开发环境：win10 64位?+ VMware12 + Ubuntu14.04 32位

1、下载、解压内核

linux-4.4.tar.gz 

2、配置

　　1）配置开发板类型及指定交叉编译链

diff --git a/arch/arm/boot/dts/exynos4412-tiny4412.dts b/arch/arm/boot/dts/exyno
index 4840bbd..048ae67 100644
--- a/arch/arm/boot/dts/exynos4412-tiny4412.dts
+++ b/arch/arm/boot/dts/exynos4412-tiny4412.dts
@@ -21,6 +21,7 @@
 
 ESCOD
index 70dea02..42b0d63 100644
--- a/Makefile
+++ b/Makefile
@@ -248,8 +248,11 @@ SUBARCH := $(shell uname -m | sed -e s/i.86/x86/ -e s/x86_6
 # "make" in the configured kernel build directory always uses that.
 # Default value for CROSS_COMPILE is not to prefix executables
 # Note: Some architectures assign CROSS_COMPILE in their arch/*/Makefile
-ARCH           ?= $(SUBARCH)
-CROSS_COMPILE  ?= $(CONFIG_CROSS_COMPILE:"%"=%)
+#ARCH          ?= $(SUBARCH)
+#CROSS_COMPILE ?= $(CONFIG_CROSS_COMPILE:"%"=%)
+
+ARCH           ?= arm
+CROSS_COMPILE  ?= /usr/local/ARM-toolchian/gcc-linaro-6.1.1-2016.08-i686_arm-linux-gnueabi/bin/arm-linux-gnueabi-
 
 # Architecture as present in compile.h
 UTS_MACHINE    := $(ARCH)

　　2）修改设备树

diff --git a/arch/arm/boot/dts/exynos4412-tiny4412.dts b/arch/arm/boot/dts/exyno
index 4840bbd..048ae67 100644
--- a/arch/arm/boot/dts/exynos4412-tiny4412.dts
+++ b/arch/arm/boot/dts/exynos4412-tiny4412.dts
@@ -21,6 +21,7 @@
 
        chosen {
                stdout-path = &serial_0;
+        bootargs="root=/dev/ram0 rw rootfstype=ext4 console=ttySAC0,115200 init=/linuxrc earlyprintk";

        };
 
        memory {
@@ -78,7 +79,8 @@
        bus-width = <4>;
        pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_bus4>;
        pinctrl-names = "default";
-       status = "okay";
+   /* status = "okay";*/
+    status = "disabled";
 };
 
 &serial_0 {

3,配置内核支持Ramdisk

make menuconfig

File systems --->;

    <*> Second extended fs support

Device Drivers

    SCSI device support --->;

        <*> SCSI disk support

    Block devices --->;

        <*>RAM block device support

        (16)Default number of RAM disks

        (8192) Default RAM disk size (kbytes) (修改为8M)

General setup --->;

    [*] Initial RAM filesystem and RAM disk (initramfs/initrd) support

这个exynos的默认配置就已经支持了。

4.配置内核支持Tmpfs

$ make menuconfig

File systems --->;

   Pseudo filesystems --->

        [*] Virtual memory file system support (former shm fs)

        [*] Tmpfs POSIX Access Control Lists
这个exynos的默认配置也已经支持了。

5.编译内核

[email?protected]:/home/arm/linux-4.4# cat build.sh 
#!/bin/bash

echo "---------------"
echo "rm ./ uImage and dtb"
rm uImage exynos4412-tiny4412.dtb

echo "make"
make uImage LOADADDR=0x40007000 -j4

echo "make dtb"
make dtbs

echo "backup config"
cp .config tiny4412_defconfig

echo "copy uImage"
cp arch/arm/boot/uImage ./

echo "copy dtb"
cp arch/arm/boot/dts/exynos4412-tiny4412.dtb ./

echo "over"

编写脚本。执行，烧写

即可初步启动kernel

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问题：启动后如果显示文件太多会出现

dma-pl330 12680000.pdma: Reset Channel-1 CS-20000f FTC-20000
[ 1573.447654] dma-pl330 12680000.pdma: Reset Channel-1 CS-20000f FTC-20000

参考：https://blog.csdn.net/sinat_20006769/article/details/79060779

说是DMA驱动的问题，按照介绍取消dma-pl330后，kernel无法启动

参考：https://blog.csdn.net/hyyoxhk/article/details/83305367

修改arch/arm/boot/dts/exynos4412-tiny4412.dts中，serial_0的dmas导致卡死，serial_2的dmas无效果

参考：https://blog.csdn.net/qq_25370227/article/details/84891632

是uboot中TrustZone造成，目前未尝试

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整体参考：

https://www.cnblogs.com/pengdonglin137/p/5143516.html

https://blog.csdn.net/sinat_20006769/column/info/19139