iTOP4412内核烧写不断重启问题

   在学习ITOP4412开发板驱动教程第6章时，要添加hello_ctl设备驱动到内核，对源码配置之后，重新编译内核并烧写到开发板中，开发板会出现不断重启的现象，超级终端打印信息如下：

OK
  
U-Boot 2010.03 (Mar 19 2018 - 23:52:03) for iTOP-4412 Android
                                                             
        APLL = 1000MHz, MPLL = 800MHz
        ARM_CLOCK = 1000MHz          
PMIC:   S5M8767(VER5.0)    
Board:  iTOP-4412      
DRAM:    1 GB    
MMC:   max_emmc_clock:40 MHZ
Set CLK to 400 KHz          
EMMC CLOCK OUTPUT:: 400KHz -[div:50]
response timeout error : 00000104 cmd 8
response timeout error : 00000104 cmd 55
max_emmc_clock:40 MHZ                   
Input CLK [ 50 MHz] is higher than limit [40 MHZ]
Set CLK to 40000 KHz                             
EMMC clock output: 40000 KHz
max_emmc_clock:40 MHZ       
Input CLK [ 50 MHz] is higher than limit [40 MHZ]
Set CLK to 40000 KHz                             
EMMC clock output: 40000 KHz
MMC0:   7456 MB             
SD sclk_mmc is 400K HZ
raise: Signal # 8 caught
raise: Signal # 8 caught
MMC1:   0 MB            
0 MB        
*** Warning - using default environment
                                       
In:    serial
Out:   serial
Err:   serial
eMMC OPEN Success.!!
                        !!!Notice!!!
!You must close eMMC boot Partition after all image writing!
!eMMC boot partition has continuity at image writing time.! 
!So, Do not close boot partition, Before, all images is written.!
                                                                 
MMC read: dev # 0, block # 48, count 16 ...16 blocks read: OK
eMMC CLOSE Success.!!                                        
                     

Checking Boot Mode ... EMMC4.41
SYSTEM ENTER NORMAL BOOT MODE  
Hit any key to stop autoboot:  0 
reading kernel.. 1120, 12288     
MMC read: dev # 0, block # 1120, count 12288 ...12288 blocks read: OK
completed                                                            
reading RFS.. 13408, 2048 
MMC read: dev # 0, block # 13408, count 2048 ...2048 blocks read: OK
completed                                                           
Boot with zImage
Wrong Ramdisk Image Format
[err] boot_get_ramdisk    
                      
Starting kernel ...
                   

分析：ramdisk-uboot.img和system.img文件都是迅为已经提供好的文件，问题应该是出在zImage文件上。
解决办法：执行make menuconfig后，会生成一个.config文件，如果直接编译，则会生成错误zImage，需要用config_for_linux_scp_elite（精英板）进行替换：执行
cp config_for_linux_scp_elite .config,然后再进行编译，烧写。
烧录完之后，执行ls /sys/devices/platform/，可以查看到新注册的 hello 设备

Please press Enter to activate this console. 
[[email protected]]# 
[[email protected]]# 
[[email protected]]# 
[[email protected]]# ls /sys/devices/platform/
adc_ctl                 s3c-pl330.1             s5pv210-uart.3
alarm                   s3c-pl330.2             samsung-audio
android_pmem.0          s3c-sdhci.2             samsung-audio-idma
android_pmem.1          s3c-sdhci.3             samsung-i2s.0
arm-pmu.0               s3c-usbgadget           samsung-i2s.4
bt-sysfs                s3c2410-wdt             samsung-keypad
buzzer_ctl              s3c2440-i2c.1           samsung-kmsg
dw_mmc                  s3c2440-i2c.3           samsung-pd.0
exynos-busfreq          s3c2440-i2c.4           samsung-pd.1
exynos-usb-switch       s3c2440-i2c.5           samsung-pd.2
exynos4412-adc          s3c2440-i2c.7           samsung-pd.5
gpio-keys               s3c24xx-pwm.1           samsung-pd.6
hello_ctl               s3c64xx-rtc             samsung-pd.7
i2c-gpio.0              s3c64xx-spi.2           samsung-rp
ion-exynos              s5p-ehci                serial8250
leds                    s5p-fimg2d              si_gps
max485_ctl              s5p-pmic                snd-soc-dummy
mt3326-gps              s5p-sysmmu.15           soc-audio
power                   s5p-tvout-cec           switch-gpio.0
power.0                 s5p-tvout-hpd           tc4-regulator-consumer
reg-dummy               s5pv210-uart.0          uevent
regulatory.0            s5pv210-uart.1          wlan_ar6000_pm_dev.1
relay_ctl               s5pv210-uart.2