Uboot选项用于打印引导时间前缀

Question

Is there any uboot config option to print boot sequence with time prefixes similar to kernel option CONFIG_PRINTK?

I am expecting output like below,

[    0.000000] U-Boot 1.1.4-gedeced79 (Feb  6 2012 - 09:27:11)
[    0.011300] Starting kernel ...
[    0.015686] Uncompressing Linux... done, booting the kernel

Answer 1

define DEBUG config option is best for your purpose, it is picked up by all u-boot code after you put it in your include/configs/myboard.h. (each config option is '#define', but that is doing strange things in my page preview)

Also define CONFIG_BOOTSTAGE. You can look at README for this, code is in common/bootstage.c, its functions do some of what you want. You may have to add a function show_boot_progress() in your BSP, for these functions to be used. With those in place, I believe there are already hooks in infrastructure code for them to get called, but I haven't used this option.

Answer 2

I am not aware of U-Boot config option that does such thing, but there are some other techniques which enables you to do it. Ie config option inside the Linux kernel.

Take a look at: Measuring Boot-up time