[LEDE-DEV] [RFC] target: armvirt: new target

Thu Nov 24 08:03:54 PST 2016

An ARM Cortex-A machine provided by QEMU.

Kernel drivers enabled:

 - pl011, uart
 - pl031, rtc
 - pl061, gpio
 - pci-host-generic
 - virtio_{mmio,pci,net,blk,scsi,console,balloon}
 - ext4
 - DEBUG_BUGVERBOSE for debug purposes
 - neon, vfp extensions support (otherwise userland will fail with
   illegal instruction signal (code 0x00000004))

Signed-off-by: Yousong Zhou <yszhou4tech at gmail.com>
---
I prepared this target initially only for the purposes of proper testing KVM
support on Cubieboard2 as I cannot find an usable prebuilt binary on the net.

It is posted as RFC because it will introduce a new target combination
cortex-a15_neon and may place an extra burden on the build system of LEDE and
the target users at the moment may be quite small.

Anyway it is posted here in case someone may be interested to play with it and
to quote the lwn.net article [1]

 > we can only speculate about its future uses in the green data center of the
 > future, as the hypervisor of choice for ARM-based networking equipment, or
 > even ARM-based laptops and desktops.

Prebuilt binaries are uploaded to Google Drive [2] in case someone may want to
give it a quick try

 [1] Supporting KVM on the ARM architecture, https://lwn.net/Articles/557132/
 [2] https://drive.google.com/drive/folders/0B0ollk-mJJJAUGplUnJaZ2RuUW8

 target/linux/armvirt/Makefile                      |  27 +++
 target/linux/armvirt/README                        |  14 ++
 .../linux/armvirt/base-files/etc/board.d/00_model  |  14 ++
 target/linux/armvirt/base-files/etc/inittab        |   3 +
 target/linux/armvirt/config-default                | 230 +++++++++++++++++++++
 target/linux/armvirt/image/Makefile                |  24 +++
 6 files changed, 312 insertions(+)
 create mode 100644 target/linux/armvirt/Makefile
 create mode 100644 target/linux/armvirt/README
 create mode 100755 target/linux/armvirt/base-files/etc/board.d/00_model
 create mode 100644 target/linux/armvirt/base-files/etc/inittab
 create mode 100644 target/linux/armvirt/config-default
 create mode 100644 target/linux/armvirt/image/Makefile

