using ltib's u-boot kernel and rootfs to boot board step by step

May 14, 2015

1. Config and build ltib for sabre sdb imx6q

2. Get source code

$ cd path/ltib

$ ./ltib -m prep -p u-boot

$ cd path/ltib

$ ./ltib -m prep -p kernel

3. Modify and build u-boot

$ cd path/ltib/rpm/BUILD/u-boot-2009.08

$ modify inlcude/configs/mx6q_sabresd.h as below

////////////////////////////////////////////////////////////////////

#if 0	//boot from nfs
#define	CONFIG_EXTRA_ENV_SETTINGS					\
		"netdev=eth0\0"						\
		"ethprime=FEC0\0"					\
		"uboot=u-boot.bin\0"			\
		"kernel=uImage\0"				\
		"nfsroot=/opt/eldk/arm\0"				\
		"bootargs_base=setenv bootargs console=ttymxc0,115200\0"\
		"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs "\
			"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0"\
		"bootcmd_net=run bootargs_base bootargs_nfs; "		\
			"tftpboot ${loadaddr} ${kernel}; bootm\0"	\
		"bootargs_mmc=setenv bootargs ${bootargs} ip=dhcp "     \
			"root=/dev/mmcblk0p1 rootwait\0"                \
		"bootcmd_mmc=run bootargs_base bootargs_mmc; "   \
		"mmc dev 3; "	\
		"mmc read ${loadaddr} 0x800 0x2000; bootm\0"	\
		"bootcmd=run bootcmd_net\0"
#endif

#if 1	//boot from mmc and display on lvds1 to LDB-CLAA(1280x420)
#define	CONFIG_EXTRA_ENV_SETTINGS					\
		"netdev=eth0\0"						\
		"ethprime=FEC0\0"					\
		"uboot=u-boot.bin\0"					\
		"kernel=uImage\0"					\
		"nfsroot=/opt/eldk/arm\0"				\
		"bootargs_base=setenv bootargs console=ttymxc0,115200 \0"\
		"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs "\
			"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0"\
		"bootcmd_net=run bootargs_base bootargs_nfs; "		\
			"tftpboot ${loadaddr} ${kernel}; bootm\0"	\
		"bootargs_mmc=setenv bootargs ${bootargs} "     \
			"root=/dev/mmcblk0p1 rootfstype=ext4 rootwait rw lpj=7905280 printk.time=1 verify=no" \
			" ldb=sin1 video=mxcfb0:dev=ldb,LDB-CLAA,if=RGB666,bpp=32 video=mxcfb1:off consoleblank=0 \0"\
		"bootcmd_mmc=run bootargs_base bootargs_mmc; "	\
		"mmc dev 3; "					\
		"mmc read ${loadaddr} 0x800 0x2000; bootm\0"	\
		"bootcmd=run bootcmd_mmc\0"
#endif

#if 0	//boot from mmc and display on twice lvds to LDB-1080P60(1920x720)
#define	CONFIG_EXTRA_ENV_SETTINGS					\
		"netdev=eth0\0"						\
		"ethprime=FEC0\0"					\
		"uboot=u-boot.bin\0"			\
		"kernel=uImage\0"				\
		"nfsroot=/opt/eldk/arm\0"				\
		"bootargs_base=setenv bootargs console=ttymxc0,115200 \0"\
		"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs "\
			"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0"\
		"bootcmd_net=run bootargs_base bootargs_nfs; "		\
			"tftpboot ${loadaddr} ${kernel}; bootm\0"	\
		"bootargs_mmc=setenv bootargs ${bootargs} "     \
			"root=/dev/mmcblk0p1 rootfstype=ext4 rootwait rw lpj=7905280 printk.time=1 verify=no" \
			" ldb=spl0 video=mxcfb0:dev=ldb,LDB-1080P60,if=RGB24,bpp=32 video=mxcfb1:off consoleblank=0 \0"                \
		"bootcmd_mmc=run bootargs_base bootargs_mmc; "   \
		"mmc dev 3; "	\
		"mmc read ${loadaddr} 0x800 0x2000; bootm\0"	\
		"bootcmd=run bootcmd_mmc\0"
#endif

#if 0 //ltib default nfs boot
#define	CONFIG_EXTRA_ENV_SETTINGS \
		"netdev=eth0\0" \
		"ethprime=FEC0\0" \
		"uboot=u-boot.bin\0" \
		"kernel=uImage\0" \
		"nfsroot=/opt/eldk/arm\0" \
		"bootargs_base=setenv bootargs console=ttymxc0,115200\0" \
		"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs " \
			"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0" \
		"bootcmd_net=run bootargs_base bootargs_nfs; " \
			"tftpboot ${loadaddr} ${kernel}; bootm\0" \
		"bootargs_mmc=setenv bootargs ${bootargs} ip=dhcp " \
			"root=/dev/mmcblk0p1 rootwait\0" \
		"bootcmd_mmc=run bootargs_base bootargs_mmc; " \
		"mmc dev 3; " \
		"mmc read ${loadaddr} 0x800 0x2000; bootm\0"	\
		"bootcmd=run bootcmd_net\0"                             \

