MAINTAINER:=Alexey Brodkin <abrodkin@synopsys.com>
SUBTARGETS:=generic
-KERNEL_PATCHVER:=4.3
+KERNEL_PATCHVER:=4.4
DEVICE_TYPE:=developerboard
+++ /dev/null
-# CONFIG_16KSTACKS is not set
-CONFIG_ARC=y
-CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE=y
-# CONFIG_ARCH_HAS_GCOV_PROFILE_ALL is not set
-# CONFIG_ARCH_HAS_SG_CHAIN is not set
-CONFIG_ARCH_REQUIRE_GPIOLIB=y
-CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
-CONFIG_ARC_BUILTIN_DTB_NAME=""
-CONFIG_ARC_CACHE=y
-CONFIG_ARC_CACHE_LINE_SHIFT=5
-CONFIG_ARC_CACHE_PAGES=y
-# CONFIG_ARC_CACHE_VIPT_ALIASING is not set
-# CONFIG_ARC_CANT_LLSC is not set
-# CONFIG_ARC_COMPACT_IRQ_LEVELS is not set
-# CONFIG_ARC_CPU_750D is not set
-CONFIG_ARC_CPU_770=y
-CONFIG_ARC_CURR_IN_REG=y
-CONFIG_ARC_DBG=y
-# CONFIG_ARC_DBG_TLB_MISS_COUNT is not set
-# CONFIG_ARC_DBG_TLB_PARANOIA is not set
-CONFIG_ARC_DW2_UNWIND=y
-# CONFIG_ARC_EMUL_UNALIGNED is not set
-# CONFIG_ARC_FPU_SAVE_RESTORE is not set
-CONFIG_ARC_HAS_DCACHE=y
-# CONFIG_ARC_HAS_DCCM is not set
-CONFIG_ARC_HAS_HW_MPY=y
-CONFIG_ARC_HAS_ICACHE=y
-# CONFIG_ARC_HAS_ICCM is not set
-CONFIG_ARC_HAS_LLSC=y
-CONFIG_ARC_HAS_SWAPE=y
-# CONFIG_ARC_METAWARE_HLINK is not set
-# CONFIG_ARC_MMU_V1 is not set
-# CONFIG_ARC_MMU_V2 is not set
-CONFIG_ARC_MMU_V3=y
-# CONFIG_ARC_PAGE_SIZE_16K is not set
-# CONFIG_ARC_PAGE_SIZE_4K is not set
-CONFIG_ARC_PAGE_SIZE_8K=y
-CONFIG_ARC_PLAT_AXS10X=y
-CONFIG_ARC_PLAT_SIM=y
-# CONFIG_ARC_PLAT_TB10X is not set
-# CONFIG_ARC_UBOOT_SUPPORT is not set
-CONFIG_AXS101=y
-CONFIG_CLKDEV_LOOKUP=y
-CONFIG_CLONE_BACKWARDS=y
-CONFIG_COMMON_CLK=y
-# CONFIG_CPU_BIG_ENDIAN is not set
-CONFIG_CRYPTO_RNG2=y
-CONFIG_CRYPTO_WORKQUEUE=y
-CONFIG_DTC=y
-CONFIG_DWMAC_GENERIC=y
-# CONFIG_DWMAC_IPQ806X is not set
-# CONFIG_DWMAC_LPC18XX is not set
-# CONFIG_DWMAC_MESON is not set
-# CONFIG_DWMAC_ROCKCHIP is not set
-# CONFIG_DWMAC_SOCFPGA is not set
-# CONFIG_DWMAC_STI is not set
-# CONFIG_DWMAC_SUNXI is not set
-CONFIG_DW_APB_ICTL=y
-CONFIG_GENERIC_ATOMIC64=y
-CONFIG_GENERIC_CLOCKEVENTS=y
-CONFIG_GENERIC_CSUM=y
-CONFIG_GENERIC_FIND_FIRST_BIT=y
-CONFIG_GENERIC_IO=y
-CONFIG_GENERIC_IRQ_CHIP=y
-CONFIG_GENERIC_IRQ_SHOW=y
-CONFIG_GENERIC_SMP_IDLE_THREAD=y
-# CONFIG_GEN_RTC is not set
-CONFIG_GPIOLIB=y
-CONFIG_GPIO_DEVRES=y
-CONFIG_GPIO_DWAPB=y
-CONFIG_GPIO_GENERIC=y
-CONFIG_HAS_DMA=y
-CONFIG_HAS_IOMEM=y
-# CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
