Dear Folks, I am trying to get ALSA version 1.0.13 working on an AMCC PowerPC PPC405EP Taihu board with a Sound Blaster Live! 24-bit 7.1 PCI card. I am using a patched 2.6.13 kernel that comes with the board. I built the kernel with the sound core built in and I used the cross-compiler tools to build the ALSA driver, library, and utils. When I run "speaker-test", it crashes in the ALSA library. The problem is that the call to mmap in alsa-lib-1.0.13/src/pcm/pcm_mmap.c line 367 which looks like ptr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED, i->u.mmap.fd, i->u.mmap.offset); returns a pointer that appears to be valid (0x3001E000) but causes a kernel OOPS when accessed. Previous calls to mmap in pcm_hw.c on lines 822 and 854 both succeed, and the pointers returned can be successfully accessed, but they use the status and control offsets as parameters to mmap. I haved traced the problem on the target into the ALSA library using gdb and into the kernel using kgdb and everything looks like it works properly. If I disable the semaphore acquisition in do_mmap2, I can print the contents of the address in kgdb using (gdb) print ((char *)vma->vm_start)[0] after the call to vm_link in do_mmap_pgoff. However, the board locks up after the print command. Anyone have any experience with this type of problem on PowerPC systems? -- Thank you, David Cullen Teligy ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-devel
