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authorWaldemar Brodkorb <wbx@openadk.org>2019-10-29 15:26:35 +0100
committerWaldemar Brodkorb <wbx@openadk.org>2019-10-29 15:42:40 +0100
commit4c6c03c3152d6b9f8c08746e797781566b2fc2cb (patch)
treef91d1abdb520f52087b3b4775b5fb9f4448117d9 /target
parente8a52fd6a3dd4693849a99edd217c38bacb5401d (diff)
csky: rework qemu support
Diffstat (limited to 'target')
-rw-r--r--target/config/Config.in.compiler5
-rw-r--r--target/config/Config.in.cpu23
-rw-r--r--target/config/Config.in.endian3
-rw-r--r--target/config/Config.in.libc2
-rw-r--r--target/config/Config.in.qemuopts12
-rw-r--r--target/csky/Makefile8
-rw-r--r--target/csky/kernel/qemu-csky (renamed from target/csky/kernel/qemu-csky-ck610)1
-rw-r--r--target/csky/kernel/qemu-csky-ck8078
-rw-r--r--target/csky/kernel/qemu-csky-ck8108
-rw-r--r--target/csky/systems/qemu-csky7
-rw-r--r--target/csky/systems/qemu-csky-ck8078
-rw-r--r--target/csky/systems/qemu-csky-ck8108
-rw-r--r--target/linux/Config.in.kernelversion4
-rw-r--r--target/linux/config/Config.in.ethernet12
-rw-r--r--target/linux/config/Config.in.serial12
15 files changed, 43 insertions, 78 deletions
diff --git a/target/config/Config.in.compiler b/target/config/Config.in.compiler
index 19aaba3b7..cac84f5ba 100644
--- a/target/config/Config.in.compiler
+++ b/target/config/Config.in.compiler
@@ -14,7 +14,6 @@ prompt "GCC version"
depends on ADK_BUILD_COMPILER_GCC
default ADK_TOOLCHAIN_GCC_ARC if ADK_TARGET_ARCH_ARC
default ADK_TOOLCHAIN_GCC_AVR32 if ADK_TARGET_ARCH_AVR32
-default ADK_TOOLCHAIN_GCC_CSKY if ADK_TARGET_ARCH_CSKY
default ADK_TOOLCHAIN_GCC_LM32 if ADK_TARGET_ARCH_LM32
default ADK_TOOLCHAIN_GCC_METAG if ADK_TARGET_ARCH_METAG
default ADK_TOOLCHAIN_GCC_NDS32 if ADK_TARGET_ARCH_NDS32
@@ -66,10 +65,6 @@ config ADK_TOOLCHAIN_GCC_AVR32
bool "4.4.7-avr32"
depends on ADK_TARGET_ARCH_AVR32
-config ADK_TOOLCHAIN_GCC_CSKY
- bool "6.3.0-csky"
- depends on ADK_TARGET_ARCH_CSKY
-
config ADK_TOOLCHAIN_GCC_METAG
bool "4.2.4-metag"
depends on ADK_TARGET_ARCH_METAG
diff --git a/target/config/Config.in.cpu b/target/config/Config.in.cpu
index 77214193a..d737c96ab 100644
--- a/target/config/Config.in.cpu
+++ b/target/config/Config.in.cpu
@@ -440,6 +440,14 @@ config ADK_TARGET_CPU_CSKY_CK807
select ADK_TARGET_WITH_MMU
depends on ADK_TARGET_ARCH_CSKY
+config ADK_TARGET_CPU_CSKY_CK807F
+ bool "ck807f"
+ select ADK_TARGET_SUPPORTS_THREADS
+ select ADK_TARGET_SUPPORTS_NPTL
+ select ADK_TARGET_WITH_MMU
+ select ADK_TARGET_CPU_WITH_FPU
+ depends on ADK_TARGET_ARCH_CSKY
+
