Gentoo Archives: gentoo-user

From: Andrea Conti <alyf@××××.net>
To: gentoo-user@l.g.o
Subject: Re: [gentoo-user] Re: Firmware exists but fails to load
Date: Mon, 15 Aug 2011 14:09:43
Message-Id: 4E492817.20802@alyf.net
In Reply to: [gentoo-user] Re: Firmware exists but fails to load by Nikos Chantziaras
1 > It's not a workaround, but how it's supposed to work. "Loading from
2 > userspace" means using a user-space program to load the firmware. This
3 > is not what you're trying to do, since you don't have such a program.
4
5 ? Udev has been the standard way to service kernel firmware requests for
6 quite some time. The relevant bit is in
7 /lib/udev/rules.d/50-firmware.rules .
8
9 However, udevd is only started after the kernel is loaded, and therefore
10 will only load firmware for drivers which are built as modules.
11
12 Firmware for built-in drivers must either be compiled into the kernel or
13 be provided in an initrd along with a suitable helper.
14
15 Is there a specific reason why the r8169 driver cannot be loaded as a
16 module? AFAIK the only case in which you *need* a built-in net driver is
17 if you're doing root over NFS.
18
19 > Your other option is writing a userspace program that reads the firmware
20 > after the kernel has booted and patches it into the hardware.
21
22 Patching is always done by the kernel driver. The userspace helper only
23 has to answer kernel requests for a specific firmware by providing the
24 correct data.
25
26 > But why would you want to do something like that anyway?
27
28 Typical reasons are to keep the kernel image size down and to avoid
29 having to recompile the kernel whenever a new firmware version is
30 released. Though I'll admit that kernel releases tend to be more
31 frequent than new firmware versions :)
32
33 Just my .02€
34
35 andrea

Replies

Subject Author
Re: [gentoo-user] Re: Firmware exists but fails to load Adam Carter <adamcarter3@×××××.com>