[parisc-linux] HP C240 With Debian 3.0

[parisc-linux] HP C240 With Debian 3.0

[Peter Saisanas]

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Hi, I am having problems with the stability of Debian 3.0 (Woody) on my C240. basically i can boot up the CD fine and get to the installation of the Kernel and base config. However about 3 out of 5 times i get the infamous error, 

"Kernel panic: ccio-dma.c: ccio_alloc_range() I/O MMU is out of mapping resources" and the c240 locks up. 
.
One thing i have noticed is that it seems to do this when there is heavy usage of the SCSI Bus (i.e installing linux from the CD). I did seach the message list for this problem previously but im not too sure if there was a solution, (I'm sure there is one).

But on rare occations i can at least install the base system and it works very nicely

I have 128MB of ram (Not that this is probably causing the problem). and the kernel that im running is the one that is on the Deb 3.0 CD (2.4.19 i believe)

What do i need to do to get the C240 stable and stop the machine crashing.
Keep up the great work.

Cheers
Peter Saisanas


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Re: [parisc-linux] HP C240 With Debian 3.0

[Grant Grundler]

"Peter Saisanas" wrote:
> "Kernel panic: ccio-dma.c: ccio_alloc_range() I/O MMU is out of mapping =
> resources" and the c240 locks up.=20

This has come up before on the mailing list.
We need to change ccio_mem_ratio to 2 or otherwise fix
how iova_space_size is getting calculated.

...
> But on rare occations i can at least install the base system and it =
> works very nicely
...
> What do i need to do to get the C240 stable and stop the machine =
> crashing.

arch/parisc/kernel/ccio-dma.c: unmodified: line 169 of 1615 [10%].

/* Ratio of Host MEM to IOV Space size */
static unsigned long ccio_mem_ratio = 4;

replace 4 with 2.

grant