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accessing efivarfs in debian-installer



Hello

I have an ASUS T100TA [1] and I'm trying to use the wifi device with 
the Debian Installer for Stretch Alpha 5 .

As explained here [2], the wifi device requires a proprietary firmware 
and its nvram-file, a UEFI configuration variable from 
/sys/firmware/efi/efivars. Loading the firmware in the DI is not a 
problem but I'm unable to access the efivarfs interface. 

Using a tty console in the DI, I can see that the directory 
/sys/firmware/efi/efivars is there but it is empty. Mounting the 
efivarfs in this path [2] fails with the "no such device" message, and 
lsmod doesn't show the efivars and efivarfs modules, which I suppose 
are required.

So, is it possible to access the efivarfs interface and retrieve the 
required nvram-file inside the DI environment?

If you answer, please add my e-mail address in CC because I'm not 
subscribed to this list. Thank you very much.

Francesco

[1] https://wiki.debian.org/InstallingDebianOn/Asus/T100TA
[2] https://wiki.debian.org/InstallingDebianOn/Asus/T100TA#WiFi


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