cross-compile getting started

Igor Neuhold

so let's say i want to compile some package, i need alsa sound drivers, when i run madplay some.mp3 i get
MPEG Audio Decoder 0.15.2 (beta) - Copyright (C) 2000-2004 Robert Leslie et al.
audio: /dev/dsp: No such device or address

or to compile libasound2-dev or for start any other package, what's the process to compile step by step?
teach me how to do this and i'll host or contribute all packages i compile

Boken Lin

@Igor-Neuhold For example, to compile kmod-usb-audio package, here's what you do:

Setup the cross-compile environment as outlined in the wiki
Use make menuconfig and select kmod-usb-audio, it is under Kernel Modules > Audio Support
Exit out of menuconfig and save settings
Run make to initiate the compilation process (First-time compile will take a while because it needs to build the toolchain, etc)
Once the build process is completed, go into bin/ar71xx/packages. That's where all the compiled packages can be found. In the case of kmod-usb-audio, you should be able to find it under the base directory.
To install the files you just need to download the .ipk file and install it on the Omega with opkg.

Igor Neuhold

thanks, i'm compiling it now, do you have a repository where we can upload packages for omega or should i just upload it on my server and post a link?
also how do you add package that is not listed in menuconfig? for example i would like to add alsa package, i found few on other openwrt repos but can't use them. Do i download source and if i do, where do i put it?

Igor Neuhold

opkg install kmod-usb-audio_4.1.13-1_ar71xx.ipk
Multiple packages (kmod-usb-audio and kmod-usb-audio) providing same name marked HOLD or PREFER. Using latest.
Installing kmod-usb-audio (4.1.13-1) to root...
Multiple packages (kmod-usb-core and kmod-usb-core) providing same name marked HOLD or PREFER. Using latest.
Multiple packages (kmod-input-core and kmod-input-core) providing same name marked HOLD or PREFER. Using latest.
Collected errors:

satisfy_dependencies_for: Cannot satisfy the following dependencies for kmod-usb-audio:
kernel (= 4.1.13-1-f20acdb789387285e1d949db8d2fb118) * kernel (= 3.18.20-1-7bed08fa9c06eb8089e82c200340ec66) *
opkg_install_cmd: Cannot install package kmod-usb-audio.

how do i set the right kernel? I have no idea why 4.1 is used

Igor Neuhold

using --force-depends now throws this:
Configuring kmod-usb-audio.
failed to find a module named snd-usbmidi-lib
failed to find a module named snd-usb-audio

Boken Lin

Hi @Igor-Neuhold, you were probably using the development branch of OpenWRT. Can you try compiling with the stable/release branch of OpenWRT? The git repository is here: git://git.openwrt.org/15.05/openwrt.git.

Please let me know if that works.

Thomas Mueller

I had success with compiling the packages for omega.

Here you can find kmod-sound-core_3.18.23-1_ar71xx.ipk and kmod-usb-audio_3.18.23-1_ar71xx.ipk.

Install them with

opkg --force-depends install kmod-sound-core
opkg --force-depends install kmod-usb-audio

Igor Neuhold

@Thomas-Jones I get this:
Installing kmod-usb-audio (3.18.23-1) to root...
Configuring kmod-usb-audio.
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
4 modules could not be probed

snd
snd-rawmidi
snd-seq-device
snd-usbmidi-lib
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
failed to find dependency input-core
8 modules could not be probed
snd
snd-hwdep
snd-pcm
snd-rawmidi
snd-seq-device
snd-timer
snd-usb-audio
snd-usbmidi-lib
Collected errors:

satisfy_dependencies_for: Cannot satisfy the following dependencies for kmod-usb-audio:
kernel (= 3.18.23-1-735bbd0a915906145eb1b3fec1a6ff8b) *

did you have success with usb sound card audio? I mean, can you play sound with omega

Thomas Mueller

Hi,

as I already wrote in this thread, yes I had success and I can hear music via usb audio device.

Igor Neuhold

finally some hope
do you know why i get these errors or how to load these modules, can you also upload kmod-input-core?

Thomas Mueller

I've uploaded kmod-input-core_3.18.23-1_ar71xx.ipk now in the same dropbox.

Also I've added a small video (sorry for the poor quality), to see onion omega running squeezelite in autostart and playing music

Igor Neuhold

Thomas you are my hero, i love you

Thomas Mueller

Is it working now for you?

Igor Neuhold

yes, and i have been struggling with this for days now, installed a bunch of crap and now i have to figure out how to clean it all up so i can run my node server with mp3 player, you have no idea how good it felt to hear the sound after days of googling, compiling, installing and removing modules.
I just hope I'll be able to return the favour some day

Thomas Mueller

Great to hear, that I could help someone.

Which node server do you want to use on the omega?

Igor Neuhold

i'm writing my own lightweight server for audio streaming, currently i've made frontend client which decodes mp3 file and send buffer to server, now i'm trying to write that buffer to a file and stream it with madplay on omega. Some future plan is to add sd card or some other data storage so i can queue more files or save songs which finish streaming and add them to some playlist