iMX8MM USB support?

[Tim Harvey]

On Mon, Apr 6, 2020 at 2:43 AM Schrempf Frieder
<frieder.schrempf at kontron.de> wrote:
>
> Hi Tim,
>
> On 01.04.20 19:55, Tim Harvey wrote:
> > Peng,
> >
> > It looks like IMX8MM USB support hasn't made it upstream yet. Is this
> > something your working on?
> >
> > I'm interested in booting an IMX8MM via SDP.
>
> If I remember correctly, the main issue is that the ci_udc driver is
> missing DM support. See here: [1].
>
> I have pulled some patches/hacks into our tree to make SDP work, at
> least without DM [2].
>
> If someone could come up with a proper solution for upstream that would
> be great and I would be happy to review/test.
>
> [1] http://u-boot.10912.n7.nabble.com/DM-for-ci-udc-td368249.html#a370228
> [2] https://git.kontron-electronics.de/linux/u-boot/-/commits/v2020.01-ktn
>

Frieder,

Thanks - this was very helpful! After applying the patches adding
IMX8MM USB I can boot the EVK SPL via SDP and get it to transition
over to providing a gadget at 0525:c4a4 but when I try to load
u-boot.img to that it fails with a header not found error:

sudo ../imx_usb_loader/imx_usb u-boot.imx; sleep 2; sudo
../imx_usb_loader/imx_usb u-boot.img
config file <../imx_usb_loader//imx_usb.conf>
...
vid=0x1fc9 pid=0x0134 file_name=mx8mm_usb_work.conf
...
config file <../imx_usb_loader//mx8mm_usb_work.conf>
parse ../imx_usb_loader//mx8mm_usb_work.conf
Trying to open device vid=0x1fc9 pid=0x0134
Interface 0 claimed
HAB security state: development mode (0x56787856)
== work item
filename u-boot.imx
load_size 0 bytes
load_addr 0x00000000
dcd 1
clear_dcd 0
plug 1
jump_mode 3
jump_addr 0x00000000
== end work item
No DCD table

loading binary file(u-boot.imx) to 007e0fc0, skip=0, fsize=37600 type=aa

<<<226816, 226816 bytes>>>
succeeded (security 0x56787856, status 0x88888888)
jumping to 0x007e0fc0
config file <../imx_usb_loader//imx_usb.conf>
...
config file <../imx_usb_loader//mx8mm_usb_sdp_spl.conf>
parse ../imx_usb_loader//mx8mm_usb_sdp_spl.conf
Trying to open device vid=0x0525 pid=0xc4a4
Interface 0 claimed
HAB security state: development mode (0x56787856)
== work item
filename u-boot.img
load_size 0 bytes
load_addr 0x00000000
dcd 1
clear_dcd 0
plug 1
jump_mode 3
jump_addr 0x00000000
== end work item
header not found 8400:91000694, 4000
do_download failed, err=-22
HAB security state: development mode (0x56787856)

Note I had to add a line to imx_usb.conf to map 0525:c4a4 to
mx8mm_usb_sdp_spl.conf:
diff --git a/imx_usb.conf b/imx_usb.conf
index c7c00f6..4d89230 100644
--- a/imx_usb.conf
+++ b/imx_usb.conf
@@ -17,6 +17,7 @@
 0x066f:0x37ff, linux_gadget.conf
 0x1b67:0x4fff, mx6_usb_sdp_spl.conf
 0x0525:0xb4a4, mx6_usb_sdp_spl.conf
+0x0525:0xc4a4, mx8mm_usb_sdp_spl.conf
 0x1fc9:0x012b, mx8mq_usb_work.conf
 0x1fc9:0x0134, mx8mm_usb_work.conf
 0x1fc9:0x013e, mx8mn_usb_work.conf

Do you know what's missing from u-boot.img?

Best Regards,

Tim