config ADK_TARGET_CPU_CSKY_CK810
bool "ck810"
select ADK_TARGET_SUPPORTS_THREADS
@@ -447,6 +455,14 @@ config ADK_TARGET_CPU_CSKY_CK810
select ADK_TARGET_WITH_MMU
depends on ADK_TARGET_ARCH_CSKY
+config ADK_TARGET_CPU_CSKY_CK810F
+ bool "ck810f"
+ select ADK_TARGET_SUPPORTS_THREADS
+ select ADK_TARGET_SUPPORTS_NPTL
+ select ADK_TARGET_WITH_MMU
+ select ADK_TARGET_CPU_WITH_FPU
+ depends on ADK_TARGET_ARCH_CSKY
+
# epiphany
config ADK_TARGET_CPU_EPIPHANY
bool "epiphany"
@@ -1869,6 +1885,10 @@ config ADK_TARGET_GCC_CPU
default "cortex-m3" if ADK_TARGET_CPU_ARM_CORTEX_M3
default "cortex-m4" if ADK_TARGET_CPU_ARM_CORTEX_M4
default "cortex-m7" if ADK_TARGET_CPU_ARM_CORTEX_M7
+ default "ck807" if ADK_TARGET_CPU_CSKY_CK807
+ default "ck810" if ADK_TARGET_CPU_CSKY_CK810
+ default "ck807f" if ADK_TARGET_CPU_CSKY_CK807F
+ default "ck810f" if ADK_TARGET_CPU_CSKY_CK810F
default "ev4" if ADK_TARGET_CPU_ALPHA_EV4
default "ev5" if ADK_TARGET_CPU_ALPHA_EV5
default "ev6" if ADK_TARGET_CPU_ALPHA_EV6
@@ -1984,9 +2004,10 @@ config ADK_TARGET_CPU_FLAGS
default "-mcpu=bf549m" if ADK_TARGET_CPU_BFIN_BF549M
default "-mcpu=bf561" if ADK_TARGET_CPU_BFIN_BF561
default "-mcpu=bf592" if ADK_TARGET_CPU_BFIN_BF592
- default "-mcpu=ck610" if ADK_TARGET_CPU_CSKY_CK610
default "-mcpu=ck807" if ADK_TARGET_CPU_CSKY_CK807
default "-mcpu=ck810" if ADK_TARGET_CPU_CSKY_CK810
+ default "-mcpu=ck807f" if ADK_TARGET_CPU_CSKY_CK807F
+ default "-mcpu=ck810f" if ADK_TARGET_CPU_CSKY_CK810F
default "-mcpu=v10" if ADK_TARGET_CPU_CRIS_CRISV10
default "-mcpu=v32" if ADK_TARGET_CPU_CRIS_CRISV32
default "-mh" if ADK_TARGET_CPU_H8300H
diff --git a/target/config/Config.in.endian b/target/config/Config.in.endian
index cecc4cd36..2fb382ab9 100644
--- a/target/config/Config.in.endian
+++ b/target/config/Config.in.endian
@@ -17,8 +17,7 @@ depends on ADK_TARGET_SYSTEM_GENERIC_ARC \
|| ADK_TARGET_SYSTEM_GENERIC_XTENSA \
|| ADK_TARGET_SYSTEM_SYNOPSYS_NSIM \
|| ADK_TARGET_SYSTEM_QEMU_AARCH64 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK807 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK810 \
+ || ADK_TARGET_SYSTEM_QEMU_CSKY \
|| ADK_TARGET_SYSTEM_QEMU_MICROBLAZE_ML605 \
|| ADK_TARGET_SYSTEM_QEMU_MICROBLAZE_S3ADSP1800 \
|| ADK_TARGET_SYSTEM_QEMU_MIPS \
diff --git a/target/config/Config.in.libc b/target/config/Config.in.libc
index a2d0516df..fe9a8135a 100644
--- a/target/config/Config.in.libc
+++ b/target/config/Config.in.libc
@@ -227,7 +227,7 @@ config ADK_TARGET_SUFFIX
default "uclibcabi32" if ADK_TARGET_LIB_UCLIBC_NG && ADK_TARGET_ABI_O32