-# CONFIG_HAVE_ARCH_BITREVERSE is not set
-CONFIG_HAVE_ARCH_KGDB=y
-CONFIG_HAVE_ARCH_TRACEHOOK=y
-# CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
-CONFIG_HAVE_CLK=y
-CONFIG_HAVE_CLK_PREPARE=y
-CONFIG_HAVE_DEBUG_STACKOVERFLOW=y
-CONFIG_HAVE_FUTEX_CMPXCHG=y
-# CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
-CONFIG_HAVE_IOREMAP_PROT=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_PERF_EVENTS=y
-CONFIG_HZ_PERIODIC=y
-CONFIG_INITRAMFS_SOURCE=""
-CONFIG_IRQCHIP=y
-CONFIG_IRQ_DOMAIN=y
-CONFIG_IRQ_WORK=y
-CONFIG_ISA_ARCOMPACT=y
-# CONFIG_ISA_ARCV2 is not set
-CONFIG_KALLSYMS=y
-CONFIG_LIBFDT=y
-CONFIG_LINUX_LINK_BASE=0x80000000
-CONFIG_LZO_COMPRESS=y
-CONFIG_LZO_DECOMPRESS=y
-CONFIG_MAC80211_STA_HASH_MAX_SIZE=0
-CONFIG_MDIO_BOARDINFO=y
-CONFIG_MFD_SYSCON=y
-CONFIG_MMC=y
-CONFIG_MMC_DW=y
-# CONFIG_MMC_DW_EXYNOS is not set
-CONFIG_MMC_DW_IDMAC=y
-# CONFIG_MMC_DW_K3 is not set
-CONFIG_MMC_DW_PLTFM=y
-CONFIG_MMC_SDHCI=y
-# CONFIG_MMC_SDHCI_OF_AT91 is not set
-CONFIG_MMC_SDHCI_PLTFM=y
-CONFIG_MODULES_USE_ELF_RELA=y
-CONFIG_NATIONAL_PHY=y
-CONFIG_NEED_PER_CPU_KM=y
-# CONFIG_NET_CADENCE is not set
-CONFIG_NET_PTP_CLASSIFY=y
-# CONFIG_NET_VENDOR_ARC is not set
-# CONFIG_NET_VENDOR_BROADCOM is not set
-# CONFIG_NET_VENDOR_INTEL is not set
-# CONFIG_NET_VENDOR_MARVELL is not set
-# CONFIG_NET_VENDOR_MICREL is not set
-# CONFIG_NET_VENDOR_NATSEMI is not set
-# CONFIG_NET_VENDOR_QUALCOMM is not set
-# CONFIG_NET_VENDOR_ROCKER is not set
-# CONFIG_NET_VENDOR_SAMSUNG is not set
-# CONFIG_NET_VENDOR_SEEQ is not set
-# CONFIG_NET_VENDOR_VIA is not set
-# CONFIG_NET_VENDOR_WIZNET is not set
-CONFIG_NO_BOOTMEM=y
-CONFIG_NO_IOPORT_MAP=y
-CONFIG_OF=y
-CONFIG_OF_ADDRESS=y
-CONFIG_OF_EARLY_FLATTREE=y
-CONFIG_OF_FLATTREE=y
-CONFIG_OF_GPIO=y
-CONFIG_OF_IRQ=y
-CONFIG_OF_MDIO=y
-CONFIG_OF_MTD=y
-CONFIG_OF_NET=y
-CONFIG_PAGEFLAGS_EXTENDED=y
-CONFIG_PERF_USE_VMALLOC=y
-CONFIG_PGTABLE_LEVELS=2
-CONFIG_PHYLIB=y
-CONFIG_PPS=y
-CONFIG_PREEMPT=y
-CONFIG_PREEMPT_COUNT=y
-# CONFIG_PREEMPT_NONE is not set
-CONFIG_PREEMPT_RCU=y
-CONFIG_PTP_1588_CLOCK=y
-# CONFIG_RCU_BOOST is not set
-CONFIG_RCU_STALL_COMMON=y
-CONFIG_REGMAP=y
-CONFIG_REGMAP_MMIO=y
-CONFIG_RESET_CONTROLLER=y
-# CONFIG_RTC is not set
-# CONFIG_SCHED_INFO is not set
-# CONFIG_SCSI_DMA is not set
-CONFIG_SERIAL_8250_DEPRECATED_OPTIONS=y
-CONFIG_SERIAL_8250_DW=y
-CONFIG_SERIAL_8250_NR_UARTS=4
-CONFIG_SERIAL_8250_RUNTIME_UARTS=4
-CONFIG_SERIAL_ARC=y
