向linux kernel中添加cmdline的四种方式

最新推荐文章于 2023-12-03 01:28:51 发布

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#android #linux

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在linux启动时候，串口log中会打印cmdline

[ 0.000000] c0 0 (swapper) Kernel command line: earlycon androidboot.selinux=permissive uart_dma keep_dbgclk_on clk_ignore_unused initrd=0xd0000000,38711808 rw crash_page=0x8f040000 initrd=/recoveryrc boot_reason=0x2000 ota_status=0x1001

在linux启动完成后，通过 cat /proc/cmdline也是可以看到cmdline. 那么cmdline是如何添加的呢？

1、在dts中的bootargs中添加

/ {

    model = "xxx yyyyyyy FPGA";

    compatible = "xxx ,yyyyy-fpga", "xxx ,yyyyyy";



    chosen {

        /*

         * initrd parameters not set in dts file since the ramdisk.img size

         * need to check in uboot, and the initrd load address and size will

         * set in uboot stage.

         */

        bootargs = "earlycon androidboot.selinux=permissive uart_dma keep_dbgclk_on clk_ignore_unused";

        stdout-path = "serial0:115200";

    };

......

}

2、在BoardConfig中添加

vim device/xxx/xxx_evb/BoardConfigCommon.mk



BOARD_KERNEL_CMDLINE += androidboot.selinux=enforcing androidboot.hardware=xxxxx_phone androidboot.dtbo_idx=0

3、在uboot中添加

vim u-boot/common/cmd_bootm.c

append_bootargs("recovery=1");

sprintf(dm_buf,"init=/init skip_initramfs rootwait root=/dev/dm-0 dm=\"system none ro,0 1 android-verity /dev/mmcblk0p%d\"",ret);

append_bootargs((const char *)dm_buf);

4、在android的Makefile中添加

vim build/core/Makefile



INTERNAL_KERNEL_CMDLINE := $(strip $(BOARD_KERNEL_CMDLINE) buildvariant=$(TARGET_BUILD_VARIANT) $(VERITY_KEYID))

ifdef INTERNAL_KERNEL_CMDLINE

INTERNAL_BOOTIMAGE_ARGS += --cmdline "$(INTERNAL_KERNEL_CMDLINE)"

endif