研究第一步中串口启动过程中的打印日志和printenv打印出的内容推测启动顺序: bootcmd=run emmcboot emmcboot=echo boot from emmc card ...; run emmcargs; run setbootenv setbootenv=if run loadbootenv; then echoLoaded environment from${bootenv};env import -t ${scriptaddr} ${filesize};fi;if te...
/* Extra U-Boot Env settings */#define CONFIG_EXTRA_ENV_SETTINGS \SERIAL_MULTI \CONSOLE_ARG\PSSERIAL0\"nc=setenv stdout nc;setenv stdin nc;\0"\"ethaddr=20:22:11:29:14:54\0"\"bootenv=uEnv.txt\0"\"importbootenv=echo\"Importing environment from SD ...\"; "\"env import -t $...
"loadbootenv=fatload mmc ${mmc_dev} ${loadaddr} ${bootenv}\0" \ "importbootenv=echo Importing environment from mmc ...; " \ "env import -t ${loadaddr} ${filesize}\0" \ "mmc_load_image=fatload mmc ${mmc_dev} ${kloadaddr} ${bootfile};" \ "fatload mmc ${mmc_dev} ${rdlo...
基本思路是,uboot启动后,从mmc中加载env.txt文件到RAM中,在通过env import指令把env.txt的参数设置为uboot的环境参数,最后通过env.txt参数中的uenvboot启动命令开始加载内核。 通过fatload mmc 0 $kernel_addr_r env.txt;加载env.txt到内存中, 通过env import -t $kernel_addr_r $filesize;把内存中...
"env import -t $loadaddr $filesize\0" \ "loadbootscript=load mmc ${mmcdev} ${loadaddr} boot.scr\0" \ "bootscript=echo Running bootscript from mmc${mmcdev} ...; " \ "source ${loadaddr}\0" #define CONFIG_BOOTCOMMAND \ "if mmc rescan; then " \ ...
16. env命令 DengJin # help env env - environment handling commands Usage: env default -f - reset default environment env edit name - edit environment variable env export [-t | -b | -c] addr [size] - export environmnt env import [-d] [-t | -b | -c] addr [size] - import env...
env分区在读写过程中,如果突然断电,有极小的概率会出现数据损坏,导致env丢失,一但数据丢失系统会启动失败,为保证系统的启动,当env分区数据CRC校验失败时,会自动从default值去启动。 参考uboot 环境变量加载过程分析-爱代码爱编程 在uboot的初始化过程中,环境变量的初始化加载过程如下: ...
53\0" \ 164 "bootenv=uEnv.txt\0" \ 165 "importbootenv=echo \"Importing environment from SD ...\"; " \ 166 "env import -t ${loadbootenv_addr} $filesize\0" \ 167 "loadbootenv=load mmc $sdbootdev:$partid ${loadbootenv_addr} ${bootenv}\0" \ 168 "sd_uEnvtxt_existence_...
env import [-d] [-t [-r] | -b | -c] addr [size] - import environment env print [-a | name ...] - print environment env run var [...] - run commands in an environment variable env save - save environment env set [-f] name [arg ...] ...
get_overlaystring=for overlay in $name_overlays;do;setenv overlaystring ${overlaystring}'#'${overlay};done; importbootenv=echo Importing environment from mmc${mmcdev} ...; env import -t ${loadaddr} ${filesize} init_mmc=run args_all args_mmc init_ufs=ufs init; scsi...