diff --git a/target/linux/armvirt/Makefile b/target/linux/armvirt/Makefile
new file mode 100644
index 0000000..f0d063e
--- /dev/null
+++ b/target/linux/armvirt/Makefile
@@ -0,0 +1,27 @@
+#
+# Copyright (C) 2016 Yousong Zhou <yszhou4tech at gmail.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+
+ARCH:=arm
+BOARD:=armvirt
+BOARDNAME:=QEMU ARM Virtual Machine
+FEATURES:=ext4 fpu pci ramdisk rtc
+CPU_TYPE:=cortex-a15
+CPU_SUBTYPE:=neon
+MAINTAINER:=Yousong Zhou <yszhou4tech at gmail.com>
+
+KERNEL_PATCHVER:=4.4
+
+define Target/Description
+  Build images for QEMU ARM Virtual Machine
+endef
+
+include $(INCLUDE_DIR)/target.mk
+
+KERNELNAME:=zImage
+
+$(eval $(call BuildTarget))
diff --git a/target/linux/armvirt/README b/target/linux/armvirt/README
new file mode 100644
index 0000000..6ccb628
--- /dev/null
+++ b/target/linux/armvirt/README
@@ -0,0 +1,14 @@
+This is intended to be used with LEDE project to provide image for use with
+QEMU arm-softmmu virt machine.
+
+Example usages
+
+	# boot with initramfs embedded in
+	qemu-system-arm -nographic -M virt -m 64 -kernel lede-armvirt-zImage-initramfs
+
+	# boot with accel=kvm
+	qemu-system-arm -nographic -M virt,accel=kvm -cpu host -m 64 -kernel lede-armvirt-zImage-initramfs
+
+	# boot with a separate rootfs
+	qemu-system-arm -nographic -M virt -m 64 -kernel lede-armvirt-zImage \
+	  -drive file=lede-armvirt-root.ext4,format=raw,if=virtio -append 'root=/dev/vda rootwait'
diff --git a/target/linux/armvirt/base-files/etc/board.d/00_model b/target/linux/armvirt/base-files/etc/board.d/00_model
new file mode 100755
index 0000000..6ba51b8
--- /dev/null
+++ b/target/linux/armvirt/base-files/etc/board.d/00_model
@@ -0,0 +1,14 @@
+#!/bin/sh
+# Copyright (C) 2015 OpenWrt.org
+# Copyright (C) 2016 Yousong Zhou <yszhou4tech at gmail.com>
+
+. /lib/functions/uci-defaults.sh
+
+board_config_update
+
+ucidef_set_board_id "armvirt"
+ucidef_set_model_name "QEMU ARM Virtual Machine"
+
+board_config_flush
+
+exit 0
diff --git a/target/linux/armvirt/base-files/etc/inittab b/target/linux/armvirt/base-files/etc/inittab
new file mode 100644
index 0000000..9991ac4
--- /dev/null
+++ b/target/linux/armvirt/base-files/etc/inittab
@@ -0,0 +1,3 @@
+::sysinit:/etc/init.d/rcS S boot
+::shutdown:/etc/init.d/rcS K shutdown
+ttyAMA0::askfirst:/usr/libexec/login.sh
diff --git a/target/linux/armvirt/config-default b/target/linux/armvirt/config-default
new file mode 100644
