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docs: linux/kernel-build: Update for arc-2020.09
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* Updated reference to pre-built arc-2020.09 toolchain tarballs
* Updated reference to buildroot-2020.8.1 tarball
* Updated Buildroot configuration to match pre-built tools:
   * GCC version bumped to v10
   * Linux headers bumped to v5.7
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@vkremneva @abrodkin
vkremneva authored and abrodkin committed Oct 15, 2020
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37 changes: 19 additions & 18 deletions doc/linux/kernel-build.rst
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Expand Up @@ -62,30 +62,30 @@ Check `Buildroot downloads page <http://buildroot.org/download.html>`_ for
latest release. This guide further assumes latest snapshot. Get Buildroot
sources::

$ mkdir arc-2020.03-linux-guide
$ cd arc-2020.03-linux-guide
$ wget https://buildroot.org/downloads/buildroot-2020.02.tar.bz2
$ tar xf buildroot-2020.02.tar.bz2
$ mkdir arc-2020.09-linux-guide
$ cd arc-2020.09-linux-guide
$ wget https://buildroot.org/downloads/buildroot-2020.02.7.tar.bz2
$ tar xf buildroot-2020.08.1.tar.bz2

To build Linux and rootfs Buildroot should be configured. For the purpose of
this guide, a custom "defconfig" file will be created and then will be used to
configure Buildroot. Custom "defconfig" file can be located anywhere and have
any name. For example it can be ``arc-2020.03-linux-guide/hs_defconfig``.
any name. For example it can be ``arc-2020.09-linux-guide/hs_defconfig``.
Contents of this file should be following::

BR2_arcle=y
BR2_archs38=y
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.03-rc1/arc_gnu_2020.03-rc1_prebuilt_uclibc_le_archs_linux_install.tar.gz"
BR2_TOOLCHAIN_EXTERNAL_GCC_9=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_15=y
BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.09-rc1/arc_gnu_2020.09-rc1_prebuilt_uclibc_le_archs_linux_install.tar.gz"
BR2_TOOLCHAIN_EXTERNAL_GCC_10=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_5_7=y
BR2_TOOLCHAIN_EXTERNAL_LOCALE=y
BR2_TOOLCHAIN_EXTERNAL_HAS_SSP=y
BR2_TOOLCHAIN_EXTERNAL_CXX=y
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_DEFCONFIG="nsim_hs"
BR2_LINUX_KERNEL_DEFCONFIG="haps_hs"
BR2_LINUX_KERNEL_VMLINUX=y
BR2_PACKAGE_GDB=y
BR2_PACKAGE_GDB_DEBUGGER=y
Expand All @@ -102,6 +102,7 @@ Important notes about modifying Buildroot defconfig:
=================== =======================
Toolchain version Linux headers version
=================== =======================
2020.09 5.7
2020.03 4.15
2019.09 4.15
2019.03 4.15
Expand Down Expand Up @@ -142,7 +143,7 @@ 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-2020.03-linux-guide/output/images/vmlinux``.
``arc-2020.09-linux-guide/output/images/vmlinux``.


Running on nSIM
Expand All @@ -151,7 +152,7 @@ Running on nSIM
Linux configuration in the provided Buildroot defconfig is for the standalone
nSIM. This kernel image can be run directly on nSIM, without any other
additional software. Assuming current directory is
``arc-2020.03-linux-guide``::
``arc-2020.09-linux-guide``::

$ $NSIM_HOME/bin/nsimdrv -prop=nsim_isa_family=av2hs -prop=nsim_isa_core=3 -prop=chipid=0xffff -prop=nsim_isa_atomic_option=1 -prop=nsim_isa_ll64_option=1 -prop=nsim_mmu=4 -prop=mmu_pagesize=8192 -prop=mmu_super_pagesize=2097152 -prop=mmu_stlb_entries=16 -prop=mmu_ntlb_ways=4 -prop=mmu_ntlb_sets=128 -prop=icache=32768,64,4,0 -prop=dcache=16384,64,2,0 -prop=nsim_isa_shift_option=2 -prop=nsim_isa_swap_option=1 -prop=nsim_isa_bitscan_option=1 -prop=nsim_isa_sat=1 -prop=nsim_isa_div_rem_option=1 -prop=nsim_isa_mpy_option=9 -prop=nsim_isa_enable_timer_0=1 -prop=nsim_isa_enable_timer_1=1 -prop=nsim_isa_number_of_interrupts=32 -prop=nsim_isa_number_of_external_interrupts=32 -prop=isa_counters=1 -prop=nsim_isa_pct_counters=8 -prop=nsim_isa_pct_size=48 -prop=nsim_isa_pct_interrupt=1 -prop=nsim_mem-dev=uart0,base=0xc0fc1000,irq=24 -prop=nsim_isa_aps_feature=1 -prop=nsim_isa_num_actionpoints=4 -prop=nsim_isa_rtc_option=1 output_hs/images/vmlinux

Expand Down Expand Up @@ -189,13 +190,13 @@ differences::
BR2_TOOLCHAIN_EXTERNAL=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM=y
BR2_TOOLCHAIN_EXTERNAL_DOWNLOAD=y
BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.03-rc1/arc_gnu_2020.03-rc1_prebuilt_glibc_le_archs_linux_install.tar.gz"
BR2_TOOLCHAIN_EXTERNAL_GCC_9=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_4_15=y
BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.09-rc1/arc_gnu_2020.09-rc1_prebuilt_glibc_le_archs_linux_install.tar.gz"
BR2_TOOLCHAIN_EXTERNAL_GCC_10=y
BR2_TOOLCHAIN_EXTERNAL_HEADERS_5_7=y
BR2_TOOLCHAIN_EXTERNAL_CUSTOM_GLIBC=y
BR2_TOOLCHAIN_EXTERNAL_CXX=y
BR2_LINUX_KERNEL=y
BR2_LINUX_KERNEL_DEFCONFIG="nsim_hs"
BR2_LINUX_KERNEL_DEFCONFIG="haps_hs"
BR2_LINUX_KERNEL_VMLINUX=y
BR2_PACKAGE_GDB=y
BR2_PACKAGE_GDB_DEBUGGER=y
Expand All @@ -210,10 +211,10 @@ Process of building kernel for ARC 770 is similar to what is for ARC HS. It is
required only to change several option in Buildroot defconfig:

* ``BR2_archs38=y`` with ``BR2_arc770d=y``
* ``BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.03-rc1/arc_gnu_2020.03-rc1_prebuilt_uclibc_le_archs_linux_install.tar.gz"``
* ``BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.09-rc1/arc_gnu_2020.09-rc1_prebuilt_uclibc_le_archs_linux_install.tar.gz"``
with
``BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.03-rc1/arc_gnu_2020.03-rc1_prebuilt_uclibc_le_arc700_linux_install.tar.gz"``
* ``BR2_LINUX_KERNEL_DEFCONFIG="nsim_hs"`` with
``BR2_TOOLCHAIN_EXTERNAL_URL="https://github.com/foss-for-synopsys-dwc-arc-processors/toolchain/releases/download/arc-2020.09-rc1/arc_gnu_2020.09-rc1_prebuilt_uclibc_le_arc700_linux_install.tar.gz"``
* ``BR2_LINUX_KERNEL_DEFCONFIG="haps_hs"`` with
``BR2_LINUX_KERNEL_DEFCONFIG="nsim_700"``

Then repeat steps from :ref`linux-building-label` section of this document to build
Expand Down

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