[sane-devel] Re: Sane on Ultra Sparc

[T. Ribbrock]

On Fri, Jan 10, 2003 at 10:41:45AM +0100, abel deuring wrote:
[...]
> The SS20 is as 32 bit machine, so this looks indeed like a 32/64 bit 
> problem.
> 
> But is there really no way to compile Sane as a 64 bit program on an 
> UltraSparc?

I jst checked back with some Aurora folks and they confirmed what I
already thought: Userland on UltraSparc is mostly 32bit - only where
it's really needed 64bit is used. 32bit apps and libs are also assumed
to be faster.

For sane this means that to compile sane 64bit one would have to
(re-)build *all* related libraries (starting with libc, libm, etc.pp.)
64bit - quite a lot of work.

The default is 32bit, so I'd say that sane should be able to cope with
that... :-}


> Another option could be to define a "64 bit version" of struct sg_io_hdr 
> in sanei_scsi.c and to use this struct for SG driver write calls. I am 
> not sure though, if it is simply possible to convert 32 bit pointers to 
> 64 bit pointers by filling in leading zeros. Would be good to know a bit 
> more, how 32 bit programs are run on the 64 bit platform.

Unfortunately, neither do I know this. Has that issue been resolved
for Alpha machines?

Cheerio,

Thomas
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      Thomas Ribbrock    http://www.ribbrock.org    ICQ#: 15839919
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