doc: Update Linux build page

Signed-off-by: Dmitrii Burnaev <Dmitrii.Burnaev@synopsys>

Author: Dmitrii Burnaev

doc/linux/kernel-build.rst

@@ -10,7 +10,7 @@ single question "How to confirm, that I can build Linux kernel with *that*
 toolchain?"
 
 To learn how to configure Linux, debug kernel itself and build extra software
-please see `<https://github.com/foss-for-synopsys-dwc-arc-processors/linux/wiki>`.
+please see `https://github.com/foss-for-synopsys-dwc-arc-processors/linux/wiki`.
 
 
 Prerequisites
@@ -58,7 +58,7 @@ Synopsys will be used.
 Configuring
 -----------
 
-Check `Buildroot downloads page <http://buildroot.org/download.html>` for
+Check `Buildroot downloads page <http://buildroot.org/download.html>`_ for
 latest release. This guide further assumes latest snapshot. Get Buildroot
 sources::
 
@@ -81,6 +81,7 @@ Contents of this file should be following::
     BR2_TOOLCHAIN_EXTERNAL_GCC_6=y
     BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_8=y
     BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
+    BR2_TOOLCHAIN_EXTERNAL_HAS_SSP=y
     BR2_TOOLCHAIN_EXTERNAL_INET_RPC=y
     BR2_TOOLCHAIN_EXTERNAL_CXX=y
     BR2_LINUX_KERNEL=y
@@ -115,10 +116,13 @@ Building
 To build Linux kernel image using that defconfig::
 
     $ cd buildroot
-    $ make O=../output_hs defconfig DEFCONFIG=../hs_defconfig
+    $ make O=`readlink -e ../output_hs` defconfig DEFCONFIG=`readlink -e ../hs_defconfig`
     $ cd ../output_hs
     $ make
 
+It's necessary to pass an absolute path to Buildroot, because there is the issue
+with a relative path.
+
 After that there will be Linux kernel image file
 ``arc-2017.03-linux-guide/output/images/vmlinux``.
 
@@ -234,6 +238,7 @@ With those changes Buildroot defconfig for ARC HS VDK is::
     BR2_TOOLCHAIN_EXTERNAL_GCC_6=y
     BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_8=y
     BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
+    BR2_TOOLCHAIN_EXTERNAL_HAS_SSP=y
     BR2_TOOLCHAIN_EXTERNAL_INET_RPC=y
     BR2_TOOLCHAIN_EXTERNAL_CXX=y
     BR2_LINUX_KERNEL=y
@@ -249,7 +254,7 @@ Save this defconfig to some file (for example ``vdk_defconfig``). Then use same
 process as in :ref:`linux-building-label` section.::
 
     $ cd buildroot
-    $ make O=../output_vdk defconfig DEFCONFIG=<path-to-VDK-defconfig-file>
+    $ make O=`readlink -e ../output_vdk` defconfig DEFCONFIG=<path-to-VDK-defconfig-file>
     $ cd ../output_vdk
     $ make
 
@@ -335,5 +340,5 @@ defconfig is::
 
 This defconfig will create a uImage file instead of vmlinux. Please refer to
 `ARC Linux wiki
-<https://github.com/foss-for-synopsys-dwc-arc-processors/linux/wiki/Getting-Started-with-Linux-on-ARC-AXS103-Software-Development-Platform-(SDP)>`
+<https://github.com/foss-for-synopsys-dwc-arc-processors/linux/wiki/Getting-Started-with-Linux-on-ARC-AXS103-Software-Development-Platform-(SDP)>`_
 for more details on using u-boot with AXS103.