Yokemate of Keyboards
Posts: 2053 from 2003/6/4
Quote:Andreas_Wolf schrieb:
> AFAIK most ARM CPU's are bi-endian. At least I think that's the case with ARMv7/Cortex
After
half a decade of assumptions, speculation and guesswork here on MorphZone, I think I found the definite answer on the question of ARM's endianness using these references:
http://translatedcode.wordpress.com/2012/04/02/this-end-up/
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0203g/Chddgffb.html
The gist of it is that ARM knows one little-endian mode (on both data and code level, aka true little-endian) and two big-endian modes: BE32 and BE8. BE32 is big endianness on both data and code level (aka true big-endian), whereas BE8 is data-only big endianness.
BE32 is supported by:
- ARMv4
- ARMv5
- ARMv6
BE8 is supported by:
- ARMv6
- ARMv7
- ARMv8
Andreas, you're the man! Good find. I almost gave up about that issue.
The beefier ARMs hence don't have the benefit of an easier to accomplish binary compability.
The Raspberry pi however is ARMv6 based....
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