index 0000000..e39cff8
--- /dev/null
+++ b/target/linux/armvirt/config-default
@@ -0,0 +1,230 @@
+CONFIG_ALIGNMENT_TRAP=y
+CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE=y
+CONFIG_ARCH_HAS_ELF_RANDOMIZE=y
+CONFIG_ARCH_HAS_GCOV_PROFILE_ALL=y
+CONFIG_ARCH_HAS_SG_CHAIN=y
+CONFIG_ARCH_HAVE_CUSTOM_GPIO_H=y
+CONFIG_ARCH_HIBERNATION_POSSIBLE=y
+CONFIG_ARCH_MIGHT_HAVE_PC_PARPORT=y
+CONFIG_ARCH_MULTIPLATFORM=y
+# CONFIG_ARCH_MULTI_CPU_AUTO is not set
+CONFIG_ARCH_MULTI_V6_V7=y
+CONFIG_ARCH_MULTI_V7=y
+CONFIG_ARCH_NR_GPIO=0
+# CONFIG_ARCH_SELECT_MEMORY_MODEL is not set
+# CONFIG_ARCH_SPARSEMEM_DEFAULT is not set
+CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
+CONFIG_ARCH_SUPPORTS_UPROBES=y
+CONFIG_ARCH_SUSPEND_POSSIBLE=y
+CONFIG_ARCH_USE_BUILTIN_BSWAP=y
+CONFIG_ARCH_USE_CMPXCHG_LOCKREF=y
+CONFIG_ARCH_VIRT=y
+CONFIG_ARCH_WANT_GENERAL_HUGETLB=y
+CONFIG_ARCH_WANT_IPC_PARSE_VERSION=y
+CONFIG_ARCH_WANT_OPTIONAL_GPIOLIB=y
+CONFIG_ARM=y
+CONFIG_ARM_AMBA=y
+CONFIG_ARM_ARCH_TIMER=y
+CONFIG_ARM_ARCH_TIMER_EVTSTREAM=y
+# CONFIG_ARM_CPU_SUSPEND is not set
+CONFIG_ARM_GIC=y
+CONFIG_ARM_GIC_V3=y
+CONFIG_ARM_HAS_SG_CHAIN=y
+CONFIG_ARM_HEAVY_MB=y
+CONFIG_ARM_L1_CACHE_SHIFT=6
+CONFIG_ARM_L1_CACHE_SHIFT_6=y
+# CONFIG_ARM_LPAE is not set
+CONFIG_ARM_PATCH_PHYS_VIRT=y
+CONFIG_ARM_PSCI=y
+CONFIG_ARM_PSCI_FW=y
+# CONFIG_ARM_SP805_WATCHDOG is not set
+CONFIG_ARM_THUMB=y
+# CONFIG_ARM_THUMBEE is not set
+CONFIG_ARM_VIRT_EXT=y
+CONFIG_AUTO_ZRELADDR=y
+CONFIG_CACHE_L2X0=y
+CONFIG_CLKDEV_LOOKUP=y
+CONFIG_CLKSRC_OF=y
+CONFIG_CLKSRC_PROBE=y
+CONFIG_CLONE_BACKWARDS=y
+CONFIG_COMMON_CLK=y
+CONFIG_CPU_32v6K=y
+CONFIG_CPU_32v7=y
+CONFIG_CPU_ABRT_EV7=y
+# CONFIG_CPU_BPREDICT_DISABLE is not set
+CONFIG_CPU_CACHE_V7=y
+CONFIG_CPU_CACHE_VIPT=y
+CONFIG_CPU_COPY_V6=y
+CONFIG_CPU_CP15=y
+CONFIG_CPU_CP15_MMU=y
+CONFIG_CPU_HAS_ASID=y
+# CONFIG_CPU_ICACHE_DISABLE is not set
+CONFIG_CPU_PABRT_V7=y
+CONFIG_CPU_TLB_V7=y
+CONFIG_CPU_V7=y
+CONFIG_CRC16=y
+CONFIG_CRYPTO_CRC32C=y
+CONFIG_CRYPTO_HASH=y
+CONFIG_CRYPTO_HASH2=y
+CONFIG_CRYPTO_RNG2=y
+CONFIG_CRYPTO_WORKQUEUE=y
+CONFIG_DCACHE_WORD_ACCESS=y
+CONFIG_DEBUG_BUGVERBOSE=y
+CONFIG_DEBUG_LL_INCLUDE="mach/debug-macro.S"
+# CONFIG_DEBUG_UART_8250 is not set
+# CONFIG_DEBUG_USER is not set
+CONFIG_DTC=y
+CONFIG_EDAC_ATOMIC_SCRUB=y
+CONFIG_EDAC_SUPPORT=y
+CONFIG_EXT4_FS=y
+CONFIG_FIX_EARLYCON_MEM=y
+CONFIG_FRAME_POINTER=y
+CONFIG_FS_MBCACHE=y
+CONFIG_GENERIC_ALLOCATOR=y
