Best -march & -mtune flags for XScale-PXA270 rev 7 (v5l)

[Oleg Kravchenko <oleg at kaa dot org dot ua>]

Hello!

I am play with my Asus P535 phone and can't find best cflags
>asusp535 ~ # cat /proc/cpuinfo
>Processor       : XScale-PXA270 rev 7 (v5l)
>BogoMIPS        : 519.37
>Features        : swp half thumb fastmult edsp iwmmxt
>CPU implementer : 0x69
>CPU architecture: 5TE
>CPU variant     : 0x0
>CPU part        : 0x411
>CPU revision    : 7
>Cache type      : undefined 5
>Cache clean     : undefined 5
>Cache lockdown  : undefined 5
>Cache format    : Harvard
>I size          : 32768
>I assoc         : 32
>I line length   : 32
>I sets          : 32
>D size          : 32768
>D assoc         : 32
>D line length   : 32
>D sets          : 32
>
>Hardware        : Asus P535
>Revision        : 0000
>Serial          : 0000000000000000

I have error when i try compile this source
>asusp535 ~ # cat test2.c
>int main(void) { __asm__ volatile ("wunpckelub wr6, wr4"); return 0; }
>
>asusp535 ~ # gcc -march=armv5te -mtune=iwmmxt test2.c -o /dev/null
>/tmp/cc3tFpwv.s: Assembler messages:
>/tmp/cc3tFpwv.s:24: Error: selected processor does not support `wunpckelub 
>wr6,wr4'

What cflags and chost is a best for my phone?

Thanks