Installing oss2jack

From Arnout Engelen

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Used directions at http://fort.xdas.com/~kor/oss2jack/install.html

  • need to use newest version of kfusd
  • had to use full path to .ko file for 'insmod', modprobe doesn't find it yet

Contents

[edit] Make errors

With 1.10-11, I had the following problems:

[edit] make.include:149: obj.i686-linux/libfusd.d: No such file or directory

It's created afterwards, just run 'make' again.

[edit] dereferencing type-punned pointer will break strict-aliasing rules 

gcc -Werror -fPIC -Wall -O2 -g -I. -Iinclude -I././include  -L././obj.i686-linux  ././libfusd/libfusd.c -c -o obj.i686-linux/libfusd.o
cc1: warnings being treated as errors
././libfusd/libfusd.c: In function ‘fusd_dispatch_one’:
././libfusd/libfusd.c:444: warning: dereferencing type-punned pointer will break strict-aliasing rules
make: *** [obj.i686-linux/libfusd.o] Error 1

Solution: adding '-fno-strict-aliasing' to the CCFLAGS on line 67 of make.include

[edit] Entering an unknown directory 

 make -C /lib/modules/2.6.20-5-lowlatency/build SUBDIRS=/home/arnouten/progs/fusd-kor-1.10-11/kfusd EXTRA_CFLAGS=-I/home/arnouten/progs/fusd-kor-1.10-11/kfusd/../include modules
 make: Entering an unknown directory
 make: *** /lib/modules/2.6.20-5-lowlatency/build: No such file or directory.  Stop.
 make: Leaving an unknown directory

Solution: installing the linux-headers-2.6.20-5-lowlatency kernel headers package

[edit] linux/config.h not found 

 make[2]: Entering directory `/usr/src/linux-headers-2.6.20-5-lowlatency'
 CC [M]  /home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.o
 /home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.c:60:26: error: linux/config.h: No such file or directory

linux/config.h was removed in the 2.6.20 kernel series, looks like kfusd wasn't yet updated to reflect that change.

Solution: (for now): remove the #include from kfusd/kfusd.c and see what breaks ;)

[edit] linux/devfs_fs_kernel.h not found

devfs has also been removed: has been deprecated for a while. Even though most devfs code has been enclosed by #ifdef CONFIG_DEVFS_FS, not all.

Solution: add #ifdef CONFIG_DEVFS_FS in a couple of places:

  • around the devfs_remove calls, ~2960 kfusd.c
  • around the register_failed2:-label ~2973

[edit] unknown field ‘writev’ specified in initializer 

 make[2]: Entering directory `/usr/src/linux-headers-2.6.20-5-lowlatency'
 CC [M]  /home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.o
 /home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.c:2517: error: unknown field ‘writev’ specified in initializer
 /home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.c:2517: warning: initialization from incompatible pointer type

Solution: not sure,commented writev out.

[edit] expected ‘)’ before string constant

make[2]: Entering directory `/usr/src/linux-headers-2.6.20-5-lowlatency' 

 CC [M]  /home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.o

/home/arnouten/progs/fusd-kor-1.10-11/kfusd/kfusd.c:181: error: expected ‘)’ before string constant

That line reads: 

MODULE_PARM(fusd_debug_level, "i");

Which seems to be deprecated.

Solution: Since I'm not using that parameter anyway, I just removed the line declaring the parameter.

[edit] udev stuff

The fusd.rules rules I had success with are: 

# fusd devices
KERNEL="control", NAME="fusd/control", GROUP="audio"
KERNEL="status", NAME="fusd/status", GROUP="audio"

[edit] usage problems 

$ sudo insmod /lib/modules/2.6.20-5-lowlatency/misc/kfusd.ko 
$ oss2jack 
libfusd: /dev/fusd/control does not exist; ensure FUSD's kernel module is installed
Could not create DSP device
: Package not installed

Indeed /dev/fusd is not there.

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