+CONFIG_GENERIC_BUG=y
+CONFIG_GENERIC_CLOCKEVENTS=y
+CONFIG_GENERIC_IDLE_POLL_SETUP=y
+CONFIG_GENERIC_IO=y
+CONFIG_GENERIC_IRQ_SHOW=y
+CONFIG_GENERIC_IRQ_SHOW_LEVEL=y
+CONFIG_GENERIC_PCI_IOMAP=y
+CONFIG_GENERIC_SCHED_CLOCK=y
+CONFIG_GENERIC_SMP_IDLE_THREAD=y
+CONFIG_GENERIC_STRNCPY_FROM_USER=y
+CONFIG_GENERIC_STRNLEN_USER=y
+CONFIG_GPIOLIB=y
+CONFIG_GPIOLIB_IRQCHIP=y
+CONFIG_GPIO_DEVRES=y
+CONFIG_GPIO_PL061=y
+CONFIG_HANDLE_DOMAIN_IRQ=y
+CONFIG_HARDIRQS_SW_RESEND=y
+CONFIG_HAS_DMA=y
+CONFIG_HAS_IOMEM=y
+CONFIG_HAS_IOPORT_MAP=y
+# CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
+CONFIG_HAVE_ARCH_AUDITSYSCALL=y
+CONFIG_HAVE_ARCH_BITREVERSE=y
+CONFIG_HAVE_ARCH_JUMP_LABEL=y
+CONFIG_HAVE_ARCH_KGDB=y
+CONFIG_HAVE_ARCH_PFN_VALID=y
+CONFIG_HAVE_ARCH_SECCOMP_FILTER=y
+CONFIG_HAVE_ARCH_TRACEHOOK=y
+CONFIG_HAVE_ARM_ARCH_TIMER=y
+# CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
+CONFIG_HAVE_BPF_JIT=y
+CONFIG_HAVE_CC_STACKPROTECTOR=y
+CONFIG_HAVE_CLK=y
+CONFIG_HAVE_CLK_PREPARE=y
+CONFIG_HAVE_CONTEXT_TRACKING=y
+CONFIG_HAVE_C_RECORDMCOUNT=y
+CONFIG_HAVE_DEBUG_KMEMLEAK=y
+CONFIG_HAVE_DMA_API_DEBUG=y
+CONFIG_HAVE_DMA_ATTRS=y
+CONFIG_HAVE_DMA_CONTIGUOUS=y
+CONFIG_HAVE_DYNAMIC_FTRACE=y
+CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS=y
+CONFIG_HAVE_FTRACE_MCOUNT_RECORD=y
+CONFIG_HAVE_FUNCTION_GRAPH_TRACER=y
+CONFIG_HAVE_FUNCTION_TRACER=y
+CONFIG_HAVE_GENERIC_DMA_COHERENT=y
+CONFIG_HAVE_IDE=y
+CONFIG_HAVE_IRQ_TIME_ACCOUNTING=y
+CONFIG_HAVE_LATENCYTOP_SUPPORT=y
+CONFIG_HAVE_MEMBLOCK=y
+CONFIG_HAVE_MOD_ARCH_SPECIFIC=y
+CONFIG_HAVE_NET_DSA=y
+CONFIG_HAVE_OPROFILE=y
+CONFIG_HAVE_OPTPROBES=y
+CONFIG_HAVE_PERF_EVENTS=y
+CONFIG_HAVE_PERF_REGS=y
+CONFIG_HAVE_PERF_USER_STACK_DUMP=y
+CONFIG_HAVE_PROC_CPU=y
+CONFIG_HAVE_REGS_AND_STACK_ACCESS_API=y
+CONFIG_HAVE_SMP=y
+CONFIG_HAVE_SYSCALL_TRACEPOINTS=y
+CONFIG_HAVE_UID16=y
+CONFIG_HAVE_VIRT_CPU_ACCOUNTING_GEN=y
+CONFIG_HVC_DRIVER=y
+CONFIG_HZ_FIXED=0
+CONFIG_HZ_PERIODIC=y
+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_IOMMU_HELPER=y
+CONFIG_IRQCHIP=y
+CONFIG_IRQ_DOMAIN=y
+CONFIG_IRQ_DOMAIN_HIERARCHY=y
+CONFIG_IRQ_FORCED_THREADING=y
+CONFIG_IRQ_WORK=y
+CONFIG_JBD2=y
+CONFIG_LIBFDT=y
+CONFIG_MEMORY_BALLOON=y
+CONFIG_MIGHT_HAVE_CACHE_L2X0=y
+CONFIG_MIGHT_HAVE_PCI=y
+CONFIG_MODULES_USE_ELF_REL=y
+CONFIG_MULTI_IRQ_HANDLER=y
+CONFIG_NEED_DMA_MAP_STATE=y
+CONFIG_NEED_PER_CPU_KM=y
+CONFIG_NEON=y
+CONFIG_NO_BOOTMEM=y
+CONFIG_OF=y
