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[Christopher Smith]

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[gentoo-catalyst] LiveCD: Unpacking Firmware

[Colleen Josephson]

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I had a question related to the amd64 minimal livecd.

What exactly is happening at the "Unpacking firmware" stage of the boot
process?
Is there a way to find out exactly what firmware is being loaded? Or a way
to boot without loading the firmware?

Why? It is a somewhat strange reason. I am having issues with a high-pitched
hum coming from the audio jacks (occurs on both MB sound and a creative
sound card)
I have a very nice sound system (a sound board, studio monitors...I am an
audio hobbyist), and no other system has these problems, so I am relatively
sure that it is not the speakers/cables.

I have been booting from the liveCD, and I have pinpointed the point at
which the hum starts to something near the *Unpacking firmware stage.
I realize this is somewhat esoteric, but it renders my system almost
useless, and would greatly appreciate any input.

I did interactive mode. The interactive mode only prompts for some of the
items. Among the items it does not prompt for is the firmware unpacking. It
just goes and does it.

-- 
Colleen Josephson
Dept. of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
Class of 2013

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Re: [gentoo-catalyst] LiveCD: Unpacking Firmware

[Colleen Josephson]

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   When drivers load in the system (I guess you have hardware drivers

> built as modules, as opposed to built-in to the kernel?) they will
> start exercising their respective hardware devices.
>

Actually, I've been troubleshooting from the livecd. I guess one of the
modules it loads causes this.


> It could be something simpler as well, some signals that are simply
> being coupled onto analog output.
>
> To say any more you need to find which driver is causing this. Mike's
> advice is the start; find out which drivers coldplugging loads, then
> e.g. load one at a time manually. At some point you should get the
> noise. Then dive deeper into that particular driver case.
>
OK, how do I find out which drivers coldplugging loads?

-- 
Colleen Josephson
Dept. of Electrical Engineering and Computer Science
Massachusetts Institute of Technology
Class of 2013

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Re: [gentoo-catalyst] LiveCD: Unpacking Firmware

[Mike Frysinger]

On Mon, Mar 28, 2011 at 1:25 PM, Colleen Josephson wrote:
>> It could be something simpler as well, some signals that are simply
>> being coupled onto analog output.
>>
>> To say any more you need to find which driver is causing this. Mike's
>> advice is the start; find out which drivers coldplugging loads, then
>> e.g. load one at a time manually. At some point you should get the
>> noise. Then dive deeper into that particular driver case.
>
> OK, how do I find out which drivers coldplugging loads?

run `lsmod` to see what has been loaded.  compare between the
coldplugged boot and the non coldplugged boot.  then load each one by
one.
-mike

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Eric Thompson
thompson.eric@gmail.com

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