers:
Type Offset VirtAddr PhysAddr
FileSiz MemSiz Flags Align
LOAD 0x0000000000000000 0x00000000fffb0000 0x00000000fffb0000
0x0000000000028918 0x0000000000028918 RW 0x10000
Xilinx tools like XSDB or Bootgen are using program headers for loading ELF
to the right location and by above binutils change ELF is loaded to
incorrect location.
The patch is explicitly use u-boot-elf.lds (just cat now) for u-boot.elf
recreation which is called when REMAKE_ELF is setup.
By purpose u-boot-elf.lds doesn't contain OUTPUT_FORMAT/OUTPUT_ARCH to be
able to use by all archs.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Tested-By: Álvaro Fernández Rojas <noltari@gmail.com>
Some config symbols are found in *almost* every _defconfig file for
Allwinner boards, because those options are actually a platform choice,
and not a per-board decision.
Some of these options are older, some have recently been added.
Move those options to be set for all Allwinner boards in their
respective Kconfig files.
The rationales are as follows:
- NR_DRAM_BANKS: All Allwinner SoC map DRAM at one contiguous region of
address space only, starting at 1 GB. So it's always one bank.
- SPL_{DOS,EFI}_PARTITION: The Allwinner SPL does only support raw MMC
accesses, we don't care about filesystems or partitions in there, so
there is no need to define those symbols at all.
- USE_PREBOOT: We start USB early when a keyboard is configured, using the
preboot env variable, so we need to set this variable.
- SYS_RELOC_GD_ENV_ADDR: We don't specify any ENV_ADDR, so need this
symbol to be set (according to 8d8ee47e03).
- SYS_USB_EVENT_POLL_VIA_INT_QUEUE: According to commit eab9433aa5,
specifying this reduces the latency of the USB keyboard handling, so
this was formerly enabled in config headers for all Allwinner boards.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # Amarula A64-Relic
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
Align Kconfig and Kbuild logic to Linux 4.18 release with minimal impact
on files outside of this scope.
Our previous Kconfig sync was done by commit e91610da7c ("kconfig:
re-sync with Linux 4.17-rc4").
A very small number of changes upstream since our sync with v4.17-rc4
that exist in the v4.18 release have already been applied here and have
been omitted from the list in this commit (and are readily available in
our own git history).
The imported Linux commits are:
[From prior to v4.17-rc4]
39a33ff80a25 kbuild: remove cc-option-align
db547ef19064 Kbuild: don't add obj tree in additional includes
b999596b963a Kbuild: don't add ../../ to include path
[From v4.17 to v4.18]
b3aa58d2e85d fixdep: suppress consecutive / from file paths in dependency list files
74656b682902 kbuild: disable new dtc graph and unit-address warnings
74d931716151 genksyms: remove symbol prefix support
e6ecfb45072c kbuild: do not display CHK for filechk
0b669a5076fd kconfig: refactor Qt package checks for building qconf
b464ef583dc7 kconfig: refactor GTK+ package checks for building gconf
1c5af5cf9308 kconfig: refactor ncurses package checks for building mconf and nconf
694c49a7c01c kconfig: drop localization support
96f60dfa5819 trace: Use -mcount-record for dynamic ftrace
bb222ceeb327 kconfig: remove string expansion in file_lookup()
96d8e48da55a kconfig: remove string expansion for mainmenu after yyparse()
5b31a9746756 kconfig: remove sym_expand_string_value()
137c0118a900 kconfig: make default prompt of mainmenu less specific
e298f3b49def kconfig: add built-in function support
2fd5b09c201e kconfig: add 'shell' built-in function
9de071536c87 kconfig: begin PARAM state only when seeing a command keyword
9ced3bddec08 kconfig: support user-defined function and recursively expanded variable
1175c02506ff kconfig: support simply expanded variable
ed2a22f277c6 kconfig: support append assignment operator
82bc8bd82e5c kconfig: expand lefthand side of assignment statement
1d6272e6fe43 kconfig: add 'info', 'warning-if', and 'error-if' built-in functions
a702a6176e2f kconfig: add 'filename' and 'lineno' built-in variables
915f64901eb3 kconfig: error out if a recursive variable references itself
2bece88f89fa kconfig: test: add Kconfig macro language tests
21c54b774744 kconfig: show compiler version text in the top comment
59f7b5847b0c kbuild: $(CHECK) doesnt need NOSTDINC_FLAGS twice
145167650b96 kbuild: add endianness flag to CHEKCFLAGS
1f2f01b122d7 kbuild: add machine size to CHECKFLAGS
d6a0c8a1326b kconfig: Add testconfig into make help output
bb6d83dde191 kbuild: Move last word of nconfig help to the previous line
8593080c0fcf kconfig: fix localmodconfig
ed7d40bc67b8 tracing: Fix SKIP_STACK_VALIDATION=1 build due to bad merge with -mrecord-mcount
b2d00d7c61c8 kconfig: fix line numbers for if-entries in menu tree
ecd53ac2f2c6 kconfig: handle P_SYMBOL in print_symbol()
73d1c580f92b kconfig: loop boundary condition fix
48f6e3cf5bc6 kbuild: do not drop -I without parameter
bd412d81b7ea kbuild: .PHONY is not a variable, but PHONY is
6916162c7308 kbuild: remove duplicated comments about PHONY
Cc: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Masahiro Yamada <masahiroy@kernel.org>
Introduce new configuration, CONFIG_RSA_VERIFY which will decouple building
RSA functions from FIT verification and allow for adding a RSA-based
signature verification for other file formats, in particular PE file
for UEFI secure boot.
Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
The default value of CONFIG_SYS_MALLOC_F_LEN (0x400)
leaves U-Boot with not enough memory to load i2c driver
before relocate, causing it to hang.
Change the default value of CONFIG_SYS_MALLOC_F_LEN
for below SoCs,
- LS1012A
- LS1021A
- LS1043A
- LS1046A
Signed-off-by: Biwen Li <biwen.li@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit add the support of encrypting image with aes
in mkimage. To enable the ciphering, a node cipher with
a reference to a key and IV (Initialization Vector) must
be added to the its file. Then mkimage add the encrypted
image to the FIT and add the key and IV to the u-boot
device tree.
Signed-off-by: Philippe Reynes <philippe.reynes@softathome.com>
Follow i.MX, Sunxi, RISC-V and Rockchip to generate u-boot.itb which
includes U-Boot proper, ATF and DTBs in FIT format. ZynqMP supports FIT for
quite a long time but with using out of tree solution. The patch is filling
this gap.
Tested on zcu102, zcu104 and zcu100/Ultra96.
zcu100/Ultra96 v2.2 ATF build by:
make DEBUG=0 ZYNQMP_CONSOLE=cadence1 RESET_TO_BL31=1 PLAT=zynqmp bl31
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
If the node describing an overlay does not specify a load address, it will
be loaded at the address previously used.
Fixing it by allocating a temporary buffer that will be used as a
default load address. By default, the size of the buffer is 64kB which
should be plenty for most use cases.
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
doc/uImage.FIT/overlay-fdt-boot.txt is describing how to create FIT
image with DT overlays in it.
Add support for this feature to SPL.
Here is the ZynqMP fragment where dtb points to full DT and dtbo is
overlay which should be applied on the top of dtb.
config {
description = "ATF with full u-boot overlay";
firmware = "atf";
loadables = "uboot";
fdt = "dtb", "dtbo";
};
The whole feature depends on OF_LIBFDT_OVERLAY which is adding +4kB code
and 0 for platforms which are not enabling this feature.
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
The existing work-around for positioning U-Boot in the ROM when it
actually runs from RAM still exists and there is not obvious way to change
this.
Add a proper Kconfig option to handle this case. This also adds a new bool
property to indicate whether CONFIG_SYS_TEXT_BASE exists.
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Extract all sysboot command related code from pxe.c to new sysboot.c
Update Kconfig to insure that DISTRO_DEFAULT select new CMD_SYSBOOT
command.
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
For all the Rockchip SoCs with SPL_LOAD_FIT enable, we need to build
u-boot.itb with U-Boot proper and ATF/OPTEE.
All the Rockchip boards with SPL_LOAD_FIT now supports FIT generator to
get ATF/OPTEE binary path from environment and pass the build even if no
ATF/OPTEE binary exist, so we can enable this feature for the rockchip
platform.
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
Some U-Boot pointers have redundant information, so we can use a scheme
where we can return either an error code or a pointer with the same
return value. The default implementation just casts the pointer to a
number, however, this may fail on platforms where the end of the address
range is used for valid pointers (e.g. 0xffffff00 is a valid heap pointer
in socfpga SPL). For such platforms, this value provides an upper range
of those error pointer values - up to 'MAX_ERRNO' bytes below this value
must be unused/invalid addresses.
Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Use BUILD_TARGET to automatically build "u-boot-with-spl.imx" on MX6
targets with SPL.
Signed-off-by: Stefan Roese <sr@denx.de>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Stefano Babic <sbabic@denx.de>
Now that we have a generic FIT generator script for RISC-V, set it as
the default. To also build the FIT image by default, set the default
build target to "u-boot.itb" if CONFIG_SPL_LOAD_FIT is enabled.
Signed-off-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
- remove rk3288 fennec board
- remove SPL raw image support for Rockchip SoCs
- add common misc_init_r() for ethaddr from cpuid
- enable USB HOST support for rk3328
- unify code for finding a valid gpt in part driver
Several options are presenting themselves on a various boards
where the options are clearly not used. (ie, arm64 options on
arm9, or SPL/TPL options when SPL or TPL are not defined)
This patch is not attempting to be a complete list of items, but
more like low hanging fruit.
This patch attempts to reduce some of the menuconfig noise
by defining dependencies so they don't appear when not used.
Signed-off-by: Adam Ford <aford173@gmail.com>
The name CONFIG_LEGACY_IMAGE_FORMAT reads slightly better along with
allowing us to avoid a rather nasty Kbuild/Kconfig issue down the line
with CONFIG_IS_ENABLED(IMAGE_FORMAT_LEGACY). In a few places outside of
cmd/ switch to using CONFIG_IS_ENABLED() to test what is set.
Signed-off-by: Tom Rini <trini@konsulko.com>
Add u-boot.itb BUILD_TARGET for Rockchip platform when SPL_LOAD_FIT
is being used.
This can get rid of building itb explicitly with 'make u-boot.itb'
so, from now all required images will build just by make.
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
In order to migrate this symbol to Kconfig introduce a new symbol to
guard it, CONFIG_SYS_CUSTOM_LDSCRIPT. When that is set we can then
provide the exact final location o the script.
Signed-off-by: Tom Rini <trini@konsulko.com>
