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提问：
1. 怎样修改linux代码，修改后怎么用git管理。
2. 怎样编译修改后的代码，只编译和install修改的部分，加快速度。
3. bitbake的clean都clean了哪些内容，为什么源码不见了。
4. 自己的修改的代码怎么和fsl的修改合并在一起。
5. 烧写.sdcard没问题，但从tftp启动image就出错。
6. 开发版编译的是什么版本，是fsl-image-gui吗？
7. 我是做驱动开发的，怎么调试单个模块？比如usb serial module驱动3G模块。
8. 写了一个应用程序，在fsl的image上可以正常运行，我自己编译了一个minimal的内核，却提示不能够执行。
9. 通过eclipse插件，新建一个Yocto project，我的main.c文件想调用其他文件的*.c实现，发现总是引用不成功，不知道是插件的问题还是哪儿用错了。
10. 直接到内核代码处执行make menuconfig和执行bitbake -C menuconfig "module"有啥不同吗
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一 u-boot可以通过tftp正常加载image和dbt文件，但显示文件错误
===============================================
U-Boot 2015.04-imx_v2015.04_3.14.38_6ul_ga+g5d63276 (Aug 18 2015 - 21:32:01)
CPU: Freescale i.MX6UL rev1.0 at 396 MHz
CPU: Temperature 38 C
Reset cause: POR
Board: MX6UL 14x14 EVK
I2C: ready
DRAM: 512 MiB
MMC: FSL_SDHC: 0, FSL_SDHC: 1
Display: TFT43AB (480x272)
Video: 480x272x24
In: serial
Out: serial
Err: serial
switch to partitions #0, OK
mmc1 is current device
Net: FEC1
Normal Boot
Hit any key to stop autoboot: 0
BOOTP broadcast 1
DHCP client bound to address 192.168.0.105 (3 ms)
Using FEC1 device
TFTP from server 192.168.0.107; our IP address is 192.168.0.105
Filename 'zImage'.
Load address: 0x80800000
Loading: #################################################################
#################################################################
#################################################################
#################################################################
#################################################################
#################################################################
########################
885.7 KiB/s
done
Bytes transferred = 6070432 (5ca0a0 hex)
BOOTP broadcast 1
DHCP client bound to address 192.168.0.105 (3 ms)
Using FEC1 device
TFTP from server 192.168.0.107; our IP address is 192.168.0.105
Filename 'zImage-imx6ul-14x14-evk.dtb'.
Load address: 0x83000000
Loading: ###
364.3 KiB/s
done
Bytes transferred = 34342 (8626 hex)
Kernel image @ 0x80800000 [ 0x000000 - 0x5ca0a0 ]
Wrong Ramdisk Image Format
Ramdisk image is corrupt or invalid
-----------------------------------------
baudrate=115200
boot_fdt=try
bootargs=console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=${serverip}:/nfsroot/rootfs,v3,tcp
bootargsset=setenv bootargs ${consoleinfo} ${rootfsinfo}
bootcmd=run bootcmd_net
bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr};
bootcmd_net=run rootfsinfo bootargsset; dhcp ${image}; dhcp ${fdt_addr} ${fdt_file}; bootz ${loadaddr} - ${fdt_addr}
bootdelay=3
bootfile=zImage-imx6ul-14x14-evk.dtb
bootscript=echo Running bootscript from mmc ...; source
console=ttymxc0
consoleinfo=console=ttymxc0,115200
dnsip=202.96.134.33
ethact=FEC1
ethaddr=00:04:9f:03:e9:1d
ethprime=FEC
fdt_addr=0x83000000
fdt_file=zImage-imx6ul-14x14-evk.dtb
fdt_high=0xffffffff
fileaddr=83000000
filesize=8626
gatewayip=192.168.0.1
image=zImage
initrd_addr=0x83800000
initrd_high=0xffffffff
ip_dyn=yes
ipaddr=192.168.0.105
loadaddr=0x80800000 setenv fdt_addr 0x83000000
loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script};
loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file}
loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image}
mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.i
mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot}
mmcautodetect=yes
mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadadd;
mmcdev=1
mmcpart=1
mmcroot=/dev/mmcblk1p2 rootwait rw
netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp
netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${;
netmask=255.255.255.0
panel=TFT43AB
rootfsinfo=root=/dev/nfs ip=dhcp nfsroot=${serverip}:/nfsroot/rootfs,v3,tcp
script=boot.scr
serverip=192.168.0.107
Environment size: 2488/8188 bytes
=>
=============================================================================================================
无法启动网络
root@imx6ulevk:/usr/games# ifconfig eth0 up ifconfig: SIOCSIFFLAGS: No such device