default "uclibc32" if ADK_TARGET_LIB_UCLIBC_NG && ADK_TARGET_ABI_32 && ADK_LINUX_64
default "uclibcspe" if ADK_TARGET_LIB_UCLIBC_NG && ADK_TARGET_ARCH_PPC && ADK_TARGET_ARCH_PPC_WITH_SPE
- default "uclibcabiv2" if ADK_TARGET_LIB_UCLIBC_NG && (ADK_TARGET_CPU_CSKY_CK807 || ADK_TARGET_CPU_CSKY_CK810)
+ default "uclibcabiv2" if ADK_TARGET_LIB_UCLIBC_NG && ADK_TARGET_ARCH_CSKY
default "uclibc" if ADK_TARGET_LIB_UCLIBC_NG
default "musleabihf" if ADK_TARGET_LIB_MUSL && ADK_TARGET_ARCH_ARM && ADK_TARGET_HARD_FLOAT
default "musleabi" if ADK_TARGET_LIB_MUSL && ADK_TARGET_ARCH_ARM
diff --git a/target/config/Config.in.qemuopts b/target/config/Config.in.qemuopts
index 3a708885a..f24af9a6b 100644
--- a/target/config/Config.in.qemuopts
+++ b/target/config/Config.in.qemuopts
@@ -38,9 +38,7 @@ menu "Qemu system configuration"
depends on ADK_TARGET_QEMU && (ADK_TARGET_SYSTEM_QEMU_X86_64 \
|| ADK_TARGET_SYSTEM_QEMU_RISCV32 \
|| ADK_TARGET_SYSTEM_QEMU_RISCV64 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK610 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK807 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK810 \
+ || ADK_TARGET_SYSTEM_QEMU_CSKY \
|| ADK_TARGET_SYSTEM_QEMU_X86 \
|| ADK_TARGET_SYSTEM_QEMU_AARCH64 \
|| ADK_TARGET_SYSTEM_QEMU_SPARC64)
@@ -98,15 +96,11 @@ depends on ADK_TARGET_SYSTEM_QEMU_SPARC64 || \
ADK_TARGET_SYSTEM_QEMU_AARCH64 || \
ADK_TARGET_SYSTEM_QEMU_RISCV32 || \
ADK_TARGET_SYSTEM_QEMU_RISCV64 || \
- ADK_TARGET_SYSTEM_QEMU_CSKY_CK610 || \
- ADK_TARGET_SYSTEM_QEMU_CSKY_CK807 || \
- ADK_TARGET_SYSTEM_QEMU_CSKY_CK810 || \
+ ADK_TARGET_SYSTEM_QEMU_CSKY || \
ADK_TARGET_SYSTEM_QEMU_X86 || \
ADK_TARGET_SYSTEM_QEMU_X86_64
default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_AARCH64
-default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_CSKY_CK610
-default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_CSKY_CK807
-default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_CSKY_CK810
+default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_CSKY
default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_RISCV32
default ADK_TARGET_QEMU_WITH_VIRTIO if ADK_TARGET_SYSTEM_QEMU_RISCV64
diff --git a/target/csky/Makefile b/target/csky/Makefile
index 83f4363f7..a79b2c4d7 100644
--- a/target/csky/Makefile
+++ b/target/csky/Makefile
@@ -7,12 +7,10 @@ include $(ADK_TOPDIR)/mk/image.mk
KERNEL:=$(LINUX_DIR)/$(ADK_TARGET_KERNEL)
-QEMU_ARGS:=${ADK_QEMU_ARGS} -M virt
-ifeq ($(ADK_TARGET_SYSTEM_QEMU_CSKY_CK807),y)
-QEMU:=qemu-system-cskyv2
-endif
-ifeq ($(ADK_TARGET_SYSTEM_QEMU_CSKY_CK810),y)
