Thanks roadrunner for answer. I don't have other RB to check if that image would work but it must be this reason. Anyway, few days ago on wiki page
http://wiki.mikrotik.com/wiki/Metarouter appeared new images and new patch for OpenWRT sources. I downloaded tgz for PowerPC platform and imported metarouter from image. After a few seconds RB hanged and didn't want to get up, even after reboot. Unfortunatelly this RB is used in my company as a one of devices providing Internet connection :/ Yes, I know, I shouldn't experiment on production router but I thought that metarouter feauture is stable. Anyway I've configured other device as a router and connected RB to my workstation. The only way to contact this device was through serial port. I rebooted it and observed what is happening. There was message about booting and RB booted normally until login prompt appeared. After few seconds error message was displayed:
MikroTik 4.6
XXX Login: BUG(1): UNKNOWN instr 7cf7faa6 at 0x80000054!
pc=0xfff00e20 cpc=0xfff035f4 lr=0xfff00b50 ctr=0xfff00c7c
regs=0xfff07768 cr=0x85699622 xer=0x6000005a
r0=0x00000000 r1=0xfed71ef0 r2=0xa569962d r3=0x00000005
r4=0x80000054 r5=0x7cf7faa6 r6=0x00004000 r7=0xffffffff
r8=0x00000480 r9=0xfff00000 r10=0xfe826000 r11=0xfe826000
r12=0xa569962d r13=0x6996965a r14=0xa5e99e2d r15=0xe996965a
r16=0xfe826054 r17=0xfe826420 r18=0xfff06f70 r19=0xfff06f3c
r20=0xfff06ed4 r21=0xfff07428 r22=0xfe826780 r23=0x80000000
r24=0xfe826454 r25=0xfff07428 r26=0x00000000 r27=0x00000001
r28=0x00000000 r29=0x80000054 r30=0x80000054 r31=0x80000054
dear=0x300ce000 msr=0x00020000(00020000) esr=0x02000000
And I couldn't do anything. I had to reinstall system using Netinstall. After RB was operable I tried again to setup metarouter the same way as before but the effect was the same.
I reinstalled system once again and I build my own OpenWRT compilation from trunk and with use of provided patch (v1.2) (target system Metarouter PowerPC). I imported metarouter from this new image and I was observing what is happening on serial terminal. Few seconds after I initialized import similar error appeared on terminal window:
MikroTik 4.6
XXX Login: BUG(2): UNKNOWN instr 7cf7faa6 at 0x80000054!
pc=0xfff00e20 cpc=0xfff035f4 lr=0xfff00b50 ctr=0xfff00c7c
regs=0xfff07768 cr=0x9a9669d3 xer=0xa0000025
r0=0x00000000 r1=0xfed1fef0 r2=0x5a9669d2 r3=0x00000005
r4=0x80000054 r5=0x7cf7faa6 r6=0x00004000 r7=0xffffffff
r8=0x00000480 r9=0xfff00000 r10=0xfe80a000 r11=0xfe80a000
r12=0x5a9669d2 r13=0x966969a5 r14=0x5a9669d2 r15=0x966969a5
r16=0xfe80a054 r17=0xfe80a420 r18=0xfff06f70 r19=0xfff06f3c
r20=0xfff06ed4 r21=0xfff07428 r22=0xfe80a780 r23=0x80000000
r24=0xfe80a454 r25=0xfff07428 r26=0x00000000 r27=0x00000001
r28=0x00000000 r29=0x80000054 r30=0x80000054 r31=0x80000054
dear=0x806f52c4 msr=0x00020000(00020000) esr=0x02000000
I don't know... am I doing anything wrong or provided patch is not suitable for RB1000?
Please warn your customers on metarouter Wiki about possible serious problems while setuping new metarouter.