At Wed, 25 Jun 2003 07:38:26 -0700 (PDT), Prince John wrote: > > 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?
this kind of problem has appeared when different gcc versions were used for the kernel and the ALSA modules. not sure whether it's your case. the problem #2 also seems like the behavior happening with the gcc-mismatch above. can SH4 trace oops via ksymoops? Takashi ------------------------------------------------------- This SF.Net email sponsored by: Free pre-built ASP.NET sites including Data Reports, E-commerce, Portals, and Forums are available now. Download today and enter to win an XBOX or Visual Studio .NET. http://aspnet.click-url.com/go/psa00100006ave/direct;at.asp_061203_01/01 _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