-CONFIG_SERIAL_ARC_CONSOLE=y
-CONFIG_SERIAL_ARC_NR_PORTS=1
-CONFIG_SERIAL_OF_PLATFORM=y
-# CONFIG_SG_SPLIT is not set
-CONFIG_SRCU=y
-CONFIG_STACKTRACE=y
-CONFIG_STMMAC_ETH=y
-CONFIG_STMMAC_PLATFORM=y
-# CONFIG_SUNXI_SRAM is not set
-# CONFIG_SYSTEM_DATA_VERIFICATION is not set
-CONFIG_TICK_CPU_ACCOUNTING=y
-CONFIG_UNINLINE_SPIN_UNLOCK=y
-CONFIG_USB_SUPPORT=y
-CONFIG_ZONE_DMA_FLAG=0
--- /dev/null
+# CONFIG_16KSTACKS is not set
+CONFIG_ARC=y
+CONFIG_ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE=y
+# CONFIG_ARCH_HAS_GCOV_PROFILE_ALL is not set
+# CONFIG_ARCH_HAS_SG_CHAIN is not set
+CONFIG_ARCH_REQUIRE_GPIOLIB=y
+CONFIG_ARCH_SUPPORTS_ATOMIC_RMW=y
+CONFIG_ARC_BUILTIN_DTB_NAME=""
+CONFIG_ARC_CACHE=y
+CONFIG_ARC_CACHE_LINE_SHIFT=5
+CONFIG_ARC_CACHE_PAGES=y
+# CONFIG_ARC_CACHE_VIPT_ALIASING is not set
+# CONFIG_ARC_CANT_LLSC is not set
+# CONFIG_ARC_COMPACT_IRQ_LEVELS is not set
+# CONFIG_ARC_CPU_750D is not set
+CONFIG_ARC_CPU_770=y
+CONFIG_ARC_CURR_IN_REG=y
+CONFIG_ARC_DBG=y
+# CONFIG_ARC_DBG_TLB_MISS_COUNT is not set
+# CONFIG_ARC_DBG_TLB_PARANOIA is not set
+CONFIG_ARC_DW2_UNWIND=y
+# CONFIG_ARC_EMUL_UNALIGNED is not set
+# CONFIG_ARC_FPU_SAVE_RESTORE is not set
+CONFIG_ARC_HAS_DCACHE=y
+# CONFIG_ARC_HAS_DCCM is not set
+CONFIG_ARC_HAS_HW_MPY=y
+CONFIG_ARC_HAS_ICACHE=y
+# CONFIG_ARC_HAS_ICCM is not set
+CONFIG_ARC_HAS_LLSC=y
+CONFIG_ARC_HAS_SWAPE=y
+# CONFIG_ARC_METAWARE_HLINK is not set
+# CONFIG_ARC_MMU_V1 is not set
+# CONFIG_ARC_MMU_V2 is not set
+CONFIG_ARC_MMU_V3=y
+# CONFIG_ARC_PAGE_SIZE_16K is not set
+# CONFIG_ARC_PAGE_SIZE_4K is not set
+CONFIG_ARC_PAGE_SIZE_8K=y
+CONFIG_ARC_PLAT_AXS10X=y
+CONFIG_ARC_PLAT_SIM=y
+# CONFIG_ARC_PLAT_TB10X is not set
+# CONFIG_ARC_UBOOT_SUPPORT is not set
+CONFIG_AXS101=y
+CONFIG_CLKDEV_LOOKUP=y
+CONFIG_CLONE_BACKWARDS=y
+CONFIG_COMMON_CLK=y
+# CONFIG_CPU_BIG_ENDIAN is not set
+CONFIG_CRYPTO_RNG2=y
+CONFIG_CRYPTO_WORKQUEUE=y
+CONFIG_DTC=y
+CONFIG_DWMAC_GENERIC=y
+# CONFIG_DWMAC_SUNXI is not set
+CONFIG_DW_APB_ICTL=y
+CONFIG_GENERIC_ATOMIC64=y
+CONFIG_GENERIC_CLOCKEVENTS=y
+CONFIG_GENERIC_CSUM=y
+CONFIG_GENERIC_FIND_FIRST_BIT=y
+CONFIG_GENERIC_IO=y
+CONFIG_GENERIC_IRQ_CHIP=y
+CONFIG_GENERIC_IRQ_SHOW=y
+CONFIG_GENERIC_SMP_IDLE_THREAD=y
+# CONFIG_GEN_RTC is not set
+CONFIG_GPIOLIB=y
+CONFIG_GPIO_DEVRES=y
+CONFIG_GPIO_DWAPB=y
+CONFIG_GPIO_GENERIC=y
+CONFIG_HAS_DMA=y
+CONFIG_HAS_IOMEM=y
+# CONFIG_HAVE_64BIT_ALIGNED_ACCESS is not set
