iMX8MM USB support?

[Tim Harvey]

On Thu, Apr 9, 2020 at 3:02 AM Schrempf Frieder
<frieder.schrempf at kontron.de> wrote:
>
> On 08.04.20 17:31, Tim Harvey wrote:
> [...]
> >>
> >> In my case I'm loading a FIT image, so things are a bit different.
> >> Where are you loading the image to?
> >>
> >> I have the following line in mx8mm_usb_sdp_spl.conf to load my FIT image
> >> to DDR and jump to it:
> >>
> >> /path/to/image/u-boot.itb:load 0x40200000, jump_direct 0x40200000
> >>
> >
> > Frieder,
> >
> > I was trying to load u-boot.img
> >
> > The SPL boots fine:
> > U-Boot SPL 2020.01-00029-g5ad7797 (Apr 08 2020 - 08:16:53 -0700)
> > read error from device: 9310b8 register: x!Normal Boot
> > Trying to boot from USB SDP
> > SDP: initialize...
> > SDP: handle requests..
> >
> > But when I 'imx_usb u-boot.img' it complains there is no header on
> > u-boot.img. I enabled FIT generation and attempted to 'imx_usb
> > u-boot.itb' but imx_usb still complains about no header found.
> >
> > My mx8mm_usb_sdp_spl.conf loooks like this:
> > mx8mm_spl_sdp
> > #hid/bulk,[old_header,]max packet size, {ram start, ram size}(repeat
> > valid ram areas)
> > #In SPL, we typically load u-boot.img which has a U-boot header...
> > hid,1024,0x910000,0x40000000,1G,0x00900000,0x40000
> >
> > #0x60000 - 0x8400 = 0x57c00, +0x3000=5ac00 (FIT image)
> > ../u-boot-imx6/u-boot.bin:load 0x40200000
> > ../u-boot-imx6/bl31-iMX8MM.bin:load 0x00920000,jump 0x920000
> >
> > What does your mx8mm_usb_sdp_spl.conf look like? I must admit I don't
> > really understand how these are configured.
>
> It looks just like yours except that I have a single instruction as
> already stated above:
>
> /path/to/image/u-boot.itb:load 0x40200000, jump_direct 0x40200000
>
> and I'm loading the FIT image by running './imx_usb' without arguments.
>
> As imx_usb_loader can't parse FIT image headers, I use 'jump_direct' to
> jump to the raw image entry point and let SPL parse the FIT. I think in
> that case imx_usb_loader shouldn't complain about a missing header.

Frieder,

Ok, I finally understand. Using 'imx_usb <file>' which is what I was
doing is not the same as loading it via the conf file and was why it
was looking for a header.

So now that I'm using the imx_usb.conf files fully instead It's
loading u-boot.itb and jumping but unfortunately I'm still not quite
there.

Here's what I'm seeing:

U-Boot SPL 2020.01-00029-g6529a03-dirty (Apr 09 2020 - 13:02:21 -0700)
Normal Boot
Trying to boot from USB SDP
SDP: initialize...
SDP: handle requests...
Downloading file of size 584020 to 0x40200000... done
Jumping to header at 0x40200000
Header Tag is not an IMX image

Is the 'Header Tag' message normal? From adding some debugging it
appears to matching the dts name in my board_fit_config_name_match and
parsing the FIT image, loading the ATF and jumping but then I get
nothing. What would I expect at this point and do you have any
troubleshooting tips?

Thanks,

Tim