i.MX Processors中的主题 Access u-boot variable from userspace

Access u-boot variable from userspace

just_piash — Thu, 22 Aug 2019 07:29:47 GMT

Hello,

I was trying to get a u-boot variable from logo.c(/drivers/video/logo/logo.c). Please let me know how can I access the variable from logo.c file. I want to get the value of console. If I use "fw_printenv console" command, the output is console=ttys0. I want to get the output ("fw_printenv console") value of the u-boot variable from logo.c.

Thanks!

u-boot env‌ yocto-project

Best regards

Ali

Re: Access u-boot variable from userspace

b36401 — Fri, 23 Aug 2019 07:40:33 GMT

You can use something like this:
# fw_printenv console | cut -d= -f2
to get the part of the output after "=".

Re: Access u-boot variable from userspace

just_piash — Mon, 26 Aug 2019 06:49:13 GMT

Thanks for your suggestion. Could you please let me know which log or how can I see the output if I use"printk(fw_printenv console | cut -d= -f2)" in logo.c(/drivers/video/logo/logo.c). I was trying to see the output.I have logged in to the device while turning on, but it only shows the kernel messages.