Merge branch 'tiny4412-nxt' into all-in-one

Author: 54shady

tiny4412/README.md

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+# kernel_drivers_examples
+
+Codes test on the kernel version below
+
+	4.4.0
+
+# tiny4412_devicetree
+
+tiny4412内核移植(支持device tree)
+
+[参考文章](http://www.cnblogs.com/pengdonglin137/tag/TINY4412/)
+
+内核版本：Linux-4.4.0
+
+u-boot版本：友善之臂自带的 U-Boot 2010.12
+
+busybox版本：busybox 1.25
+
+交叉编译工具链arm-none-linux-gnueabi-gcc:[下载地址](https://launchpad.net/gcc-arm-embedded/+download)
+
+gcc version 4.8.3 20140320 (prerelease) (Sourcery CodeBench Lite 2014.05-29)
+
+## 说明
+
+4412>	表示在开发板上执行
+
+PC>		表示在开发主机上执行
+
+## U-boot
+
+代码下载
+
+	git clone https://github.com/54shady/uboot_tiny4412.git --depth=1
+
+配置编译
+
+	mkdir out
+	make O=out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- tiny4412_config
+	make O=out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- -j8
+	make ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- -C sd_fuse
+
+烧写uboot到SD卡里(sdb)
+
+	cd sd_fuse/tiny4412/
+	./sd_fusing.sh /dev/sdb
+
+uboot下对SD卡进行分区
+
+	fdisk -c 0 608 2057 520
+
+uboot下格式化FAT分区
+
+	fatformat mmc 0:1
+
+## U-Boot环境变量
+
+EMMC或SD卡里文件系统启动
+
+	set bootcmd "movi read kernel 0 0x40600000; mmc read 0 0x41000000 0x3421 0x2800; mmc read 0 0x42000000 0x5c21 0x800; bootm 0x40600000 0x41000000 0x42000000"
+
+	setenv bootargs 'root=/dev/ram0 rw rootfstype=ext4 console=ttySAC0,115200 ethmac=1C:6F:65:34:51:7E init=/linuxrc'
+
+nfs网络文件系统启动
+
+	set bootcmd "movi read kernel 0 0x40600000; mmc read 0 0x42000000 0x5c21 0x800; bootm 0x40600000 - 0x42000000"
+
+	setenv bootargs 'root=/dev/nfs rw nfsroot=192.168.1.100:/home/zeroway/android/src/rootfs_for_tiny4412/rootfs ethmac=1C:6F:65:34:51:7E ip=192.168.1.230:192.168.1.100:192.168.1.1:255.255.255.0::eth0:off console=ttySAC0,115200 init=/linuxrc'
+
+## Kernel
+
+配置
+
+	make O=out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- exynos_defconfig
+
+编译内核
+
+	make O=out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- uImage -j8 LOADADDR=0x40008000
+
+编译模块
+
+	make O=out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- modules -j8
+
+编译设备树
+
+	make O=out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi- dtbs -j8
+
+## ramdisk制作
+
+使用脚本make_ramdiskimage.sh或手工执行
+
+```shell
+rm -rvf ramdisk*
+sudo dd if=/dev/zero of=ramdisk bs=1k count=8192
+sudo mkfs.ext4 -F ramdisk
+sudo mkdir -p ./initrd
+sudo mount -t ext4 ramdisk ./initrd
+sudo cp rootfs/* ./initrd -ravf
+sudo mknod initrd/dev/console c 5 1
+sudo mknod initrd/dev/null c 1 3
+sudo umount ./initrd
+sudo gzip --best -c ramdisk > ramdisk.gz
+sudo mkimage -n "ramdisk" -A arm -O linux -T ramdisk -C gzip -d ramdisk.gz ramdisk.img
+```
+
+## DNW烧写
+
+block size = 512 byte(0x200)
+
+### 下载内核(uImage)
+
+下载内核到DDR里
+
+4412>
+
+	dnw 0x40600000
+
+PC>
+
+	dnw uImage
+
+将DDR里的内核写入EMMC
+
+写起始地址 0x421
+
+写大小0x3000
+
+0x3000 * 0x200 / 0x400 / 0x400 = 6M(大于内核大小即可)
+
+4412>
+
+	mmc write 0 0x40600000 0x421 0x3000
+
+将写入EMMC的文件读出来对比(测试烧写是否正确)
+
+	mmc read 0 0x41600000 0x421 0x3000
+	cmp.b 0x41600000 0x40600000 0x3000
+
+### 下载文件系统(ramdisk.img)
+
+下载文件统到DDR里
+
+写起始地址 0x3421
+
+写大小0x2800
+
+0x2800 * 0x200 / 0x400 / 0x400 = 5M(大于文件系统大小即可)
+
+4412>
+
+	dnw 0x41000000
+
+PC>
+
+	dnw ramdisk.img
+
+将DDR里的文件系统写入EMMC
+
+4412>
+
+	mmc write 0 0x41000000 0x3421 0x2800
+
+将写入EMMC的文件读出来对比(测试烧写是否正确)
+
+
+	mmc read 0 0x41600000 0x3421 0x2800
+	cmp.b 0x41600000 0x41000000 0x2800
+
+### 下载设备树(exynos4412-tiny4412.dtb)
+
+下载设备树到DDR里
+
+写起始地址 0x5c21
+
+写大小0x500
+
+0x800 * 0x200 / 0x400 / 0x400 = 1M(大于设备树大小即可)
+
+4412>
+
+	dnw 0x42000000
+
+PC>
+
+	dnw exynos4412-tiny4412.dtb
+
+将DDR里的设备树写入EMMC
+
+4412>
+
+	mmc write 0 0x42000000 0x5c21 0x800
+
+将写入EMMC的文件读出来对比(测试烧写是否正确)
+
+
+	mmc read 0 0x40600000 0x7530 0x800
+	cmp.b 0x40600000 0x42000000 0x800
+
+## bootm启动
+
+bootm + uImage + ramdisk + dtb
+
+	bootm 0x40600000 0x41000000 0x42000000
+
+## fastboot烧写镜像
+
+### 烧写内核
+
+4412>
+
+	fastboot
+
+PC>
+
+	fastboot flash kernel uImage
+
+### 烧写文件系统
+
+4412>
+
+	fastboot
+PC>
+
+	fastboot flash ramdisk ramdisk.img
+
+## USB
+
+### 网卡配置(dm9621)
+
+BUG
+需要冷启动才能正常使用,估计是复位异常,待排查
+
+busybox ifconfig eth0 192.168.1.200 up
+
+### 测试U盘挂载
+
+	mount -o loop /dev/sda4 /mnt/
+
+## 挂载网络文件系统
+
+	mount -t nfs -o nolock,vers=2 192.168.1.100:/home/zeroway/android/src/rootfs_for_tiny4412/rootfs /mnt/
+
+## 驱动实例
+
+下载代码
+
+	git clone https://github.com/54shady/kernel_drivers_examples.git -b tiny4412 --depth=1
+
+[中断方式按键驱动](./debug/buttons/README.md)
+
+[LED驱动](./debug/leds/README.md)

