[U-Boot] [PATCH] usb: Add new command to regress USB devices

[Marek Vasut]

On 03/09/2016 01:21 PM, Hans de Goede wrote:
> Hi,
> 
> On 09-03-16 12:28, Marek Vasut wrote:
>> On 03/09/2016 12:22 PM, Rajat Srivastava wrote:
>>> This patch adds a new 'usb regress' command, that can be used to
>>> regress test a USB device. It performs the following operations:
>>>
>>> 1. starts the USB device
>>> 2. performs read/write operations
>>> 3. stops the USB device
>>> 4. verifies the contents of read/write operations
>>>
>>> Sample Output:
>>> => usb regress 81000000 82000000 32m
>>> regressing USB..
>>> starting USB...
>>> USB0:   Register 200017f NbrPorts 2
>>> Starting the controller
>>> USB XHCI 1.00
>>> scanning bus 0 for devices... 2 USB Device(s) found
>>>         scanning usb for storage devices... 1 Storage Device(s) found
>>> USB write: device 0 block # 0, count 65536 ... 65536 blocks write: OK
>>> USB read: device 0 block # 0, count 65536 ... 65536 blocks read: OK
>>> stopping USB..
>>> verifying data on addresses 0x81000000 and 0x82000000
>>> Total of 65536 word(s) were the same
>>>
>>> Signed-off-by: Rajat Srivastava <rajat.srivastava at nxp.com>
>>> Signed-off-by: Rajesh Bhagat <rajesh.bhagat at nxp.com>
>>
>>
>> Does it do anything which cannot be achieved on the command line itself
>> using "usb reset" "usb write" "usb read" "cmp" commands ?
> 
> This seems to be about a reading / writing a usb-disk / usb-storage device.

That's what usb read / usb write commands are for, reading raw data from
USB disk :-)

> I believe this can certainly be achieved with the existing disk io
> commands,
> and moreover this seems quite dangerous (overwriting the partition table on
> the device), so I think requiring the user to do this explicitly indeed
> seems better.

Yeah

> Regards,
> 
> Hans


-- 
Best regards,
Marek Vasut