+# CONFIG_HAVE_ARCH_BITREVERSE is not set
+CONFIG_HAVE_ARCH_KGDB=y
+CONFIG_HAVE_ARCH_TRACEHOOK=y
+# CONFIG_HAVE_BOOTMEM_INFO_NODE is not set
+CONFIG_HAVE_CLK=y
+CONFIG_HAVE_CLK_PREPARE=y
+CONFIG_HAVE_DEBUG_STACKOVERFLOW=y
+CONFIG_HAVE_FUTEX_CMPXCHG=y
+# CONFIG_HAVE_GENERIC_DMA_COHERENT is not set
+CONFIG_HAVE_IOREMAP_PROT=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_PERF_EVENTS=y
+CONFIG_HZ_PERIODIC=y
+CONFIG_INITRAMFS_SOURCE=""
+CONFIG_IRQCHIP=y
+CONFIG_IRQ_DOMAIN=y
+CONFIG_IRQ_WORK=y
+CONFIG_ISA_ARCOMPACT=y
+# CONFIG_ISA_ARCV2 is not set
+CONFIG_KALLSYMS=y
+CONFIG_LIBFDT=y
+CONFIG_LINUX_LINK_BASE=0x80000000
+CONFIG_LZO_COMPRESS=y
+CONFIG_LZO_DECOMPRESS=y
+CONFIG_MDIO_BOARDINFO=y
+CONFIG_MFD_SYSCON=y
+CONFIG_MMC=y
+CONFIG_MMC_DW=y
+# CONFIG_MMC_DW_EXYNOS is not set
+# CONFIG_MMC_DW_K3 is not set
+CONFIG_MMC_DW_PLTFM=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_PLTFM=y
+CONFIG_MODULES_USE_ELF_RELA=y
+CONFIG_NATIONAL_PHY=y
+CONFIG_NEED_PER_CPU_KM=y
+# CONFIG_NET_CADENCE is not set
+CONFIG_NET_PTP_CLASSIFY=y
+# CONFIG_NET_VENDOR_ARC is not set
+# CONFIG_NET_VENDOR_BROADCOM is not set
+# CONFIG_NET_VENDOR_INTEL is not set
+# CONFIG_NET_VENDOR_MARVELL is not set
+# CONFIG_NET_VENDOR_MICREL is not set
+# CONFIG_NET_VENDOR_NATSEMI is not set
+# CONFIG_NET_VENDOR_QUALCOMM is not set
+# CONFIG_NET_VENDOR_ROCKER is not set
+# CONFIG_NET_VENDOR_SAMSUNG is not set
+# CONFIG_NET_VENDOR_SEEQ is not set
+# CONFIG_NET_VENDOR_VIA is not set
+# CONFIG_NET_VENDOR_WIZNET is not set
+CONFIG_NO_BOOTMEM=y
+CONFIG_NO_IOPORT_MAP=y
+CONFIG_OF=y
+CONFIG_OF_ADDRESS=y
+CONFIG_OF_EARLY_FLATTREE=y
+CONFIG_OF_FLATTREE=y
+CONFIG_OF_GPIO=y
+CONFIG_OF_IRQ=y
+CONFIG_OF_MDIO=y
+CONFIG_OF_MTD=y
+CONFIG_OF_NET=y
+CONFIG_PERF_USE_VMALLOC=y
+CONFIG_PGTABLE_LEVELS=2
+CONFIG_PHYLIB=y
+CONFIG_PPS=y
+CONFIG_PREEMPT=y
+CONFIG_PREEMPT_COUNT=y
+# CONFIG_PREEMPT_NONE is not set
+CONFIG_PREEMPT_RCU=y
+CONFIG_PTP_1588_CLOCK=y
+CONFIG_RATIONAL=y
+# CONFIG_RCU_BOOST is not set
+CONFIG_RCU_STALL_COMMON=y
+CONFIG_REGMAP=y
+CONFIG_REGMAP_MMIO=y
+CONFIG_RESET_CONTROLLER=y
+# CONFIG_RTC is not set
+# CONFIG_SCHED_INFO is not set
+# CONFIG_SCSI_DMA is not set
+CONFIG_SERIAL_8250_DEPRECATED_OPTIONS=y
+CONFIG_SERIAL_8250_DW=y
+# CONFIG_SERIAL_8250_FSL is not set
+CONFIG_SERIAL_8250_NR_UARTS=4
+CONFIG_SERIAL_8250_RUNTIME_UARTS=4
+CONFIG_SERIAL_ARC=y
+CONFIG_SERIAL_ARC_CONSOLE=y
+CONFIG_SERIAL_ARC_NR_PORTS=1
+CONFIG_SERIAL_OF_PLATFORM=y