#else // for mmc boot

#define	CONFIG_EXTRA_ENV_SETTINGS \
	"netdev=eth0\0" \
	"ethprime=FEC0\0" \
	"uboot=u-boot.bin\0" \
	"kernel=uImage\0" \
	"nfsroot=/opt/eldk/arm\0" \
	"bootargs_base=setenv bootargs console=ttymxc0,115200 \0" \
	"bootargs_nfs=setenv bootargs ${bootargs} root=/dev/nfs " \
		"ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp\0" \
	"bootcmd_net=run bootargs_base bootargs_nfs; " \
		"tftpboot ${loadaddr} ${kernel}; bootm\0" \
	"bootargs_mmc=setenv bootargs ${bootargs} " \
		"root=/dev/mmcblk0p1 rootfstype=ext4 rootwait rw lpj=7905280 printk.time=1 verify=no" \
		" ldb=spl0 video=mxcfb0:dev=ldb,LDB-1080P60,if=RGB24,bpp=32 video=mxcfb1:off consoleblank=0 \0" \
	"bootcmd_mmc=run bootargs_base bootargs_mmc; " \
	"mmc dev 3; " \
	"mmc read ${loadaddr} 0x800 0x2000; bootm\0" \
	"bootcmd=run bootcmd_mmc\0" \

#endif

/////////////////////////////////////////////////////////////////////////

$ export ARCH=arm
$ export CROSS_COMPILE=/opt/gcc-linaro-arm-linux-gnueabi-2012.04-20120426_linux/bin/arm-linux-gnueabi-

$ make mx6q_sabresd_config

$ make

////////////////////////////Note/////////////////////////////////

uboot mmc read/write命令用法

mmc read用来读取mmc内容到内存，

mmc write用来写入内存内容到mmc中

具体用法,

mmc read <device num> addr blk# cnt [partition]

mmc write <device num> addr blk# cnt [partition]

mmc list

device num是mmc的设备号，可以通过mmc list查询

addr是内存地址

blk# 是mmc内的块号

cnt 块数目 ( 块大小为512Byte )

使用范例：

mmc write 2 0x90000000 0x600 0x10

把内存0x90000000开始，长度为16x512大小的数据，写入到第2个mmc设备块偏移位置为0x600处

mmc read 2 0x90000000 0x600 0x10

把第二个mmc设备块偏移为0x600处开始，长度为16x512大小的数据，读出到内存0x90000000处
///////////////////////////////////////////////

4. Modify and build kernel

$ cd path/ltib/rpm/BUILD/linux-3.0.35

$ export ARCH=arm

$ export CROSS_COMPILE=/opt/gcc-linaro-arm-linux-gnueabi-2012.04-20120426_linux/bin/arm-linux-gnueabi-

$ make imx6_defconfig

$ make uImage

5. Reduce rootfs

$ cd path/ltib/rootfs

$ add post_build.sh
##########################################
#!/bin/sh
cd dev
sudo mknod null c 1 3
sudo chmod 666 null

sudo mknod console c 5 1
sudo chmod 777 console

for i in 0 1 2 3 4 5 6 7 8 9 10 11 12; do sudo mknod fb$i c 29 $i; done

sudo mknod mxc_ipu c 253 0
sudo mknod mxc_vpu c 252 0
sudo mknod ttymxc0 c 207 16
sudo mknod video0 c 81 0
sudo mknod galcore c 199 0

cd ..
sudo rm -rf unit_tests
sudo rm -rf boot
sudo rm -rf opt/fsl_samples
sudo rm -rf opt/viv_samples
sudo rm -rf share

sudo rm -rf usr/include
sudo rm -rf usr/info
sudo rm -rf usr/man
sudo rm -rf usr/src
sudo rm -rf usr/share

sudo rm -rf var/spool
sudo rm -rf var/ftp
sudo rm -rf var/log
sudo rm -rf var/run
sudo rm -rf var/mail
sudo rm -rf var/lock
sudo rm -rf var/lib
sudo rm -rf var/www
###############################################

$ ./post_build.sh

$ sudo tar -cjvf ../rootfs.tar.bz2 ./*

6. Flash u-boot.bin, uImage and rootfs.tar.bz2 to board mmc

7. Reset board. Done!