imx95 SDP support?

[Tim Harvey]

On Thu, Jul 3, 2025 at 4:24 AM Alice Guo (OSS) <alice.guo at oss.nxp.com> wrote:
>
> Hi Tim,
>
> I do not know the reason for the problems you met and will try to enable imx95 SDP recently. USB 2.0 can also be used.
>

Hi Alice,

I eventually got SDP working on i.MX95 USB3 DWC3. It turns out I did
need to put the TCA block into system configuration mode otherwise the
USB PHY would not link which was my issue. I'll submit a patch that
enables initial i.MX95 support for phy-imx8mq-usb.c next week. It at
least gets the USB3 controller working in device mode, but host mode
will present difficulties as we will need a way to communicate with a
TCPM to configure the XBar for a Type-C connector orientation.
Additionally for the imx95-evk we would need a PTN5110P driver to be
able to enable VBUS and determine the Type-C plug orientation.

I was also able to verify i.MX95 USB2 EHCI in host mode as well as
gadget mode (by setting its dr_mode to peripheral and adding support
for role determination which I sent a patch for) and everything worked
fine there yet when booting over SDP I still am hanging after the ATF
BL31 prints after loading U-Boot proper via SDP for some reason.

Best Regards,

Tim

> Best Regards,
> Alice Guo
>
> > -----邮件原件-----
> > 发件人: Tim Harvey <tharvey at gateworks.com>
> > 发送时间: 2025年7月3日 9:16
> > 收件人: Alice Guo (OSS) <alice.guo at oss.nxp.com>
> > 抄送: u-boot <u-boot at lists.denx.de>; Fabio Estevam <festevam at gmail.com>
> > 主题: Re: imx95 SDP support?
> >
> > On Tue, Jul 1, 2025 at 8:42 PM Alice Guo (OSS) <alice.guo at oss.nxp.com> wrote:
> > >
> > > Hi Tim,
> > >
> > > i.MX95 BOOTROM is on M33 so that cannot call boot ROM API.
> > >
> >
> > Hi Alice,
> >
> > This makes sense - I forgot that the BOOTROM for the imx95 is on the M33.
> >
> > > The difference between imx8mm BOOTROM and imx8mp/mn BOOTROMv2 is
> > that
> > > BOOTROMv2 can call ROM API to load and imx8mm BOOTROM has no such
> > > function. No need to add USB support to imx8mp and imx8mn SPL.
> > >
> > > When you add USB support to i.MX95 SPL, have you increased the size of
> > > i.MX95 SPL? i.MX95 SDP uses USB3 which driver is in drivers/usb/dwc3/.
> > > Configure USB to gadget. The USB phy driver uses
> > > drivers/phy/phy-imx8mq-usb.c. i.MX95 has tca mux so that it is needed to add
> > code in the USB phy driver.
> >
> > When I add USB, SPL_USB_GADGET, and SPL_USB_DWC3_GENERIC the build
> > fails:
> > aarch64-linux-ld.bfd: u-boot-spl section `.data_save' will not fit in region `.sram'
> > aarch64-linux-ld.bfd: region `.sram' overflowed by 8936 bytes
> > make[2]: *** [scripts/Makefile.xpl:542: spl/u-boot-spl] Error 1
> > make[1]: *** [/home/tharvey/catalina/uboot/Makefile:2127:
> > spl/u-boot-spl] Error 2
> > make: *** [Makefile:186: sub-make] Error 2
> >
> > There's no default SPL_SIZE_LIMIT set so the size here would be a linker config
> > somewhere.
> >
> > I can disable MMC support to shrink things down enough however.
> >
> > I see the TCA configuration you are referring to in Linux [1] but that's all about
> > USB 3.0 pairs and SDP just requires USB 2.0 so I doubt that's needed. Regardless
> > I've attempted to implement it in case that's an issue.
> >
> > If allow PHY_IMX8MQ_USB to be built for IMX95 I can get to the following with
> > some debugging added:
> > Normal Boot
> > spl_boot_device
> > get_boot_device
> > get_boot_device boot_type=14 boot_instance=3 get_boot_device
> > BT_DEV_TYPE_USB boot_dev=17 spl_board_boot_device 17
> > spl_board_boot_device USB_BOOT (usb3.0: J8 Type-C USB) Trying to boot from
> > USB SDP dwc3_glue_probe usb at 4c010010 dwc3_generic_peripheral_probe
> > usb at 4c100000 dwc3_generic_probe usb at 4c100000 imx8mq_usb_phy_probe
> > phy at 4c1f0040 tca_blk_init 0x4c1fc000 spl_sdp_load_image calling
> > board_usb_init spl_sdp_load_image calling g_dnl_clear_detach
> > spl_sdp_load_image calling g_dnl_register
> > sdp_add: cdev: 93203dd0 gadget: 932002b0 gadget->ep0: 93200dc0
> > spl_sdp_load_image calling sdp_init
> > SDP: initialize...
> > dwc3_gadget_interrupt link change
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > dwc3_gadget_interrupt erratic error
> > ^^^ it spins here without ever getting out of the init phase
> >
> > Any idea what might be missing here?
> >
> > For the board I'm working on I really want to get SDP working on the
> > USB2 interface which on the imx95-19x19-evk routes to the Type-A connector so
> > I've done the following:
> > - add usb2 nodes to imx95.dtsi and imx95-19x19-evk.dtsi
