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The arm9tdmi is the main 'core' of the CPU. The arm920t is the core plus the associated cache, mmu, and system registers. Different models all have substantially the same 'core' but may have different (or missing) additional parts...
Thanks. So when I am using Freescale i.MX and Atmel AT91RM9200 which are both arm920t I rather use
GCC_EXTRA_CONFIG="--with-float=soft --with-cpu=arm920t \ --enable-cxx-flags=-mcpu=arm920t"
instead of
GCC_EXTRA_CONFIG="--with-float=soft --with-cpu=arm9tdmi \ --enable-cxx-flags=-mcpu=arm9tdmi"
when building the toolchain. Right?
ARGH! There's no "--with-cpu=arm920t" !
This has been fixed in gcc-4.0 and it's also been fixed in the CodeSourcery version of 3.4 (http://www.codesourcery.com/gnu_toolchains/arm/).
gcc/config/arm/arm.h only knows
#define TARGET_CPU_arm9 0x0080 #define TARGET_CPU_arm9tdmi 0x0080
Ok.So when arm9tdmi is only thre core without caches will "--with-cpu=arm9tdmi" use the caches in a sane way ?
It probably makes no difference in 3.4 and earlier. It might have a small effect in later versions, but gcc doesn't really understand caches and their layout yet.
-- Steven
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