QEMU:=qemu-system-cskyv2
+ifeq ($(ADK_TARGET_QEMU_WITH_VIRTIO),y)
+QEMU_ARGS:=${ADK_QEMU_ARGS} -M virt
+QEMU_ARGS+=-netdev user,id=eth0 -device virtio-net-device,netdev=eth0
endif
# target helper text
diff --git a/target/csky/kernel/qemu-csky-ck610 b/target/csky/kernel/qemu-csky
index 0b5df804f..1d06909b6 100644
--- a/target/csky/kernel/qemu-csky-ck610
+++ b/target/csky/kernel/qemu-csky
@@ -1,5 +1,4 @@
CONFIG_CSKY=y
-CONFIG_CPU_CK610=y
CONFIG_CSKY_IRQ=y
CONFIG_RAM_BASE=0x0
CONFIG_NATIONALCHIP_IRQ=y
diff --git a/target/csky/kernel/qemu-csky-ck807 b/target/csky/kernel/qemu-csky-ck807
deleted file mode 100644
index ea91eeffe..000000000
--- a/target/csky/kernel/qemu-csky-ck807
+++ /dev/null
@@ -1,8 +0,0 @@
-CONFIG_CSKY=y
-CONFIG_CPU_CK807=y
-CONFIG_CSKY_IRQ=y
-CONFIG_RAM_BASE=0x0
-CONFIG_NATIONALCHIP_IRQ=y
-CONFIG_NATIONALCHIP_TIMER=y
-CONFIG_CSKYMAC=y
-CONFIG_SECTION_MISMATCH_WARN_ONLY=y
diff --git a/target/csky/kernel/qemu-csky-ck810 b/target/csky/kernel/qemu-csky-ck810
deleted file mode 100644
index 6abd83aa8..000000000
--- a/target/csky/kernel/qemu-csky-ck810
+++ /dev/null
@@ -1,8 +0,0 @@
-CONFIG_CSKY=y
-CONFIG_CPU_CK810=y
-CONFIG_CSKY_IRQ=y
-CONFIG_RAM_BASE=0x0
-CONFIG_NATIONALCHIP_IRQ=y
-CONFIG_NATIONALCHIP_TIMER=y
-CONFIG_CSKYMAC=y
-CONFIG_SECTION_MISMATCH_WARN_ONLY=y
diff --git a/target/csky/systems/qemu-csky b/target/csky/systems/qemu-csky
new file mode 100644
index 000000000..ee38d08c5
--- /dev/null
+++ b/target/csky/systems/qemu-csky
@@ -0,0 +1,7 @@
+config ADK_TARGET_SYSTEM_QEMU_CSKY
+ bool "Qemu Emulator"
+ select ADK_TARGET_QEMU
+ select ADK_TARGET_KERNEL_WITH_COMPRESSION
+ help
+ Qemu Emulator for C-SKY architecture.
+
diff --git a/target/csky/systems/qemu-csky-ck807 b/target/csky/systems/qemu-csky-ck807
deleted file mode 100644
index c938c70cd..000000000
--- a/target/csky/systems/qemu-csky-ck807
+++ /dev/null
@@ -1,8 +0,0 @@
-config ADK_TARGET_SYSTEM_QEMU_CSKY_CK807
- bool "Qemu Emulator (ck807)"
- select ADK_TARGET_QEMU
- select ADK_TARGET_CPU_CSKY_CK807
- select ADK_TARGET_KERNEL_WITH_COMPRESSION
- help
- Qemu Emulator for C-SKY architecture (ck807).
-
diff --git a/target/csky/systems/qemu-csky-ck810 b/target/csky/systems/qemu-csky-ck810
deleted file mode 100644
index 68a431588..000000000
--- a/target/csky/systems/qemu-csky-ck810
+++ /dev/null
@@ -1,8 +0,0 @@
-config ADK_TARGET_SYSTEM_QEMU_CSKY_CK810
- bool "Qemu Emulator (ck810)"
- select ADK_TARGET_QEMU
- select ADK_TARGET_CPU_CSKY_CK810
- select ADK_TARGET_KERNEL_WITH_COMPRESSION
- help
- Qemu Emulator for C-SKY architecture (ck810).
