I can not boot USB on Power Mac G5

[Classic Finder]

Hello, I have Power Mac G5 with no Mac OS X. I want install Mac OS X via USB (using Open Firmware).

But when I boot my USB, I see prohibited symbol. Please help, I prepared my installation USB in Linux, by the way. And I used this command for booting my USB:

boot usb0/disk@1:,\\:tbxi

I am not sure this is wrong or not, please help...

 

[Classic Finder]

I really need any suggestion, I will try...

 

[Classic Finder]

Guys I booted my USB successfully... I am installing Mac OS X right now... I guess I entered this command and worked fine:

boot usb1/disk@1:3,\System\Library\CoreServices\BootX

 

[Builder68]

What specific model of PowerMac G5 you have? From what year?