From owner-freebsd-current  Thu Apr  4 10:43:16 2002
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Date: Thu, 4 Apr 2002 10:43:01 -0800 (PST)
From: Matthew Jacob <mjacob@feral.com>
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To: Andrew Gallatin <gallatin@cs.duke.edu>
Cc: freebsd-current@freebsd.org
Subject: Re: BUS_SPACE_MAXSIZE & isp driver.
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Ah- this bit Marcel with FreeBSD-ia64 too. I hadn't gotten too that.

I haven't tried it yet in i386. Worked for in Alpha && Sparc64, but I guess it
didn't work for all alphas. I just reinstalled 5.0 and will be trying an i386
kernel shortly.

It would seem to me you can't have BUS_SPACE_MAXSIZE less than MAXPHYS- that
seems absurd to me.

What happened here is that in trying to make isp work for sparc64, I redid the
usage of bus_dma. Since the author never finished man pages or wrote up a
spec, the implementations (and architecture) is open to interpretation.

-matt


On Thu, 4 Apr 2002, Andrew Gallatin wrote:

> 
> I just booted a recent current (or rather attempted to) and saw this
> when attempting to mount root from a qlogic card on my miata:
> 
> 
> bus_dmamap_load: Too many segs! buf_len = 0x2000
> spec_getpages:(da0a) I/O read failure: (error=22) bp
> 0xfffffe0004087ae8 vp 0xfffffe000ae90000
>                size: 98304, resid: 98304, a_count: 98304, valid: 0x0
>                nread: 0, reqpage: 7, pindex: 59, pcount: 12
> vm_fault: pager read error, pid 1 (init)
> 
> <... more of same ...>
> 
> The only way I could get the system to boot was to increase
> BUS_SPACE_MAXSIZE to 128K to match MAXPHYS.  I don't know why they
> don't match in the first place (they don't match on x86 either, so the
> driver will probably puke there too.)
> 
> #define BUS_SPACE_MAXSIZE    (128 * 1024)
> 
> Does anybody know why BUS_SPACE_MAXSIZE != MAXPHYS on some platforms?
> 
> Thanks,
> 
> Drew
> 


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