+++ Hector Oron [2010-01-23 00:49 +0100]: > Hi, > > 2010/1/23 Neil Williams <[email protected]>: > > I get confused about the different ARM types and which map to armel. > > What I understand is that 'armel' (EABI) is a feature on the > instruction set that a CPU is able to execute, since armv4t > instruction set in all processors ever since arm9 (and some arm7) are > able to execute EABI instructions.
Even that isn't quite right. Nothing about EABI requires a particualr CPU. However the _implementation_ in gcc/binutils requires an armv4t or later instruction set, because EABI needs an atomic function in order to support switching between arm and thumb instructions (IIRC), and eabi supports this mixing of thumb and arm on a per-function basis. It was difficult to do this for armv4 and earlier (v3) instruction-set CPUs, and as they are all (?) pretty-much obsolete no-one made the effort to actually do that. So that's the long version. The short version is: you need armv4t or later for armel. I haven't been keeping up recently but I think everything being produced which has enough welly to run linux is at least arm v5 these days. I don't know most of the CPUs in the list, but lookng up the instruction set they have will tell you if any are so ancient as to be armel-incompatible. Wookey -- Principal hats: iEndian - Balloonboard - Toby Churchill - Emdebian http://wookware.org/ -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected]
