[Buildroot] [PATCH] board: add support for ARC AXS101 and AXS103 Software Development Platforms

[Alexey Brodkin]

The AXS10x Platform consists of a DesignWare AXC001 CPU
Card (with ARC 770D core) in case of AXS101 or AXC003 CPU Card
(typically with ARC HS38 core) in case of AXS103 mounted on an
ARC Software Development Platform Mainboard with DesignWare peripherals:
 * SD/MMC contoller
 * Gigabit network contoller
 * Serial ports (8250-compatible)
 * USB 2.0
 * SPI
 * I2C

It also houses HDMI output for external monitor connection.

For stand-alone usage of the board (with only keyboard, mouse and montor
attached) kernel console and getty made available on tty0 as well as on
serial port (ttyS3).

Note there're 2 prerequisites:
 [1] u-boot: 2015.07 - fix creation of .config
     http://patchwork.ozlabs.org/patch/502558/

 [2] binutils: fix buildng of Linux kernel for ARCv2 ISA
     http://patchwork.ozlabs.org/patch/503550/

Signed-off-by: Alexey Brodkin <abrodkin at synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
---
 board/synopsys/axs10x/fs-overlay/etc/inittab | 41 ++++++++++++++++++++++++++++
 configs/snps_axs101_defconfig                | 13 +++++++++
 configs/snps_axs103_defconfig                | 14 ++++++++++
 3 files changed, 68 insertions(+)
 create mode 100644 board/synopsys/axs10x/fs-overlay/etc/inittab
 create mode 100644 configs/snps_axs101_defconfig
 create mode 100644 configs/snps_axs103_defconfig

diff --git a/board/synopsys/axs10x/fs-overlay/etc/inittab b/board/synopsys/axs10x/fs-overlay/etc/inittab
new file mode 100644
index 0000000..de3d6e8
--- /dev/null
+++ b/board/synopsys/axs10x/fs-overlay/etc/inittab
@@ -0,0 +1,41 @@
+# /etc/inittab
+#
+# Copyright (C) 2001 Erik Andersen <andersen at codepoet.org>
+#
+# Note: BusyBox init doesn't support runlevels.  The runlevels field is
+# completely ignored by BusyBox init. If you want runlevels, use
+# sysvinit.
+#
+# Format for each entry: <id>:<runlevels>:<action>:<process>
+#
+# id        == tty to run on, or empty for /dev/console
+# runlevels == ignored
+# action    == one of sysinit, respawn, askfirst, wait, and once
+# process   == program to run
+
+# Startup the system
+null::sysinit:/bin/mount -t proc proc /proc
+null::sysinit:/bin/mkdir -p /dev/pts
+null::sysinit:/bin/mkdir -p /dev/shm
+null::sysinit:/bin/mount -a
+null::sysinit:/bin/hostname -F /etc/hostname
+# now run any rc scripts
+::sysinit:/etc/init.d/rcS
+
+# Start an "askfirst" shell on the console (whatever that may be)
+#::askfirst:-/bin/sh # ASKFIRST_SHELL
+
+# /sbin/getty invocations for selected ttys
+tty0::respawn:/sbin/getty 115200 tty0
+
+# Put a getty on the serial port
+console::respawn:/sbin/getty -L console 0 vt100
+
+# Stuff to do for the 3-finger salute
+::ctrlaltdel:/sbin/reboot
+
+# Stuff to do before rebooting
+::shutdown:/etc/init.d/rcK
+::shutdown:/sbin/swapoff -a
+::shutdown:/bin/umount -a -r
+
diff --git a/configs/snps_axs101_defconfig b/configs/snps_axs101_defconfig
new file mode 100644
index 0000000..6af4ac3
--- /dev/null
+++ b/configs/snps_axs101_defconfig
@@ -0,0 +1,13 @@
+BR2_arcle=y
+BR2_TARGET_GENERIC_HOSTNAME="axs101"
+BR2_TARGET_GENERIC_ISSUE="Welcome to the ARC Software Development Platform"
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_OVERLAY="board/synopsys/axs10x/fs-overlay"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.2-rc5"
+BR2_LINUX_KERNEL_DEFCONFIG="axs101"
+BR2_TARGET_ROOTFS_INITRAMFS=y
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="axs101"
diff --git a/configs/snps_axs103_defconfig b/configs/snps_axs103_defconfig
new file mode 100644
index 0000000..40e4fac
--- /dev/null
+++ b/configs/snps_axs103_defconfig
@@ -0,0 +1,14 @@
+BR2_arcle=y
+BR2_archs38=y
+BR2_TARGET_GENERIC_HOSTNAME="axs103"
+BR2_TARGET_GENERIC_ISSUE="Welcome to the ARC Software Development Platform"
+BR2_SYSTEM_DHCP="eth0"
+BR2_ROOTFS_OVERLAY="board/synopsys/axs10x/fs-overlay"
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.2-rc5"
+BR2_LINUX_KERNEL_DEFCONFIG="axs103_smp"
+BR2_TARGET_ROOTFS_INITRAMFS=y
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BUILD_SYSTEM_KCONFIG=y
+BR2_TARGET_UBOOT_BOARD_DEFCONFIG="axs103"
-- 
2.4.3