board: add blackfin gdb simulator support

With this config you can bootup a Linux kernel
in GDB simulator and test Blackfin kernel and
userland.

Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

board/gdb/bfin-bf512/linux-4.6.config

@@ -0,0 +1,87 @@
+# CONFIG_LOCALVERSION_AUTO is not set
+CONFIG_SYSVIPC=y
+CONFIG_BLK_DEV_INITRD=y
+# CONFIG_RD_GZIP is not set
+# CONFIG_RD_BZIP2 is not set
+# CONFIG_RD_LZMA is not set
+# CONFIG_RD_XZ is not set
+# CONFIG_RD_LZO is not set
+# CONFIG_RD_LZ4 is not set
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+# CONFIG_UID16 is not set
+# CONFIG_SGETMASK_SYSCALL is not set
+# CONFIG_SYSFS_SYSCALL is not set
+# CONFIG_KALLSYMS is not set
+# CONFIG_BUG is not set
+# CONFIG_BASE_FULL is not set
+# CONFIG_ADVISE_SYSCALLS is not set
+# CONFIG_MEMBARRIER is not set
+CONFIG_EMBEDDED=y
+# CONFIG_VM_EVENT_COUNTERS is not set
+# CONFIG_SLUB_DEBUG is not set
+# CONFIG_COMPAT_BRK is not set
+CONFIG_MODULES=y
+# CONFIG_BLOCK is not set
+CONFIG_BF512=y
+# CONFIG_SET_GENERIC_CLOCKEVENTS is not set
+# CONFIG_I_ENTRY_L1 is not set
+# CONFIG_EXCPT_IRQ_SYSC_L1 is not set
+# CONFIG_DO_IRQ_L1 is not set
+# CONFIG_CORE_TIMER_IRQ_L1 is not set
+# CONFIG_IDLE_L1 is not set
+# CONFIG_SCHEDULE_L1 is not set
+# CONFIG_ARITHMETIC_OPS_L1 is not set
+# CONFIG_ACCESS_OK_L1 is not set
+# CONFIG_MEMSET_L1 is not set
+# CONFIG_MEMCPY_L1 is not set
+# CONFIG_STRCMP_L1 is not set
+# CONFIG_STRNCMP_L1 is not set
+# CONFIG_STRCPY_L1 is not set
+# CONFIG_STRNCPY_L1 is not set
+# CONFIG_SYS_BFIN_SPINLOCK_L1 is not set
+# CONFIG_CACHELINE_ALIGNED_L1 is not set
+# CONFIG_DCACHE_FLUSH_L1 is not set
+# CONFIG_APP_STACK_L1 is not set
+# CONFIG_BFIN_INS_LOWOVERHEAD is not set
+# CONFIG_BFIN_ICACHE is not set
+# CONFIG_BFIN_DCACHE is not set
+# CONFIG_C_AMCKEN is not set
+CONFIG_BINFMT_ELF_FDPIC=y
+CONFIG_BINFMT_FLAT=y
+# CONFIG_COREDUMP is not set
+# CONFIG_SUSPEND is not set
+# CONFIG_UEVENT_HELPER is not set
+# CONFIG_STANDALONE is not set
+# CONFIG_PREVENT_FIRMWARE_BUILD is not set
+# CONFIG_FW_LOADER is not set
+# CONFIG_ALLOW_DEV_COREDUMP is not set
+# CONFIG_INPUT is not set
+# CONFIG_SERIO is not set
+# CONFIG_VT is not set
+# CONFIG_LEGACY_PTYS is not set
+CONFIG_SERIAL_BFIN=y
+CONFIG_SERIAL_BFIN_CONSOLE=y
+CONFIG_SERIAL_BFIN_UART0=y
+CONFIG_SERIAL_BFIN_UART1=y
+# CONFIG_BFIN_OTP is not set
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_USB_SUPPORT is not set
+# CONFIG_MANDATORY_FILE_LOCKING is not set
+# CONFIG_DNOTIFY is not set
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_NLS=y
+CONFIG_NLS_DEFAULT="utf-8"
+CONFIG_PRINTK_TIME=y
+# CONFIG_ENABLE_WARN_DEPRECATED is not set
+# CONFIG_ENABLE_MUST_CHECK is not set
+# CONFIG_SECTION_MISMATCH_WARN_ONLY is not set
+CONFIG_MAGIC_SYSRQ=y
+# CONFIG_SCHED_DEBUG is not set
+# CONFIG_FTRACE is not set
+# CONFIG_DEBUG_VERBOSE is not set
+# CONFIG_DEBUG_HUNT_FOR_ZERO is not set
+# CONFIG_DEBUG_BFIN_HWTRACE_ON is not set
+CONFIG_EARLY_PRINTK=y
+# CONFIG_ACCESS_CHECK is not set
+# CONFIG_CRC32 is not set

