[parisc-linux] C100 and ccio-dma

[Ryan Bradetich]

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Erik & Grant,

I think I have finally tracked this problem down... I don't think it is a bug
in either the ccio-dma or the sym53c8xx driver.... I believe it is a sizing
issue with the IO PDIR in the ccio-dma.  I spent some time last week
increasing the density of the IO PDIR by 4x ... it looks like I still have some
work to do :)

I increased the the IO PDIR ratio to main memory by 4x and I can
successfully format a 4G partition in my C200+.  (When I bumped
the IO PDIR ratio by 2x, is still had problems...)

Erik ... I've attached a small patch for you to try and see if it works for
you.

Thanks,

- Ryan


> Hi,
>         Using the CVS kernel on a C100 I'm seeing it die with an out-of-mapping
> resources error from ccio-dma.c. It looks like there's been some active
> development there about a week ago, but it's not helping my machine. The
> quickest way for me to bring it about is to try and use mke2fs, but just
> mounting the CD and running a few commands will oftentimes do the trick.
>
> How can I help debug this? There's really no useful information provided by
> the printk now - is there some sort of debugging info I could be collecting,
> or would a backtrace help?
>
> Thanks
>
> -Erik
>
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Index: ccio-dma.c
===================================================================
RCS file: /home/cvs/parisc/linux/arch/parisc/kernel/ccio-dma.c,v
retrieving revision 1.10
diff -u -p -u -r1.10 ccio-dma.c
--- ccio-dma.c	2000/09/15 00:57:14	1.10
+++ ccio-dma.c	2000/09/23 05:26:51
@@ -200,7 +200,7 @@ struct ccio_device {
 
 
 /* Ratio of Host MEM to IOV Space size */
-STATIC u_long ccio_mem_ratio = 16;
+STATIC u_long ccio_mem_ratio = 4;
 STATIC struct ccio_device *ccio_list = NULL;
 
 /**************************************************************

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