[U-Boot] Help!I cannot open the virtual com port

[kennywin]

I am making usb driver for omap1510  on uboot. When I pluged in the USB port
to PC. It found COM6 (a virtual com port). But When I open the COM6 on
hyper-terminal, it says "Cannot open"


The following traces are from the Bus Hound  

Device  Phase  Data                                               
Description       Cmd.Phase.Ofs(rep)
------  -----  -------------------------------------------------- 
----------------  ------------------
  26.0  CTL    a1 21 00 00  00 00 07 00                            GET LINE
CODING          1.1.0(4)     
  26.0  DI     00 c2 01 00  00 00 08                               .......                 
1.2.0        
  26.0  URB    50 00 08 00  00 00 00 00  40 3a 3a 85  22 00 00 00  CONTROL
TRANSFER         1.3.0        
               58 3a 3a 85  0b 00 00 00  07 00 00 00  f0 ab f5 b9                          
1.3.16       
  26.0  CTL    21 20 00 00  00 00 07 00                            SET LINE
CODING          5.1.0        
  26.0  DO     00 c2 01 00  00 00 08                               .......                 
5.2.0        
  26.0  USTS   04 00 00 c0                                         stall pid               
5.3.0        
  26.0  URB    50 00 08 00  04 00 00 c0  40 3a 3a 85  22 00 00 00  CONTROL
TRANSFER         5.4.0        
               58 3a 3a 85  0a 00 00 00  07 00 00 00  ec ab f5 b9                          
5.4.16       
  26.0  CTL    a1 21 00 00  00 00 07 00                            GET LINE
CODING          6.1.0        
  26.0  DI     00 c2 01 00  00 00 08                               .......                 
6.2.0        
  26.0  URB    50 00 08 00  00 00 00 00  40 3a 3a 85  22 00 00 00  CONTROL
TRANSFER         6.3.0        
               58 3a 3a 85  0b 00 00 00  07 00 00 00  c8 ab f5 b9                          
6.3.16       
  26.0  CTL    a1 21 00 00  00 00 07 00                            GET LINE
CODING          7.1.0(2)     
  26.0  DI     00 c2 01 00  00 00 08                               .......                 
7.2.0        
  26.0  URB    50 00 08 00  00 00 00 00  40 3a 3a 85  22 00 00 00  CONTROL
TRANSFER         7.3.0        
               58 3a 3a 85  0b 00 00 00  07 00 00 00  f0 ab f5 b9                          
7.3.16       
  26.0  CTL    21 20 00 00  00 00 07 00                            SET LINE
CODING          9.1.0        
  26.0  DO     b0 04 00 00  00 00 08                               .......                 
9.2.0        
  26.0  USTS   04 00 00 c0                                         stall pid               
9.3.0        
  26.0  URB    50 00 08 00  04 00 00 c0  40 3a 3a 85  22 00 00 00  CONTROL
TRANSFER         9.4.0        
               58 3a 3a 85  0a 00 00 00  07 00 00 00  ec ab f5 b9                          
9.4.16       
  26.0  CTL    a1 21 00 00  00 00 07 00                            GET LINE
CODING         10.1.0        
  26.0  DI     00 c2 01 00  00 00 08                               .......                
10.2.0        
  26.0  URB    50 00 08 00  00 00 00 00  40 3a 3a 85  22 00 00 00  CONTROL
TRANSFER        10.3.0        
               58 3a 3a 85  0b 00 00 00  07 00 00 00  c8 ab f5 b9                         
10.3.16       
  26.0  CTL    21 22 00 00  00 00 00 00                            SET CTRL
LINE ST        11.1.0        
  26.0  URB    50 00 08 00  00 00 00 00  40 3a 3a 85  20 00 00 00  CONTROL
TRANSFER        11.2.0        
               58 3a 3a 85  0a 00 00 00  00 00 00 00  00 00 00 00                         
11.2.16     


How can I solve this problem?
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