+CONFIG_SRCU=y
+CONFIG_STACKTRACE=y
+CONFIG_STMMAC_ETH=y
+CONFIG_STMMAC_PLATFORM=y
+# CONFIG_SUNXI_SRAM is not set
+CONFIG_TICK_CPU_ACCOUNTING=y
+CONFIG_UNINLINE_SPIN_UNLOCK=y
+CONFIG_USB_SUPPORT=y
+CONFIG_ZONE_DMA_FLAG=0
#size-cells = <1>;
ranges = <0x00000000 0x80000000 0x40000000>;
device_type = "memory";
- reg = <0x00000000 0x20000000>; /* 512MiB */
+ reg = <0x80000000 0x20000000>; /* 512MiB */
};
};
compatible = "snps,axs101", "snps,arc-sdp";
chosen {
- bootargs = "earlycon=uart8250,mmio32,0xe0022000,115200n8 console=ttyS3,115200n8";
+ bootargs = "earlycon=uart8250,mmio32,0xe0022000,115200n8 console=tty0 console=ttyS3,115200n8 consoleblank=0";
};
};
snps,pbl = < 32 >;
clocks = <&apbclk>;
clock-names = "stmmaceth";
+ max-speed = <100>;
};
ehci@0x40000 {
memory {
device_type = "memory";
- reg = <0x00000000 0x10000000>; /* 256M */
+ reg = <0x80000000 0x10000000>; /* 256M */
};
};
+++ /dev/null
-From 271777096a31e76b2ffd750bc44efde9656de857 Mon Sep 17 00:00:00 2001
-From: Alexey Brodkin <abrodkin@synopsys.com>
-Date: Thu, 13 Aug 2015 01:56:02 +0300
-Subject: [PATCH] openwrt: arc - remove dependency on DEVTMPFS
-
-OpenWRT builds initramfs so that it doesn't require DEVTMPFS so dropping
-this dependency. That helps to escape 2 separate kernel rebuilds with
-and without initramfs.
-
-2 builds happen because OpenWRT first builds kernel and later modules.
-When building entire kernel with simple "make" INITRAMFS sets to a real
-value and so was triggering DEVTMPFS selection. Then when building only
-modules with "make modules" command INITRAMFS is zeroed and so kernel
-config was changing that lead to full kernel rebuild.
-
-Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
----
- arch/arc/Kconfig | 2 --
- 1 file changed, 2 deletions(-)
-
---- a/arch/arc/Kconfig
-+++ b/arch/arc/Kconfig
-@@ -12,8 +12,6 @@ config ARC
- select BUILDTIME_EXTABLE_SORT
- select COMMON_CLK
- select CLONE_BACKWARDS
-- # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
-- select DEVTMPFS if !INITRAMFS_SOURCE=""
- select GENERIC_ATOMIC64
- select GENERIC_CLOCKEVENTS
- select GENERIC_FIND_FIRST_BIT
+++ /dev/null
-From 142abc9f7b8860638e39cf3850cf7ba328c26b42 Mon Sep 17 00:00:00 2001
-From: Alexey Brodkin <abrodkin@synopsys.com>
-Date: Sat, 31 Oct 2015 15:58:20 +0300
-Subject: [PATCH] openwrt: arc - add OWRTDTB section
-
-This change allows OpenWRT to patch resulting kernel binary with
-external .dtb.
