Orange Pi PC: USB Power Setting?

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I have a problem with using two SDR USB adapters. I am using Debian Jessie "mini". When I boot, One of the USB adapters will fail to work. Here is part of the bool log (compare USB 2-0 and  USB 4-0)

1. [2.325082] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
   
2. [2.358126] sunxi-ehci sunxi-ehci.1: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
   
3. [2.372816] sunxi-ehci sunxi-ehci.1: new USB bus registered, assigned bus number 1
   
4. [2.387557] sunxi-ehci sunxi-ehci.1: irq 104, io mem 0xf1c1a000
   
5. [2.410032] sunxi-ehci sunxi-ehci.1: USB 0.0 started, EHCI 1.00
   
6. [2.422891] hub 1-0:1.0: USB hub found
   
7. [2.432796] hub 1-0:1.0: 1 port detected
   
8. <font color="#2e8b57">[2.463189] sunxi-ehci sunxi-ehci.2: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
   
9. [2.477909] sunxi-ehci sunxi-ehci.2: new USB bus registered, assigned bus number 2
   
10. [2.492591] sunxi-ehci sunxi-ehci.2: irq 106, io mem 0xf1c1b000
    
11. [2.520045] sunxi-ehci sunxi-ehci.2: USB 0.0 started, EHCI 1.00
    
12. [2.532406] ehci_irq: highspeed device connect
    
13. [2.543647] hub 2-0:1.0: USB hub found
    
14. [2.553551] hub 2-0:1.0: 1 port detected</font>
    
15. [2.583887] sunxi-ehci sunxi-ehci.3: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
    
16. [2.598538] sunxi-ehci sunxi-ehci.3: new USB bus registered, assigned bus number 3
    
17. [2.613146] sunxi-ehci sunxi-ehci.3: irq 108, io mem 0xf1c1c000
    
18. [2.640045] sunxi-ehci sunxi-ehci.3: USB 0.0 started, EHCI 1.00
    
19. [2.652766] hub 3-0:1.0: USB hub found
    
20. [2.662595] hub 3-0:1.0: 1 port detected
    
21. <font color="#ff0000">[2.692833] sunxi-ehci sunxi-ehci.4: SW USB2.0 'Enhanced' Host Controller (EHCI) Driver
    
22. [2.707424] sunxi-ehci sunxi-ehci.4: new USB bus registered, assigned bus number 4
    
23. [2.722014] sunxi-ehci sunxi-ehci.4: irq 110, io mem 0xf1c1d000
    
24. [2.750044] sunxi-ehci sunxi-ehci.4: USB 0.0 started, EHCI 1.00
    
25. [2.762377] ehci_irq: highspeed device connect
    
26. [2.773475] hub 4-0:1.0: USB hub found
    
27. [2.783235] hub 4-0:1.0: 1 port detected
    
28. [2.793465] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
    
29. [2.820048] ehci_irq: highspeed device disconnect</font>
    
30. [2.835872] sunxi-ohci sunxi-ohci.1: SW USB2.0 'Open' Host Controller (OHCI) Driver
    
31. [2.850085] sunxi-ohci sunxi-ohci.1: new USB bus registered, assigned bus number 5
    
32. [2.864197] sunxi-ohci sunxi-ohci.1: irq 105, io mem 0xf1c1a400
    
33. [2.934462] hub 5-0:1.0: USB hub found
    
34. [2.944266] hub 5-0:1.0: 1 port detected
    
35. [2.974530] sunxi-ohci sunxi-ohci.2: SW USB2.0 'Open' Host Controller (OHCI) Driver
    
36. [2.988804] sunxi-ohci sunxi-ohci.2: new USB bus registered, assigned bus number 6
    
37. [3.003050] sunxi-ohci sunxi-ohci.2: irq 107, io mem 0xf1c1b400
    
38. [3.074475] hub 6-0:1.0: USB hub found
    
39. [3.084463] hub 6-0:1.0: 1 port detected
    
40. [3.114899] sunxi-ohci sunxi-ohci.3: SW USB2.0 'Open' Host Controller (OHCI) Driver
    
41. [3.120042] usb 4-1: new high-speed USB device number 2 using sunxi-ehci
    
42. [3.142703] sunxi-ohci sunxi-ohci.3: new USB bus registered, assigned bus number 7
    
43. [3.157076] sunxi-ohci sunxi-ohci.3: irq 109, io mem 0xf1c1c400
    
44. [3.224470] hub 7-0:1.0: USB hub found
    
45. [3.234501] hub 7-0:1.0: 1 port detected
    
46. [3.265039] sunxi-ohci sunxi-ohci.4: SW USB2.0 'Open' Host Controller (OHCI) Driver
    
47. [3.279622] sunxi-ohci sunxi-ohci.4: new USB bus registered, assigned bus number 8
    
48. [3.294138] sunxi-ohci sunxi-ohci.4: irq 111, io mem 0xf1c1d400
    
49. [3.364469] hub 8-0:1.0: USB hub found
    
50. [3.374597] hub 8-0:1.0: 1 port detected

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However, if I boot the Orange Pi PC and *then* plug in the second USB adapter, it works. I suspect I am seeing a power problem on the USB. Each USB adapter needs more power when first starting and then a little less once running. If both are started at the same time, the total demand on USB is too high.

I saw the same problem on Raspberry Pi. The solution on Raspberry Pi is to edit the boot/config.txt file:

1. max_usb_current=1

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This sets the available current of USB to 1.2A (default is 600mA). During startup, my USB adapters take a little more than 300mA each. For a short time, they exceed the 600mA total limit. On the Raspberry Pi, increasing the available current is enough to make the USB adapters start and work correctly.

Does anyone know if there is a way to increase the available USB current for the Orange Pi PC?

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