RTX resetart program

The problem is that during program initialize, I initialize RTX OS (by calling to RTX function os_start_system), os_start_system restart the program and by doing so create endless loop.

I know that this problem relate to code banking since without code banking the program work fine.
In order to implement code banking I do the following:

1) In Option for Target windows I select Target tab
sheet and check Code Banking checkbox, specify 4
Banks and Bank Area from 0x8000 to 0xFFFF.

2) Add L51_BANK.A51 file to the project and define
?B_NBANKS EQU 4
?B_RTX EQU 1

3) In the file STARTUP.A51, uncomment the lines
EXTRN CODE (?B_SWITCH0)
CALL ?B_SWITCH0 ; init bank mechanism to code bank 0

4) In the file Rtxsetup.inc,
set ?RTX_BANKSWITCHING EQU 1

5) In the Project window specify two source file
compile in bank No. 2.

6) Change Hex file format to Hex-386.

Thanks in advance

The problem is that during program initialize, I initialize RTX OS (by calling to RTX function os_start_system), os_start_system restart the program and by doing so create endless loop.

I know that this problem relate to code banking since without code banking the program work fine.
In order to implement code banking I do the following:

1) In Option for Target windows I select Target tab
sheet and check Code Banking checkbox, specify 4
Banks and Bank Area from 0x8000 to 0xFFFF.

2) Add L51_BANK.A51 file to the project and define
?B_NBANKS EQU 4
?B_RTX EQU 1

3) In the file STARTUP.A51, uncomment the lines
EXTRN CODE (?B_SWITCH0)
CALL ?B_SWITCH0 ; init bank mechanism to code bank 0

4) In the file Rtxsetup.inc,
set ?RTX_BANKSWITCHING EQU 1

5) In the Project window specify two source file
compile in bank No. 2.

6) Change Hex file format to Hex-386.

Thanks in advance