-
diff --git a/target/linux/Config.in.kernelversion b/target/linux/Config.in.kernelversion
index df2de3ffa..8a6ab33c7 100644
--- a/target/linux/Config.in.kernelversion
+++ b/target/linux/Config.in.kernelversion
@@ -207,7 +207,6 @@ config ADK_TARGET_LINUX_KERNEL_GIT_REPO
default "https://github.com/beagleboard/linux.git" if ADK_TARGET_SYSTEM_BEAGLEBONE_BLACK
default "https://git.phytec.de/git/linux-ti.git" if ADK_TARGET_SYSTEM_PHYTEC_WEGA
default "https://github.com/m-labs/linux-milkymist.git" if ADK_TARGET_ARCH_LM32
- default "https://github.com/c-sky/linux-4.9.y.git" if ADK_TARGET_ARCH_CSKY
default "https://github.com/riscv/riscv-linux.git" if ADK_TARGET_ARCH_RISCV32
default "https://github.com/riscv/riscv-linux.git" if ADK_TARGET_ARCH_RISCV64
default "git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git"
@@ -217,7 +216,6 @@ config ADK_TARGET_LINUX_KERNEL_GIT_REPO
config ADK_TARGET_LINUX_KERNEL_GIT_REPO_NAME
string
depends on ADK_TARGET_LINUX_KERNEL_VERSION_GIT
- default "csky" if ADK_TARGET_ARCH_CSKY
default "lm32" if ADK_TARGET_ARCH_LM32
default "riscv" if ADK_TARGET_ARCH_RISCV32
default "riscv" if ADK_TARGET_ARCH_RISCV64
@@ -233,7 +231,6 @@ config ADK_TARGET_LINUX_KERNEL_GIT_REPO_NAME
config ADK_TARGET_LINUX_KERNEL_GIT
string "git version"
depends on ADK_TARGET_LINUX_KERNEL_VERSION_GIT
- default "10c530f34ed3fb9eb89ff7d7a95df62a2072b623" if ADK_TARGET_ARCH_CSKY
default "6a2f2e4198eaff63ee75f6085ce9f966c47b4441" if ADK_TARGET_ARCH_LM32
default "a2092141807514666a273971cc8fa9e80f14439f" if ADK_TARGET_BOARD_BCM28XX
default "f8d3b2a0fa5054aaed0f14cd457db9d8922bb167" if ADK_TARGET_SYSTEM_ADSP_BF537
@@ -248,7 +245,6 @@ config ADK_TARGET_LINUX_KERNEL_GIT
config ADK_TARGET_LINUX_KERNEL_GIT_VER
string "kernel version"
depends on ADK_TARGET_LINUX_KERNEL_VERSION_GIT
- default "4.9.56" if ADK_TARGET_ARCH_CSKY
default "4.18.0" if ADK_TARGET_ARCH_RISCV32
default "4.18.0" if ADK_TARGET_ARCH_RISCV64
default "4.14.43" if ADK_TARGET_BOARD_BCM28XX
diff --git a/target/linux/config/Config.in.ethernet b/target/linux/config/Config.in.ethernet
index fe78e55a3..9a98c8ef1 100644
--- a/target/linux/config/Config.in.ethernet
+++ b/target/linux/config/Config.in.ethernet
@@ -484,22 +484,16 @@ config ADK_LINUX_KERNEL_STMMAC_ETH
select ADK_LINUX_KERNEL_STMMAC_PLATFORM
select ADK_LINUX_KERNEL_DWMAC_SUNXI if ADK_TARGET_SYSTEM_BANANA_PRO \
|| ADK_TARGET_SYSTEM_ORANGE_PI0
- select ADK_LINUX_KERNEL_DWMAC_GENERIC if ADK_TARGET_SYSTEM_QEMU_CSKY_CK610
- select ADK_LINUX_KERNEL_DWMAC_GENERIC if ADK_TARGET_SYSTEM_QEMU_CSKY_CK807
- select ADK_LINUX_KERNEL_DWMAC_GENERIC if ADK_TARGET_SYSTEM_QEMU_CSKY_CK810
