Custom Board Serial Download Mode For I.MX8MP

Wobaffet — Thu, 13 Apr 2023 08:36:08 GMT

Hello,

I we trying to bring-up our iMX8MP custom board. Our reference board is imx8mp-lpddr4-evk. We'll have only emmc as a flash, and our ram will be 512MB compared to the evk. For the first bring-up we have decided to disable every peripheral other than necessary ones like pmic, usb, uart, ram and pmic.

Our question is, since mpu will be empty at first, it will directly go to serial download mode from usb3_0 with otg1. In the evk board, otg1 is type C and our board has type A and we patched the device tree like below:

&usb3_phy0 { fsl,phy-tx-vref-tune = <0xb>; //taken from usb_1, from evk type A connector specs fsl,phy-tx-preemp-amp-tune = <3>; fsl,phy-tx-vboost-level = <5>; fsl,phy-comp-dis-tune = <7>; fsl,pcs-tx-deemph-3p5db = <0x21>; fsl,phy-pcs-tx-swing-full = <0x7f>; status = "okay"; }; &usb3_0 { /* PHYSICAL PORT */ status = "okay"; dr_mode= "otg"; }; &usb_dwc3_0 { /* CONTROLLER*/ dr_mode = "otg"; hnp-disable; srp-disable; adp-disable; usb-role-switch; role-switch-default-mode = "none"; snps,dis-u1-entry-quirk; snps,dis-u2-entry-quirk; status = "okay"; }; &usb3_phy1 { fsl,phy-tx-preemp-amp-tune = <3>; fsl,phy-tx-vref-tune = <0xb>; status = "disabled"; }; &usb3_1 { status = "disabled"; }; &usb_dwc3_1 { pinctrl-names = "default"; pinctrl-0 = <&pinctrl_usb1_vbus>; dr_mode = "host"; status = "disabled"; };

Do we need to do any other configuration?

Thank you in advance. Best Regards!

Re: Custom Board Serial Download Mode For I.MX8MP

Sanket_Parekh — Sat, 15 Apr 2023 10:17:21 GMT

Hi @Wobaffet ,

I hope you are doing well.

Device tree changes look correct.

Please comment out CONFIG_USB_TCPC=y in u-boot defconfig.

# CONFIG_USB_TCPC=y

Additionally, one can refer to Table 9. USB recommendations and 3.7 USB connectivity and i.MX 8M Plus Hardware Developer’s Guide.

Thanks & Regards,

Sanket Parekh

i.MX ProcessorsのトピックCustom Board Serial Download Mode For I.MX8MP

Custom Board Serial Download Mode For I.MX8MP

Re: Custom Board Serial Download Mode For I.MX8MP