linux-kernel - Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN

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Message-ID: <470BF566.6010204@goop.org>
Date:	Tue, 09 Oct 2007 14:40:54 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Krzysztof Halasa <khc@...waw.pl>
CC:	Timur Tabi <timur@...escale.com>,
	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Anton Altaparmakov <aia21@....ac.uk>,
	Jan Engelhardt <jengelh@...putergmbh.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD

Krzysztof Halasa wrote:
> Some pointer maybe?
>   

Erm, a bit of googling will turn one up, but the gist is that IBM has
traditionally bit 0 for MSB and x for LSB.  It's a pain to work with:
for one, bits in the same place in a word (say, control register) are
renumbered in 32 vs 64.  And I've worked on at least one piece of
hardware in which the hardware designer had a brain-fart and first board
had bit 0 on the CPU wired to bit 0 on the northbridge - should have
been 31 -> 0, 30 -> 1, etc...

    J

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