tiny4412/debug/buttons/Makefile

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+# Makefile
+# Comment/uncomment the following line to disable/enable debugging
+# DEBUG = y
+
+# Usage
+# make KERNEL_DIR=/home/zeroway/github/4412dt/new_kernel/linux-4.4 KERNEL_BUID_OUTPUT=/home/zeroway/github/4412dt/new_kernel/linux-4.4/out ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabi-
+
+# Add your debugging flag (or not) to CFLAGS
+ifeq ($(DEBUG),y)
+DEBFLAGS = -O -g -DSCULL_DEBUG # "-O" is needed to expand inlines
+else
+DEBFLAGS = -O2
+endif
+
+obj-m := buttons.o
+KERNEL_DIR ?= /lib/modules/$(shell uname -r)/build
+KERNEL_BUID_OUTPUT ?=$(KERNEL_DIR)
+CC = $(CROSS_COMPILE)gcc
+LD = $(CROSS_COMPILE)ld
+PWD := $(shell pwd)
+
+modules:
+	$(MAKE) -C $(KERNEL_DIR) M=$(PWD) O=$(KERNEL_BUID_OUTPUT) modules
+
+clean:
+	rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions modules.order Module.symvers
+
+depend .depend dep:
+	$(CC) $(CFLAGS) -M *.c > .depend
+
+ifeq (.depend,$(wildcard .depend))
+include .depend
+endif

tiny4412/debug/buttons/README.md

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+# 按键驱动
+
+## 硬件连接
+
+当按键按下后电平由高变低
+
+![button1](./button1.png)
+
+![button2](./button2.png)
+
+## 使用方法
+
+在主设备树文件里包含下面的文件
+
+	#include "buttons.dtsi"
+
+## 测试
+
+按下每个按键后会打印日志