[U-Boot] [PATCH V2 08/21] mx6: add plugin file for use with imximage.cfg

[Stefano Babic]

On 24/09/2012 15:48, Eric Nelson wrote:
> Hi Stefano,
> 

Hi Eric,

>> But I do not get the connection with the imximage and the need for the
>> plugin. If the SOC boots with "Serial Downloader", it polls the USB OTG
>> waiting for command as specified in the protocol. With your tool you set
>> the registers you need and you can download the file you want,
>> independently from the structure of the imxImage.
>>
> 
> The relationship is this: if we build a combined SPL image for
> a universal i.MX6 U-Boot, how would it know/decide that it's
> being loaded via USB and how would it support this?
> 
> imx_usb supports plugins, so we can use it directly with that
> approach.

But this seems to me an implementation choice rather a constraint of the
SOC. As I see in your code, imx_usb parses the iMX header making
decisions according to it. Then there is a hard dependency between
imx_usb and u-boot code.

The other way is that they are independently, let's say, openOCD
approach ;-).

imx_usb could get an independent file to configure the DDR controller
(for example, but it is not limited to), and then load a u-boot (or SPL,
or...) where you want. Then there is no strict dependency with the
imx_usb tool. The SOC allows this approach, too.

Best regards,
Stefano

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