[U-Boot-Users] [PATCH 13/14] Add descriptive text to README file

[Bryan O'Donoghue]

	Signed-off-by: Bryan O'Donoghue <bodonoghue at codehermit.ie>

	modified: README
		Adds some descriptive text to the README describing how to use
		the USB console

---

 README |   53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 53 insertions(+), 0 deletions(-)

0058e358f40cc30d1320c279815dbb801f8e45ae
diff --git a/README b/README
--- a/README
+++ b/README
@@ -862,6 +862,59 @@ The following options need to be configu
 				for differential drivers: 0x00001000
 				for single ended drivers: 0x00005000
 
+- USB Device:
+		Define the below if you wish to use the USB console.
+		Once firmware is rebuilt from a serial console issue the
+		command "setenv stdin usbtty; setenv stdout usbtty" and
+		attach your usb cable. The Unix command "dmesg" should print
+		it has found a new device. The environment variable usbtty
+		can be set to gserial or cdc_acm to enable your device to
+		appear to a USB host as a Linux gserial device or a 
+		Common Device Class Abstract Control Model serial device.
+		If you select usbtty = gserial you should be able to enumerate
+		a Linux host by
+		# modprobe gserial vendor=0xVendorID product=0xProductID
+		else if using cdc_acm you simply setting the environment
+		variable usbtty to be cdc_acm should suffice.
+	
+			CONFIG_USB_DEVICE
+			Define this to build a UDC device
+
+			CONFIG_USB_TTY
+			Define this to have a tty type of device available to
+			talk to the UDC device
+
+			CONFIG_USBD_MANUFACTURER
+			Define this string as the name of your company for
+			- CONFIG_USBD_MANUFACTURER "my company"
+			
+			CONFIG_USBD_PRODUCT_NAME
+			Define this string as the name of your product
+			- CONFIG_USBD_PRODUCT_NAME "acme usb device"
+
+			CONFIG_USBD_VENDORID
+			Define this as your assigned Vendor ID from the USB
+			Implementors Forum. This *must* be a genuine Vendor ID
+			to avoid polluting the USB namespace.
+			- CONFIG_USBD_VENDORID 0xFFFF
+				 
+			CONFIG_USBD_PRODUCTID
+			Define this as the unique Product ID
+			for your device
+			- CONFIG_USBD_PRODUCTID 0xFFFF
+		
+			CFG_CONSOLE_IS_IN_ENV
+			Define this if you want stdin, stdout &/or stderr to
+			be set to usbtty automatically.
+
+			mpc8xx:
+				CFG_USB_EXTC_CLK 0xBLAH
+				Derive USB clock from external clock "blah"
+				- CFG_USB_EXTC_CLK 0x02	
+				
+				CFG_USB_BRG_CLK 0xBLAH
+				Derive USB clock from brgclk
+				- CFG_USB_BRG_CLK 0x04
 
 - MMC Support:
 		The MMC controller on the Intel PXA is supported. To