targets代表目标名, 也就是当前目录下某个文件的名称. prerequisites代表该targets的依赖关系 command代表命令. 如果命令与targets在同一行, 则需以”;”分隔, 如果另起一行, 则前面必须是”TAB” . Makefile中用”TAB”标示一个command.这个语法代表个什么意思呢? 概况起来就一句话, 记牢这句话:...
bootcmd=run distro_bootcmd 启动目标Boot Targets distro_bootcmd 变量的定义和使用方式因供应商而异，...
=> printenv distro_bootcmd distro_bootcmd=for target in ${boot_targets}; do run bootcmd_${target}; done => printenv boot_targets boot_targets=mmc1 mmc0 pxe dhcp 1. 2. 3. 4. 5. 6. 我在do_run解析了arg参数后,添加了参数打印,断点依然在probe函数中,接着可以看到如下,参数包括boot_net...
bootcmd=run distro_bootcmd 启动目标Boot Targets distro_bootcmd 变量的定义和使用方式因供应商而异,但它通常包含一系列命令,用于扫描预定义的潜在启动目标列表以搜索启动附加信息,如下所示。 boot_targets=mmc0 jtag mmc0 mmc1 qspi0 nand0 usb0 usb1 scsi0 pxe dhcp distro_bootcmd=scsi_need_init=; for...
boot_targets=mmc1 mmc0 pxe dhcp bootcmd=run distro_bootcmd; run bootflash; bootcmd_dhcp=if dhcp ${scriptaddr} ${boot_script_dhcp}; then source ${scriptaddr}; fi;setenv efi_fdtfile ${fdtfile}; if test -z "${fdtfile}" -a -n "${soc}"; then setenv efi_fdtfile ${soc}-${...
-t) shift ; TARGETS="`echo $1 | sed 's:_: :g'` ${TARGETS}"; shift ;; *)break;; esac done $#是脚本传递的参数的个数。-gt是>的意思。 $1:第一个参数。shift:去掉第一个参数,将第二参数变成第一个……这段代码意思 检查参数中,有无-a -n -t这样的参数,没有的话直接break,传递的参...
- due to $(notdir $@) not in $$(targets) \ ) \ ) \ ) \ ), \ - due to target missing \ ) \ ) echo-why = $(call escsq, $(strip $(why))) endif KBUILD_VERBOSE一般我们会采用默认值0(需要调试编译除外),所以 echo-why 为空。
结合前面boot_targets为mmc1,也就是说distro_bootcmd最终会运行bootcmd_mmc1环境参数。在前面我们知道,mmc0表示的sd卡的存储设备,mmc1表示的emmc设备。1 2 3 4 => printenv bootcmd_mmc0 bootcmd_mmc0=setenv devnum 0; run mmc_boot => printenv bootcmd_mmc1 bootcmd_mmc1=setenv devnum 1...
boot_targets=fel mmc0 usb0 pxe dhcp bootcmd=run distro_bootcmdbootcmd_dhcp=run boot_net_usb_start; if dhcp ${scriptaddr} ${boot_script_dhcp};bootcmd_fel=if test -n ${fel_booted} && test -n ${fel_scriptaddr}; then echo 'ibootcmd_mmc0=setenv devnum 0; run mmc_bootbootcmd_...
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