Amlogic 8726 升级相关介绍.docxVIP

Amlogic 8726升级相关介绍Amlogic uboot启动命令执行顺序：正常启动下：reboot_mode=charging1. preboot=get_rebootmode; clear_rebootmode; echo reboot_mode=${reboot_mode}; if test ${reboot_mode} = usb_burning; then tiny_usbtool 20000; fi; run upgrade_check; run switch_bootmode2. bootcmd=run nandboot3. nandboot=echo Booting from nand ...;run?vdacswitchconfig;run?nandargs;nand read boot ${loadaddr} 0 600000;hdcp prefetch nand;bootm;run recoveryvdacswitchconfig=if test ${cvbsenable} = true; then setenv vdacswitchmode cvbs;else if test ${cvbsenable} = false;then setenv vdacswitchmode component;fi;finandargs=run?cvbscheck; nand read logo 00 800000;unpackimg 0 cp ${bootup_offset} 0${bootup_size}; setenv bootargs root=/dev/cardblksd2 rw rootfstype=ext3 rootwait init=/init console=ttyS0,115200n8 logo=osd1,0${outputtemp},full androidboot.resolution=${outputmode} nohlt vmalloc=256m mem=1024m a9_clk_max=1512000000 vdachwswitch=${vdacswitchmode}cvbscheck=setenv outputtemp ${outputmode};if test ${outputmode} = 480i; then if test ${cvbsenable} = true; then setenv outputtemp 480cvbs;fi;fi; if test ${outputmode} = 576i; then if test ${cvbsenable} = true; then setenv outputtemp 576cvbs;fi;fi升级模式下：reboot_mode=update1. preboot=get_rebootmode; clear_rebootmode; echo reboot_mode=${reboot_mode}; if test ${reboot_mode} = usb_burning; then tiny_usbtool 20000; fi; run upgrade_check; run updatekey_or_not; run switch_bootmode2. upgrade_check=if itest ${upgrade_step} == 1; then defenv_without reboot_mode;setenv upgrade_step 2; save; fi3. updatekey_or_not=saradc open 4;if saradc get_in_range 0x0 0x50 ;then msleep 500;if saradc get_in_range 0x0 0x50; then run?update; fi; fiupdate=if mmcinfo; then if fatload mmc 0 ${loadaddr} aml_autoscript; then autoscr ${loadaddr}; fi;fi;if usb start; then if fatload usb 0 ${loadaddr} aml_autoscript; then autoscr ${loadaddr}; fi;fi;run?recovery4. switch_bootmode=if test ${reboot_mode} = factory_reset; then run recovery;else if test ${reboot_mode} =