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On Wed, 2005-08-17 at 15:18, Steven Scholz wrote: > Lennert Buytenhek wrote: > > > On Wed, Aug 17, 2005 at 04:00:23PM +0200, Steven Scholz wrote: > > > > > >>Permissible names are: armv2, armv2a, armv3, armv3m, armv4, armv4t, > >> armv5, armv5t, armv5te. > >> > >>Which one would be appropriate for an Atmel AT91RM9200? > > > > > > First google hit on "AT91RM9200": > > http://www.atmel.com/dyn/products/product_card.asp?part_id=2983 > > > > That page mentions that it's an ARM920T core. First google hit on > > "ARM920T": > > http://www.arm.com/products/CPUs/ARM920T.html > > > > That page mentions 'ARMv4T'. > > Thanks for googling for me! ;-) > > So I use either -march=armv4 _OR_ -mcpu=arm920t. Right? > > (Using both brought me a warning about conflicting). the arm920t is an armv4t device (the 't' is thumb). Basically, there are two options, -march=xxx and -mtune=xxx that are independent (one selects the available instructions, the other the best way to use that set for the intended cpu). -mcpu=xxx is shorthand that can be used to set both options in one go: so -mcpu=xxx is equivalent to writing -march=<arch_of(xxx)> -mtune=xxx. Note that to get Thumb code you have to use -mthumb; it's not sufficient to tell the compiler that you have thumb instructions available. R. ------ Want more information? See the CrossGCC FAQ, http://www.objsw.com/CrossGCC/ Want to unsubscribe? Send a note to crossgcc-unsubscribe@sources.redhat.com
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