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nusbrd: pass $usbdebug to nusb/usbd

This can be usefull for debugging usb enumeration issues from boot,
if one has the chance to pass parameters on the bootloader.

It was initially suggested in a troubleshooting session todo as
a quick modification, but it can be usefull in general.

--- a/sys/man/8/plan9.ini

+++ b/sys/man/8/plan9.ini

@@ -448,7 +448,7 @@

 To avoid the prompt, the

 .I password

 can be specified with the boot parameter above.

-.SS \fLwpaopts=\fivalue\fP

+.SS \fLwpaopts=\fIvalue\fP

 Pass

 .I value

 as additional options to

@@ -956,6 +956,14 @@

 .IR nusbrc (8)

 will use the dynamically assigned usb device address to name

 usb devices instead of the device unique name.

+.SS \fLusbdebug=\fIvalue\fP

+When defined, pass

+.I value

+as arguments to

+.IR usbd (4).

+Usually used to pass

+.B -d

+flags for verbose debug printing.

 .SS VIDEO

 .SS \fL*nocga=\fP

 This inhibits the kernel and

--- a/sys/src/9/boot/nusbrc

+++ b/sys/src/9/boot/nusbrc

@@ -5,7 +5,7 @@

 mkdir -p -m 700 '#σc/usb'

 mkdir -p -m 700 '#σc/usbnet'

-if(! nusb/usbd)

+if(! nusb/usbd $usbdebug)

 	exit

 @{

-- 

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