Hi, I'm working on an Alsa driver for a Hitachi SH4 based board with an AC'97 codec (AD1881). ALSA driver - Ver. 0.9.1 Linux kernel - Ver. 2.4.18
All the modules are getting loadedand AC'97 read/write call backs are working fine. But I'm facing following problems: Problem 1: Segmentation Fault while reading the AC97 proc entries. /proc/asound/card0 directory contents: # ls -l /proc/asound/card0 -r--r--r-- 1 root root 0 Jun 7 16:10 Aspen18xx -r--r--r-- 1 root root 0 Jun 7 16:10 ac97#0 -r--r--r-- 1 root root 0 Jun 7 16:10 ac97#0regs -r--r--r-- 1 root root 0 Jun 7 16:22 id dr-xr-xr-x 3 root root 0 Jun 7 16:22 pcm0c dr-xr-xr-x 3 root root 0 Jun 7 16:22 pcm0p -------------- Following error comes when I try to read the ac97#0 files: # cat ac97#0 Unable to handle kernel NULL pointer dereference at virtual address 00000000 pc = 8c11091e *pde = 00000000 Oops: 0000 PC : 8c11091e SP : 8c47dc10 SR : 40000100 TEA : c0100034 Not tainted R0 : 00000002 R1 : 00000000 R2 : 0000007e R3 : c014c685 R4 : 0000000a R5 : ffffffff R6 : c014c684 R7 : ffffffff R8 : 8cd75df4 R9 : 8c47dc60 R10 : 00000000 R11 : ffffffff R12 : 00000002 R13 : 8c47de5f R14 : 8c47dc60 MACH: 000004bf MACL: 00000000 GBR : ff800000 PR : c01022be ------------------- # cat Aspen18xx Fault in unaligned fixup: 0000 ------------------- Similar types of errors are coming while reading other proc files (in this dir) too. I think the error happens during the snd_iprintf function calls in ac97_codec.c file, but don't know how to resolve it. Has anybody face this problem? Any ideas to resolve it? Problem 2: I have cross compiled the alsa utilities for my target (SH4 based). While executing (in super user mode) 'alsamixer', it terminates with following error message: ALSA lib control.c:612:<snd_ctl_open_noupdate> Invalid CTL default alsamixer: function snd_ctl_open failed for default: In mailing list, I could see many queries on this error, but couldn't find any proper solution for this. The snddevices script was run before this, which creates the relevant device under /dev Could you please give some advices to resolve these issues? Thanks a lot, Prince. __________________________________ Do you Yahoo!? SBC Yahoo! DSL - Now only $29.95 per month! http://sbc.yahoo.com ------------------------------------------------------- This SF.Net email is sponsored by: INetU Attention Web Developers & Consultants: Become An INetU Hosting Partner. Refer Dedicated Servers. We Manage Them. You Get 10% Monthly Commission! INetU Dedicated Managed Hosting http://www.inetu.net/partner/index.php _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
