iMX8MM USB support?

[Tommaso Merciai]

Hi All,
In these days I'm working on SDP_SPL support on iMX8MM, thanks to Tim
that guide me over the following patches:

https://patchwork.ozlabs.org/project/uboot/list/?series=251796&state=*

I'm able to reach the goal to boot U-Boot 2022.04-rc3 over SDP from
SPL. I would like to suggest that at the current state of the project you need 
to add also the following configs:

CONFIG_SPL_USB_HOST=y
CONFIG_SDP_LOADADDR=0x40400000

Using that I'm able to boot the U-Boot 2022.04-rc3 with the following
.lst file:

sudo uuu file.lst

file.lst
------------------------------------------------------------------------
uuu_version 1.2.39

# This command will be run when i.MX6/7 i.MX8MM, i.MX8MQ
SDP: boot -f flash.bin

# These commands will be run when use SPL and will be skipped if no spl
# if (SPL support SDPV)
# {
SDPV: delay 1000
SDPV: write -f flash.bin  -skipspl -offset 0x0
SDPV: jump
# }

FB: done
------------------------------------------------------------------------

I hope this can help some other person.

Regards,
Tommaso

On Wed, Mar 09, 2022 at 11:52:47AM +0100, Michael Nazzareno Trimarchi wrote:
> Hi
> 
> Adding Tommaso
> 
> On Fri, Apr 10, 2020 at 8:37 PM Tim Harvey <tharvey at gateworks.com> wrote:
> >
> > On Thu, Apr 9, 2020 at 2:45 PM Tim Harvey <tharvey at gateworks.com> wrote:
> > >
> > > 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?
> > >
> >
> > Frieder,
> >
> > My issue was that I forgot to set ATF_LOAD_ADDR=0x920000!
> >
> > So I'm running now, booting imx8mm-evk via SDP using your USB patches
> > and imx_usb configuration.
> >
> > Thank you for your help!
> >
> > Tim
> 
> 
> Michael
> 
> -- 
> Michael Nazzareno Trimarchi
> Co-Founder & Chief Executive Officer
> M. +39 347 913 2170
> michael at amarulasolutions.com
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> 
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-- 
Tommaso Merciai
Embedded Linux Developer
tommaso.merciai at amarulasolutions.com
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