I need to set a user environment variable in syslinux mboot.c32 boot menu, and then read it back when I am in the OS. Is there a way to do that?
How to set user environment variable in syslinux mboot.c32 boot loader
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You can set kernel command line variables in the APPEND line (similar to
root=/dev/sda1andconsole=tty0), and the whole kernel command line is available after boot in/proc/cmdline. A tinysedscript could turn that into an environment variable.