+CONFIG_OF_ADDRESS=y
+CONFIG_OF_ADDRESS_PCI=y
+CONFIG_OF_EARLY_FLATTREE=y
+CONFIG_OF_FLATTREE=y
+CONFIG_OF_GPIO=y
+CONFIG_OF_IRQ=y
+CONFIG_OF_MTD=y
+CONFIG_OF_NET=y
+CONFIG_OF_PCI=y
+CONFIG_OF_PCI_IRQ=y
+CONFIG_OF_RESERVED_MEM=y
+CONFIG_OLD_SIGACTION=y
+CONFIG_OLD_SIGSUSPEND3=y
+CONFIG_OUTER_CACHE=y
+CONFIG_OUTER_CACHE_SYNC=y
+CONFIG_PAGE_OFFSET=0xC0000000
+CONFIG_PCI=y
+# CONFIG_PCI_DOMAINS_GENERIC is not set
+CONFIG_PCI_HOST_GENERIC=y
+CONFIG_PERF_USE_VMALLOC=y
+CONFIG_PGTABLE_LEVELS=2
+# CONFIG_PL310_ERRATA_588369 is not set
+# CONFIG_PL310_ERRATA_727915 is not set
+# CONFIG_PL310_ERRATA_753970 is not set
+# CONFIG_PL310_ERRATA_769419 is not set
+CONFIG_RATIONAL=y
+# CONFIG_RCU_STALL_COMMON is not set
+CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_PL031=y
+CONFIG_RWSEM_XCHGADD_ALGORITHM=y
+CONFIG_SCHED_HRTICK=y
+# CONFIG_SCHED_INFO is not set
+CONFIG_SCSI=y
+CONFIG_SCSI_VIRTIO=y
+CONFIG_SERIAL_8250_FSL=y
+# CONFIG_SERIAL_AMBA_PL010 is not set
+CONFIG_SERIAL_AMBA_PL011=y
+CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+CONFIG_SPARSE_IRQ=y
+CONFIG_SRCU=y
+CONFIG_SWIOTLB=y
+# CONFIG_SWP_EMULATE is not set
+CONFIG_SYS_SUPPORTS_APM_EMULATION=y
+# CONFIG_THUMB2_KERNEL is not set
+CONFIG_TICK_CPU_ACCOUNTING=y
+CONFIG_UNCOMPRESS_INCLUDE="debug/uncompress.h"
+CONFIG_USE_OF=y
+CONFIG_VECTORS_BASE=0xffff0000
+CONFIG_VFP=y
+CONFIG_VFPv3=y
+CONFIG_VIRTIO=y
+CONFIG_VIRTIO_BALLOON=y
+CONFIG_VIRTIO_BLK=y
+CONFIG_VIRTIO_CONSOLE=y
+CONFIG_VIRTIO_MMIO=y
+# CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES is not set
+CONFIG_VIRTIO_NET=y
+CONFIG_VIRTIO_PCI=y
+CONFIG_VIRTIO_PCI_LEGACY=y
+CONFIG_ZBOOT_ROM_BSS=0
+CONFIG_ZBOOT_ROM_TEXT=0
+CONFIG_ZONE_DMA_FLAG=0
diff --git a/target/linux/armvirt/image/Makefile b/target/linux/armvirt/image/Makefile
new file mode 100644
index 0000000..385917d
--- /dev/null
+++ b/target/linux/armvirt/image/Makefile
@@ -0,0 +1,24 @@
+#
+# Copyright (C) 2016 Yousong Zhou <yszhou4tech at gmail.com>
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/image.mk
+
+define Image/BuildKernel
+	cp $(KDIR)/zImage $(BIN_DIR)/$(IMG_PREFIX)-zImage
+endef
+
+define Image/Build/Initramfs
+	cp $(KDIR)/zImage-initramfs $(BIN_DIR)/$(IMG_PREFIX)-zImage-initramfs
+endef
+
+define Image/Build
+	$(call Image/Build/$(1))
+	dd if=$(KDIR)/root.$(1) bs=128k conv=sync | \
+		gzip -9n >$(BIN_DIR)/$(IMG_PREFIX)-root.$(1).gz
+endef
+
+$(eval $(call BuildImage))
-- 
2.6.4