+ select ADK_LINUX_KERNEL_DWMAC_GENERIC if ADK_TARGET_SYSTEM_QEMU_CSKY
select ADK_LINUX_KERNEL_DWMAC_GENERIC if ADK_TARGET_SYSTEM_SYNOPSYS_HSDK
select ADK_LINUX_KERNEL_MICREL_PHY if ADK_TARGET_SYSTEM_SYNOPSYS_HSDK
depends on ADK_TARGET_SYSTEM_BANANA_PRO \
|| ADK_TARGET_SYSTEM_ORANGE_PI0 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK610 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK807 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK810 \
+ || ADK_TARGET_SYSTEM_QEMU_CSKY \
|| ADK_TARGET_SYSTEM_SYNOPSYS_HSDK
default y if ADK_TARGET_SYSTEM_BANANA_PRO
default y if ADK_TARGET_SYSTEM_ORANGE_PI0
- default y if ADK_TARGET_SYSTEM_QEMU_CSKY_CK610
- default y if ADK_TARGET_SYSTEM_QEMU_CSKY_CK807
- default y if ADK_TARGET_SYSTEM_QEMU_CSKY_CK810
+ default y if ADK_TARGET_SYSTEM_QEMU_CSKY
default y if ADK_TARGET_SYSTEM_SYNOPSYS_HSDK
default n
diff --git a/target/linux/config/Config.in.serial b/target/linux/config/Config.in.serial
index c6fa0c6e1..44c78d80b 100644
--- a/target/linux/config/Config.in.serial
+++ b/target/linux/config/Config.in.serial
@@ -92,9 +92,7 @@ config ADK_LINUX_KERNEL_SERIAL_8250
select ADK_LINUX_KERNEL_SERIAL_8250_CONSOLE
select ADK_LINUX_KERNEL_SERIAL_OF_PLATFORM if ADK_TARGET_SYSTEM_XILINX_KINTEX7 \
|| ADK_TARGET_SYSTEM_IMGTEC_CI20 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK610 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK807 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK810 \
+ || ADK_TARGET_SYSTEM_QEMU_CSKY \
|| ADK_TARGET_SYSTEM_QEMU_XTENSA \
|| ADK_TARGET_SYSTEM_QEMU_MICROBLAZE_ML605 \
|| ADK_TARGET_SYSTEM_QEMU_NIOS2 \
@@ -121,9 +119,7 @@ config ADK_LINUX_KERNEL_SERIAL_8250
|| ADK_TARGET_SYSTEM_QEMU_MIPS \
|| ADK_TARGET_SYSTEM_QEMU_MIPS64 \
|| ADK_TARGET_SYSTEM_QEMU_ALPHA \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK610 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK807 \
- || ADK_TARGET_SYSTEM_QEMU_CSKY_CK810 \
+ || ADK_TARGET_SYSTEM_QEMU_CSKY \
|| ADK_TARGET_SYSTEM_QEMU_HPPA \
|| ADK_TARGET_SYSTEM_QEMU_NIOS2 \
|| ADK_TARGET_SYSTEM_QEMU_OR1K \
@@ -153,9 +149,7 @@ config ADK_LINUX_KERNEL_SERIAL_8250
default y if ADK_TARGET_SYSTEM_QEMU_MIPS
default y if ADK_TARGET_SYSTEM_QEMU_MIPS64
default y if ADK_TARGET_SYSTEM_QEMU_ALPHA
- default y if ADK_TARGET_SYSTEM_QEMU_CSKY_CK610
- default y if ADK_TARGET_SYSTEM_QEMU_CSKY_CK807
- default y if ADK_TARGET_SYSTEM_QEMU_CSKY_CK810
+ default y if ADK_TARGET_SYSTEM_QEMU_CSKY
default y if ADK_TARGET_SYSTEM_QEMU_HPPA
default y if ADK_TARGET_SYSTEM_QEMU_NIOS2
default y if ADK_TARGET_SYSTEM_QEMU_OR1K