> > - add imx95 support to ehci-mx6 ehci_usb_phy_mode() (I'm assuming the
> > USBNC_PHY_STATUS register is the same as the IMX8MM although its missing
> > from the IMX95 RM)
> > - enable SPL_USB_GADGET, SPL_USB_SDP_SUPPORT, USB_EHCI_MX7, CI_UDC,
> > SPL_NOP_PHY, SDP_LOADADDR
> > - work around the fact that get_boot_device returns QSPI_BOOT when booted
> > from the USB2
> >
> > This gets me a bit further than the USB3 controller path:
> > Normal Boot
> > spl_boot_device
> > get_boot_device
> > get_boot_device boot_type=14 boot_instance=1 get_boot_device
> > BT_DEV_TYPE_USB boot_dev=15 spl_board_boot_device 15
> > spl_board_boot_device (usb2.0: J7 Type-A USB) Trying to boot from USB SDP
> > udc_device_get_by_index index=0 drivers/usb/gadget/ci_udc.c
> > usb_gadget_register_driver ehci_usb_of_to_plat usb at 4c200000
> > ehci_usb_probe usb at 4c200000 ehci_usb_probe usb at 4c200000 ret=0
> > usb_gadget_register_driver usb_setup_ehci_gadget ret=0
> > sdp_add: cdev: 93200790 gadget: 2049b928 gadget->ep0: 2049b9c8
> > SDP: initialize...
> > sdp_set_alt: intf: 0 alt: 0
> > sdp_start_ep: ep:2049ba30 req:93200ad0
> > sdp_start_ep: ep:2049ba98 req:93200bd0
> > w_value: 0x0000 len: 0x0000
> > req_type: 0x20 ctrl->bRequest: 0x0a sdp->state: 0
> > w_value: 0x2200 len: 0x004c
> > req_type: 0x00 ctrl->bRequest: 0x06 sdp->state: 0 sdp_init complete
> > SDP: handle requests...
> > ^^^ at this point SPL SDP enumerates on the host and I use 'uuu flash.bin' again
> > to load U-Boot proper
> > sdp_rx_command_complete: command: 0404, addr: 00000000, cnt: 931840
> > Downloading file of size 931840 to 0x90400000... done Report 3: HAB security
> > ep1in-bulk complete --> 0, 5/5 Report 4: Status ep1in-bulk complete --> 0, 65/65
> > sdp_rx_command_complete: command: 0b0b, addr: 00000000, cnt: 0 Report 3:
> > HAB security ep1in-bulk complete --> 0, 5/5 Jumping to header at 0x90400000
> > Header Tag is not an IMX image Found header at 0x90400000
> > sdp_load_read: sector 0, count 400, buf 93202b90
> > sdp_load_read: sector 2000, count 8800, buf ff000000
> > sdp_load_read: sector a800, count d9000, buf 90200000
> > NOTICE:  BL31: v2.10.0  (release):lf-6.6.52-2.2.0
> > NOTICE:  BL31: Built : 16:06:15, Dec 27 2024 ^^^ hangs here at the end of the
> > ATF
> >
> > Any ideas what this one could be?
> >
> > Best Regards,
> >
> > Tim
> >
> > >
> > > Best Regards,
> > > Alice Guo
> > >
> > > > -----邮件原件-----
> > > > 发件人: Tim Harvey <tharvey at gateworks.com>
> > > > 发送时间: 2025年7月2日 3:50
> > > > 收件人: Alice Guo (OSS) <alice.guo at oss.nxp.com>
> > > > 抄送: u-boot <u-boot at lists.denx.de>; Fabio Estevam
> > > > <festevam at gmail.com>
> > > > 主题: Re: imx95 SDP support?
> > > >
> > > > On Tue, Jul 1, 2025 at 6:07 AM Alice Guo (OSS) <alice.guo at oss.nxp.com>
> > wrote:
> > > > >
> > > > > Hi Tim,
> > > > >
> > > > > i.MX95 needs to enable USB gadget in SPL to load the U-Boot
> > > > > proper. It cannot
> > > > use boot ROM API.
> > > > >
> > > >
> > > > Hi Alice,
> > > >
> > > > This is unfortunate - is the ROM API not going to be usable for the
> > > > imx95 or is support code simply not written yet? I don't really
> > > > understand the difference for example between the imx8mm BOOTROM
> > and
> > > > the imx8mp/mn
> > > > BOOTROMv2 where BOOTROMv2 can use the for SDP which greatly reduces
> > > > the SPL footprint.
> > > >
> > > > Have you been able to configure U-Boot SPL for imx95 SDP? I am
> > > > overflowing .sram codespace when I try to add 'either' support for
> > > > the
> > > > USB2.0 controller or the USB3.0 controller.
> > > >
> > > > Best Regards,
> > > >
> > > > Tim
> > > >
> > > >
> > > > > Best Regards,
> > > > > Alice Guo
> > > > >
> > > > > > -----邮件原件-----
> > > > > > 发件人: Tim Harvey <tharvey at gateworks.com>
> > > > > > 发送时间: 2025年7月1日 8:07
> > > > > > 收件人: u-boot <u-boot at lists.denx.de>; Alice Guo (OSS)
> > > > > > <alice.guo at oss.nxp.com>; Fabio Estevam <festevam at gmail.com>
> > > > > > 主题: imx95 SDP support?
> > > > > >
> > > > > > Hi Alice,
> > > > > >
> > > > > > I'm wondering if you have any notes regarding U-Boot SPL SDP
> > > > > > support for the imx95?
> > > > > >
> > > > > > The SPL boots over SDP just fine but I'm interested in getting
> > > > > > to the next step where the SPL provides SDP support to load U-Boot
> > propper.
> > > > > > I'm not clear if the imx95 uses a similar bootrom to as the imx8
> > > > > > and
> > > > > > imx93 or if this is done over scmi.
> > > > > >
> > > > > > Best Regards,
> > > > > >
> > > > > > Tim