On Sat, 16 Feb 2002, [iso-8859-1] Chris Rankin wrote:
> Hi,
>
> I saw from the CVS ChangeLog that ALSA is moving away
> from the deprecated virt_to_bus() to the new
> pci_allocate_consistent() system calls. Unfortunately,
> this is causing problems for my ISA DMA sound driver
> (CS4231 / MPU401 based). I have currently "fixed"
> things by #undef-ing the ISA_USE_PCI_ALLOC in
> core/pcm_memory.c. Once I do this, I get sound out of
> my speakers again.
>
> My soundcard also needs a DMA-able buffer so that it
> can upload its firmware. Previously, I used
> snd_malloc_pages(), and I tried changing this to
> snd_malloc_isa_pages(). However, you don't export this
> function, and even when I cut-and-pasted it into the
> source file, the firmware wouldn't upload until I used
> the virt_to_bus()-based compatibility version.
>
> It would probably be a good idea to export the
> following functions:
>
> snd_malloc_pci_pages()
> snd_malloc_isa_pages()
> snd_free_pci_pages()
> snd_free_isa_pages()
>
> Does anyone have any idea why
> pci_allocate_consistent() isn't working here, please?
Using pci_allocate_consistent() for ISA DMA allocation routines is
definitely a bad idea. I added snd_malloc_isa_pages() code as you
suggested to snd.o (it seems that it's good to abstract such bus specific
allocation routines).
Jaroslav
-----
Jaroslav Kysela <[EMAIL PROTECTED]>
Linux Kernel Sound Maintainer
ALSA Project http://www.alsa-project.org
SuSE Linux http://www.suse.com
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