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RM46L852: gdbinit for debugging via gdb_agent_console

Part Number: RM46L852

I am trying to debug with gdb_agent_console. When i try to use my generic gdbinit i see message "command unsupported"

My gdbinit is 

target extended localhost:55000

monitor reset halt

load

monitor reset init

also i try set breakpoint via 

break
and also see "unsupported".
I use arm-none-eabi toochain. I have seen wiki page about gdb_agent_console , but it is not contain any usefull info.