Hi,
I have some questions about USBs of the imx8mp:
In the EVK schematic there is a note that says “USB1_DNU, USB2_DNU are not functional, if USB ID function is needed, use common GPIO”.
In the ROM USB boot (download mode), datasheet says:
“
21.7 USB boot
ROM supports both of the USB ports on the chip for boot purposes. Only one port can be
selected as the boot connection. The port that is active first wins the selection.
USB boot in ROM code works as a HID device. ROM takes USB as a normal boot
device. …
”
Thanks.
已解决! 转到解答。
>I have a doubt according to your answer:
>“I suppose the connection for USB boot mode (download mode) is USB 2.0 .. Am I right?
USB 2.0 also can be used. If only USB2.0 is used, USB3.0 signals can be left open.
Best regards
igor
Hi Diego
currently no such known plans
yes
yes
not, ROM serial downloader uses a high-speed USB
yes
yes
Best regards
igor
@igorpadykov thanks for your reply.
I want to use USB2 to connect a USB2.0 HUB via USB2_D_P and USB2_D_N, I do not need USB 3.0 PHY (USB2_TX and USB2_RX). So, USB2 has not chance to enter into download mode.
USB1 will be connected to microUSB AB OTG, so only USB1_D_P and USB1_D_N will be used.
I have a doubt according to your answer:
“I suppose the connection for USB boot mode (download mode) is USB 2.0 .. Am I right?
not, ROM serial downloader uses a high-speed USB”
Thanks and BR.
Diego.
>I have a doubt according to your answer:
>“I suppose the connection for USB boot mode (download mode) is USB 2.0 .. Am I right?
USB 2.0 also can be used. If only USB2.0 is used, USB3.0 signals can be left open.
Best regards
igor