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rockchip:usb: add a simple readme for rockusb

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add a simple readme to introduce rockusb and tell people how to use it

Signed-off-by: Eddie Cai <eddie.cai.linux@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Eddie Cai 2017-12-15 08:17:12 +08:00 committed by Marek Vasut
parent 453c95e01a
commit 1c977772a6
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MAINTAINERS
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@ -493,6 +493,7 @@ M: Eddie Cai <eddie.cai.linux@gmail.com>
S: Maintained
F: drivers/usb/gadget/f_rockusb.c
F: cmd/rockusb.c
F: doc/README.rockusb
VIDEO
M: Anatolij Gustschin <agust@denx.de>

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doc/README.rockusb Normal file
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Rockusb (Rockchip USB protocol)
=====================================================
Overview
--------
Rockusb protocol is widely used by Rockchip SoC based devices. It can
read/write info, image to/from devices. This document briefly describes how to
use Rockusb for upgrading firmware (e.g. kernel, u-boot, rootfs, etc.).
Tools
--------
There are many tools can support Rockusb protocol. rkdeveloptool
(https://github.com/rockchip-linux/rkdeveloptool) is open source,
It is maintained by Rockchip. People don't want to build from source
can download from here
(https://github.com/rockchip-linux/rkbin/blob/master/tools/rkdeveloptool)
Usage
--------
The Usage of Rockusb command is:
rockusb <USB_controller> <devtype> <dev[:part]>
e.g. rockusb 0 mmc 0
On your U-Boot console, type this command to enter rockusb mode.
On your host PC. use lsusb command. you should see a usb device
using 0x2207 as its USB verdor id.
for more detail about the rkdeveloptool. please read the usage.
rkdeveloptool -h
use rkdeveloptool wl command to write lba. BeginSec is the lba on device
you want to write.
sudo rkdeveloptool wl <BeginSec> <File>
to flash U-Boot image use below command. U-Boot binary is made by mkimage.
see doc/README.rockchip for more detail about how to get U-Boot binary.
sudo rkdeveloptool wl 64 <U-Boot binary>
There are plenty of Rockusb command. but wl(write lba) and
rd(reboot) command. These two command can let people flash
image to device.
To do
-----
* Fully support Rockusb protocol