root@imx_mfgtools_nogpu:~# dmesg | grep eth -C 5 bio: create slab <bio-0> at 0 mxs-dma 1804000.dma-apbh: initialized can-3v3: 3300 mV VSD_3V3: 3300 mV gpio_dvfs: 1300 <--> 1400 mV at 1400 mV i2c-core: driver [max17135] using legacy suspend method i2c-core: driver [max17135] using legacy resume method SCSI subsystem initialized libata version 3.00 loaded. usbcore: registered new interface driver usbfs usbcore: registered new interface driver hub usbcore: registered new device driver usb -- fsl-quadspi 21e0000.qspi: QuadSPI SPI NOR flash driver spi_gpio spi4.14: gpio-miso property not found, switching to no-rx mode CAN device driver interface flexcan 2090000.can: device registered (reg_base=a0968000, irq=142) flexcan 2094000.can: device registered (reg_base=a0970000, irq=143) 20b4000.ethernet supply phy not found, using dummy regulator pps pps0: new PPS source ptp0 libphy: fec_enet_mii_bus: probed fec 20b4000.ethernet eth0: registered PHC device 0 2188000.ethernet supply phy not found, using dummy regulator pps pps1: new PPS source ptp1 fec 2188000.ethernet eth1: registered PHC device 1 ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver ehci-mxc: Freescale On-Chip EHCI Host driver usbcore: registered new interface driver usb-storage usbcore: registered new interface driver usb_ehset_test 2184800.usbmisc supply vbus-wakeup not found, using dummy regulator -- hub 1-0:1.0: 1 port detected mousedev: PS/2 mouse device common for all mice input: 20cc000.snvs-pwrkey as /devices/soc0/soc.0/2000000.aips-bus/20cc000.snvs-pwrkey/input/input0 snvs_pwrkey 20cc000.snvs-pwrkey: i.MX snvs powerkey probed input: iMX6UL TouchScreen Controller as /devices/virtual/input/input1 i2c-core: driver [isl29023] using legacy suspend method i2c-core: driver [isl29023] using legacy resume method input: FreescaleAccelerometer as /devices/virtual/input/input2 fxls8471 device driver probe successfully snvs_rtc 20cc034.snvs-rtc-lp: rtc core: registered 20cc034.snvs-rtc-lp as rtc0 i2c /dev entries driver IR NEC protocol handler initialized -- 0-000e supply vdd not found, using dummy regulator 0-000e supply vddio not found, using dummy regulator mag3110 0-000e: check mag3110 chip ID input: mag3110 as /devices/virtual/input/input3 mag3110 0-000e: mag3110 is probed i2c-core: driver [mag3110] using legacy suspend method i2c-core: driver [mag3110] using legacy resume method imx2-wdt 20bc000.wdog: IMX2+ Watchdog Timer enabled. timeout=60s (nowayout=0) Bluetooth: HCI UART driver ver 2.2 Bluetooth: HCI H4 protocol initialized Bluetooth: HCI BCSP protocol initialized Bluetooth: HCIATH3K protocol initialized
=============================================================================================================
正常，出厂状态下的print信息
baudrate=115200 boot_fdt=try bootcmd=mmc dev ${mmcdev};mmc dev ${mmcdev}; if mmc rescan; then if run loadbootscript; then run bootscript; else if run loadimage; then run mi bootcmd_mfg=run mfgtool_args;bootz ${loadaddr} ${initrd_addr} ${fdt_addr}; bootdelay=3 bootscript=echo Running bootscript from mmc ...; source console=ttymxc0 ethact=FEC1 ethaddr=00:04:9f:03:fb:92 ethprime=FEC fdt_addr=0x83000000 fdt_file=imx6ul-14x14-evk.dtb fdt_high=0xffffffff image=zImage initrd_addr=0x83800000 initrd_high=0xffffffff ip_dyn=yes loadaddr=0x80800000 loadbootscript=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${script}; loadfdt=fatload mmc ${mmcdev}:${mmcpart} ${fdt_addr} ${fdt_file} loadimage=fatload mmc ${mmcdev}:${mmcpart} ${loadaddr} ${image} mfgtool_args=setenv bootargs console=${console},${baudrate} rdinit=/linuxrc g_mass_storage.stall=0 g_mass_storage.removable=1 g_mass_storage.i mmcargs=setenv bootargs console=${console},${baudrate} root=${mmcroot} mmcautodetect=yes mmcboot=echo Booting from mmc ...; run mmcargs; if test ${boot_fdt} = yes || test ${boot_fdt} = try; then if run loadfdt; then bootz ${loadadd; mmcdev=1 mmcpart=1 mmcroot=/dev/mmcblk1p2 rootwait rw netargs=setenv bootargs console=${console},${baudrate} root=/dev/nfs ip=dhcp nfsroot=${serverip}:${nfsroot},v3,tcp netboot=echo Booting from net ...; run netargs; if test ${ip_dyn} = yes; then setenv get_cmd dhcp; else setenv get_cmd tftp; fi; ${get_cmd} ${; panel=TFT43AB script=boot.scr Environment size: 2042/8188 bytes
在自己的image上不能执行的文件属性：
summer@summer-ThinkPad-X230:/nfsroot/workspace/hello$ file hello hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux.so.3, for GNU/Linux 2.6.32, BuildID[sha1]=3801ca19875a1f217a660eab159099fddbd90974, not stripped
tony提供的可以执行的文件
summer@summer-ThinkPad-X230:/nfsroot/tonys$ file hello
hello: ELF 32-bit LSB executable, ARM, EABI5 version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-armhf.so.3, for GNU/Linux 2.6.32, BuildID[sha1]=312402ec4e4e472214fbf65068ac3a5ebcb24919, stripped
=============================================================================================================
问题：
ERROR: User requested feature sdl
configure was not able to find it.
Install SDL devel
解决：
sudo apt-get install libsdl1.2-dev