-
-That allows us to re-use exactky the same vmlinux on different boards
-given its ARC core configurations match (at least cache line sizes etc).
-
-""patch-dtb" searches for ASCII "OWRTDTB:" strign and copies external
-.dtb right after it, keeping the string in place.
-
-Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
----
- arch/arc/kernel/head.S | 10 ++++++++++
- arch/arc/kernel/setup.c | 4 +++-
- arch/arc/kernel/vmlinux.lds.S | 13 +++++++++++++
- 3 files changed, 26 insertions(+), 1 deletion(-)
-
---- a/arch/arc/kernel/head.S
-+++ b/arch/arc/kernel/head.S
-@@ -49,6 +49,16 @@
- 1:
- .endm
-
-+; Here "patch-dtb" will embed external .dtb
-+; Note "patch-dtb" searches for ASCII "OWRTDTB:" string
-+; and pastes .dtb right after it, hense the string precedes
-+; __image_dtb symbol.
-+ .section .owrt, "aw",@progbits
-+ .ascii "OWRTDTB:"
-+ENTRY(__image_dtb)
-+ .fill 0x4000
-+END(__image_dtb)
-+
- .section .init.text, "ax",@progbits
- .type stext, @function
- .globl stext
---- a/arch/arc/kernel/setup.c
-+++ b/arch/arc/kernel/setup.c
-@@ -374,6 +374,8 @@ static inline int is_kernel(unsigned lon
- return 0;
- }
-
-+extern struct boot_param_header __image_dtb;
-+
- void __init setup_arch(char **cmdline_p)
- {
- #ifdef CONFIG_ARC_UBOOT_SUPPORT
-@@ -387,7 +389,7 @@ void __init setup_arch(char **cmdline_p)
- #endif
- {
- /* No, so try the embedded one */
-- machine_desc = setup_machine_fdt(__dtb_start);
-+ machine_desc = setup_machine_fdt(&__image_dtb);
- if (!machine_desc)
- panic("Embedded DT invalid\n");
-
---- a/arch/arc/kernel/vmlinux.lds.S
-+++ b/arch/arc/kernel/vmlinux.lds.S
-@@ -30,6 +30,19 @@ SECTIONS
-
- . = CONFIG_LINUX_LINK_BASE;
-
-+ /*
-+ * In OpenWRT we want to patch built binary embedding .dtb of choice.
-+ * This is implemented with "patch-dtb" utility which searches for
-+ * "OWRTDTB:" string in first 16k of image and if it is found
-+ * copies .dtb right after mentioned string.
-+ *
-+ * Note: "OWRTDTB:" won't be overwritten with .dtb, .dtb will follow it.
-+ */
-+ .owrt : {
-+ *(.owrt)
-+ . = ALIGN(PAGE_SIZE);
-+ }
-+
- _int_vec_base_lds = .;
- .vector : {
- *(.vector)
--- /dev/null
+From adfbf9e6cad93281cffceab078e7f6f2a8e094f9 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin@synopsys.com>
+Date: Thu, 13 Aug 2015 01:56:02 +0300
+Subject: [PATCH 1/2] openwrt: arc - remove dependency on DEVTMPFS
+
+OpenWRT builds initramfs so that it doesn't require DEVTMPFS so dropping
+this dependency. That helps to escape 2 separate kernel rebuilds with
+and without initramfs.
+
+2 builds happen because OpenWRT first builds kernel and later modules.
+When building entire kernel with simple "make" INITRAMFS sets to a real
+value and so was triggering DEVTMPFS selection. Then when building only
+modules with "make modules" command INITRAMFS is zeroed and so kernel
+config was changing that lead to full kernel rebuild.
