The -mtune=cortex-a8 will optimise the generated code for the Cortex-A8
(ARMv7 processor) pipeline but not affecting the instruction set used
(which is still ARMv5T). The resulting code will be optimal on ARMv7 but
there may be a slight drop (if any) on other architecture versions.

Without the Debian gcc patches for forcing ARMv4T, the default in gcc I
think is ARMv5T anyway.

AFAIK, the Xscale platform is ARMv5T but without the VFP coprocessor
(affected by the -mfpu=vfp option). Is Thecus planned to be a supported
platform by the upcoming ARM Ubuntu port?

-- 
armel gcc default optimisations
https://bugs.launchpad.net/bugs/303232
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