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Re: Cobalt Qube

On Wed, Dec 02, 1998 at 04:17:45PM +0100, Sven LUTHER wrote:
> On Wed, Dec 02, 1998 at 10:11:15AM -0500, Daniel Jacobowitz wrote:
> > On Wed, Dec 02, 1998 at 04:01:23PM +0100, Sven LUTHER wrote:
> > > The Powerpc can do that also, but i think a particular endianness is chosen
> > > either in the hardware (hardwired, or hardware switch) or by the OS. in the
> > > powerpc it is possible to change endiannes my changing a value in the control
> > > register, but i don't think anyone has yet taken advantage of it, for example
> > > to use little endian only drivers in a big endian setting.
> > 
> > As I understand it, the processor will gladly operate in another
> > endianness - but your firmware may object strenuously.  There's really
> > no adequate way I can see to take advantage of this, except for
> > bragging points.
> what firmware ? what has it to do with it ? it could possibly work on non mac
> hardware then ? I thought the main point was that it would probably confuse a
> lot of things, and that in the long end it would probably be easier to rewrite
> the driver to be endianess aware than to play with the endianness issue ?

Every machine has some sort of boot firmware.  This is (am I out on a
limb here?) probably not endian-independant!  So if you switch the
processor's endianness, it may simply fail to boot.  And yes, fixing
drivers is MUCH easier.


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