+
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+---
+ arch/arc/Kconfig | 2 --
+ 1 file changed, 2 deletions(-)
+
+diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
+index 6312f60..a95bab3 100644
+--- a/arch/arc/Kconfig
++++ b/arch/arc/Kconfig
+@@ -12,8 +12,6 @@ config ARC
+ select BUILDTIME_EXTABLE_SORT
+ select COMMON_CLK
+ select CLONE_BACKWARDS
+- # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
+- select DEVTMPFS if !INITRAMFS_SOURCE=""
+ select GENERIC_ATOMIC64
+ select GENERIC_CLOCKEVENTS
+ select GENERIC_FIND_FIRST_BIT
+--
+2.4.3
+
--- /dev/null
+From 690e7f2cad271595ff68cace1c45fb10779bde41 Mon Sep 17 00:00:00 2001
+From: Alexey Brodkin <abrodkin@synopsys.com>
+Date: Fri, 15 Jan 2016 00:34:01 +0300
+Subject: [PATCH 2/2] openwrt: arc - add OWRTDTB section
+
+This change allows OpenWRT to patch resulting kernel binary with
+external .dtb.
+
+That allows us to re-use exactky the same vmlinux on different boards
+given its ARC core configurations match (at least cache line sizes etc).
+
+""patch-dtb" searches for ASCII "OWRTDTB:" strign and copies external
+.dtb right after it, keeping the string in place.
+
+Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
+---
+ arch/arc/kernel/head.S | 10 ++++++++++
+ arch/arc/kernel/setup.c | 4 +++-
+ arch/arc/kernel/vmlinux.lds.S | 13 +++++++++++++
+ 3 files changed, 26 insertions(+), 1 deletion(-)
+
+diff --git a/arch/arc/kernel/head.S b/arch/arc/kernel/head.S
+index 689dd86..51154ae 100644
+--- a/arch/arc/kernel/head.S
++++ b/arch/arc/kernel/head.S
+@@ -49,6 +49,16 @@
+ 1:
+ .endm
+
++; Here "patch-dtb" will embed external .dtb
++; Note "patch-dtb" searches for ASCII "OWRTDTB:" string
++; and pastes .dtb right after it, hense the string precedes
++; __image_dtb symbol.
++ .section .owrt, "aw",@progbits
++ .ascii "OWRTDTB:"
++ENTRY(__image_dtb)
++ .fill 0x4000
++END(__image_dtb)
++
+ .section .init.text, "ax",@progbits
+
+ ;----------------------------------------------------------------
+diff --git a/arch/arc/kernel/setup.c b/arch/arc/kernel/setup.c
+index e1b8744..9481c9d 100644
+--- a/arch/arc/kernel/setup.c
++++ b/arch/arc/kernel/setup.c
+@@ -370,6 +370,8 @@ static inline int is_kernel(unsigned long addr)
+ return 0;
+ }
+
++extern struct boot_param_header __image_dtb;
++
+ void __init setup_arch(char **cmdline_p)
+ {
+ #ifdef CONFIG_ARC_UBOOT_SUPPORT
+@@ -383,7 +385,7 @@ void __init setup_arch(char **cmdline_p)
+ #endif
+ {
+ /* No, so try the embedded one */
+- machine_desc = setup_machine_fdt(__dtb_start);
++ machine_desc = setup_machine_fdt(&__image_dtb);
+ if (!machine_desc)
+ panic("Embedded DT invalid\n");
+
+diff --git a/arch/arc/kernel/vmlinux.lds.S b/arch/arc/kernel/vmlinux.lds.S
+index 894e696..ecfc284 100644
+--- a/arch/arc/kernel/vmlinux.lds.S
++++ b/arch/arc/kernel/vmlinux.lds.S
+@@ -30,6 +30,19 @@ SECTIONS
+
+ . = CONFIG_LINUX_LINK_BASE;
+
++ /*
++ * In OpenWRT we want to patch built binary embedding .dtb of choice.
++ * This is implemented with "patch-dtb" utility which searches for
++ * "OWRTDTB:" string in first 16k of image and if it is found
++ * copies .dtb right after mentioned string.
++ *
++ * Note: "OWRTDTB:" won't be overwritten with .dtb, .dtb will follow it.
++ */
++ .owrt : {
++ *(.owrt)
++ . = ALIGN(PAGE_SIZE);
++ }
++
+ _int_vec_base_lds = .;
+ .vector : {
+ *(.vector)
+--
+2.4.3
+
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