[U-Boot] [PATCH 2/2] Add i.MX7D based Meerkat96 board support

[Shawn Guo]

On Mon, Jul 08, 2019 at 02:42:54PM +0530, Manivannan Sadhasivam wrote:
> Hi Shawn,
> 
> Thanks for the patch!
> 
> On Sun, Jul 07, 2019 at 08:59:55PM +0800, Shawn Guo wrote:
> > The Meerkat96 board, based on the NXP i.MX7D SoC, is a member of
> > 96Boards community and complies with all Consumer Edition board
> > specifications.
> > 
> > https://www.novtech.com/products/meerkat96.html
> > https://www.96boards.org/product/imx7-96/
> > 
> > The initial supported/tested devices include:
> >  - Debug serial
> >  - SD
> >  - USB Host (with Ethernet)
> 
> While testing, I encountered below error when starting usb:
> 
> => usb start
> starting USB...
> Bus usb at 30b10000: usb dr_mode not found
> Error enabling VBUS supply
> probe failed, error -38

This is expected, as there are some properties missing from DT for
USBOTG1, and I haven't put effort on it yet.

> Bus usb at 30b20000: data abort
> pc : [<9ffaf574>]          lr : [<9ffaf560>]
> reloc pc : [<87828574>]    lr : [<87828560>]
> sp : 9df7d1b0  ip : 431bde82     fp : 9ff9dc8c
> r10: 00000000  r9 : 9df84ed8     r8 : 00000000
> r7 : 9df865d8  r6 : 9df86578     r5 : 9df87680  r4 : 00000080
> r3 : 00000000  r2 : 0196f7b6     r1 : 31310000  r0 : 00000000
> Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
> Code: 18bd8010 e2841dc2 e2811031 e1a01801 (e5913234) 
> Resetting CPU ...
> 
> resetting ...

It looks the exception comes from USBOTG2 which backs both Host ports on
Meerkat96 board.  I have never seen this in my testing.  Do you have any
USB device connected to the Host port, when this happens?

> 
> Did I miss anything? Sorry, don't have time to debug much...

If you can help me reproduce it on my end, I will debug it.

Shawn