board/gdb/bfin-bf512/readme.txt

@@ -0,0 +1,11 @@
+Run the simulation with GDB for FDPIC:
+
+ ./output/host/usr/bin/bfin-buildroot-linux-uclibc-run --env operating --model bf512 output/images/vmlinux
+
+Run the simulation with GDB for FLAT:
+
+ ./output/host/usr/bin/bfin-buildroot-uclinux-uclibc-run --env operating --model bf512 output/images/vmlinux
+
+The login prompt will appear in the terminal that started GDB.
+
+Tested with GDB 7.9

board/gdb/post-build.sh

@@ -0,0 +1,4 @@
+#!/bin/sh
+# no simulated network devices at the moment
+rm -f ${TARGET_DIR}/etc/init.d/S40network
+rm -rf ${TARGET_DIR}/etc/network/

configs/gdb_bfin_bf512_defconfig

@@ -0,0 +1,34 @@
+# Architecture
+BR2_bfin=y
+BR2_bf512=y
+
+# Filesystem
+BR2_TARGET_ROOTFS_INITRAMFS=y
+# BR2_TARGET_ROOTFS_TAR is not set
+
+BR2_ROOTFS_POST_BUILD_SCRIPT="board/gdb/post-build.sh"
+
+# Linux headers same as kernel, a 4.6 series
+BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_6=y
+
+# Kernel
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION=y
+BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="4.6.3"
+BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y
+BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/gdb/bfin-bf512/linux-4.6.config"
+BR2_LINUX_KERNEL_VMLINUX=y
+
+# Serial port config
+BR2_TARGET_GENERIC_GETTY=y
+BR2_TARGET_GENERIC_GETTY_PORT="ttyBF0"
+
+# use minimal busybox with hush
+BR2_PACKAGE_BUSYBOX_CONFIG="package/busybox/busybox-minimal.config"
+
+# compile gdb sim
+BR2_PACKAGE_HOST_GDB=y
+# BR2_PACKAGE_HOST_GDB_TUI is not set
+# BR2_PACKAGE_HOST_GDB_PYTHON is not set
+BR2_PACKAGE_HOST_GDB_SIM=y
+

package/gdb/7.10.1/0005-fix-sim-compile.patch

@@ -0,0 +1,16 @@
+Fix compile on older systems with gcc 4.4.x.
+
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+
+diff -Nur gdb-7.10.1.orig//sim/common/sim-base.h gdb-7.10.1/sim/common/sim-base.h
+--- gdb-7.10.1.orig//sim/common/sim-base.h	2015-05-13 13:03:56.000000000 -0500
++++ gdb-7.10.1/sim/common/sim-base.h	2016-07-08 07:44:17.000000000 -0500
+@@ -72,8 +72,6 @@
+ #define INVALID_INSTRUCTION_ADDRESS ((address_word)0 - 1)
+ #endif
+ 
+-/* TODO: Probably should just delete SIM_CPU.  */
+-typedef struct _sim_cpu SIM_CPU;
+ typedef struct _sim_cpu sim_cpu;
+ 
+ #include "sim-module.h"

package/gdb/7.11.1/0001-fix-sim-compile.patch

@@ -0,0 +1,16 @@
+Fix compile on older systems with gcc 4.4.x
+
+Signed-off-by: Waldemar Brodkorb <wbx@openadk.org>
+
+diff -Nur gdb-7.11.1.orig//sim/common/sim-base.h gdb-7.11.1/sim/common/sim-base.h
+--- gdb-7.11.1.orig//sim/common/sim-base.h	2016-02-09 21:19:39.000000000 -0600
++++ gdb-7.11.1/sim/common/sim-base.h	2016-07-08 08:02:09.000000000 -0500
+@@ -72,8 +72,6 @@
+ #define INVALID_INSTRUCTION_ADDRESS ((address_word)0 - 1)
+ #endif
+ 
+-/* TODO: Probably should just delete SIM_CPU.  */
+-typedef struct _sim_cpu SIM_CPU;
+ typedef struct _sim_cpu sim_cpu;
+ 
+ #include "sim-module.h"

system/device_table_dev.txt

@@ -31,6 +31,7 @@
 /dev/ttyAM	c	666	0	0	204	16	0	1	3
 /dev/ttyCPM	c	666	0	0	204	46	0	1	4
 /dev/ttyAMA	c	666	0	0	204	64	0	1	4
+/dev/ttyBF	c	666	0	0	204	64	0	1	2
 /dev/ttySAC	c	666	0	0	204	64	0	1	4
 /dev/ttySC	c	666	0	0	204	8	0	1	8
 /dev/ttyPSC	c	666	0	0	204	148	0	1	4