On Wednesday 23 November 2016 23:23:35 Pavel Machek wrote:

Hi!

quoted

quoted

quoted

As wl1251.ko does not accept mac_address as module parameter,
such modprobe hook does not help -- as there is absolutely no
way from userspace to set or change (permanent) mac address.

Quoting modprobe.d manual:

quoted

      install modulename command...
      
          This command instructs modprobe to run your
          command instead of inserting the module in the
          kernel as normal. The command can be any shell
          command: this allows you to do any kind of
          complex processing you might wish. [...]

I know. But this do not allow me to send mac address to kernel --
as kernel does not support such command yet (reason for my first
question).

Plus, this does not really work for cases where wl1251 is not a
module.

Yes, this is another problem.

quoted

quoted

You can hook up a script that cooks up wl1251-nvs.bin (caldata,
macaddr) and then insmod the actual wl1251.ko module. Or you can
just cook up the nvs on first device boot and store it in
/lib/firmware (possibly overwriting the "generic" wl1251 from
linux-firmware).

This is what I would like to prevent -- overwriting (possible
readonly) system files with some device specific. It is really bad
idea!

Agreed.

"ifconfig hw ether XX" normally sets the address. I guess that's
ioctl?

This sets temporary address and it is ioctl. IIRC same as what ethtool 
uses. (ifconfig is already deprecated).

And I guess we should use similar mechanism for permanent
address.

I'm not sure here... Above ioctl ↑↑↑ is for changing temporary mac 
address. But here we do not want to change permanent mac address. We 
want to tell kernel driver current permanent mac address which is stored 
in permanent mac address storage (in N900 case in mtd). Just like 
userspace helper as kernel driver do not have code which can read 
permanent mac address.

-- 
Pali Rohár
pali.rohar@gmail.com