On Thu, Jun 21, 2018 at 7:08 AM Fabio Estevam [off-list ref] wrote:

Hi Andrey,

On Thu, Jun 21, 2018 at 9:47 AM, Andrey Smirnov
[off-list ref] wrote:

quoted

I never assumed it was a regression and that USB worked on RDU1 board
before, so I never tried to see if this was a regression. I can only
tell you that it hangs as soon as any PORTSC registers are accessed.

I think we need to investigate this portsc register hang further.

I just finished experimenting with it on RDU1 and Babbage boards and I
can't reproduce the hang that you describe against 4.18-rc1. At this
point I wonder if it's the bootloader that is a variable that plays
into this. I was booting both boards with 2018.06.0 version of barebox
+ the custom patches that can be found here
https://github.com/ndreys/barebox/commits/rdu1-netboot. Note that the
last patch in that branch/stack was added as a part of this
investigation, but even before it, I was able to boot Linux just fine,
albeit without working USB.

Any chance you can try it on your end and see if that makes a difference?

Thanks,
Andrey Smirnov