How to enabled the USB 2.0 hub stack present on the common processor board with J7200/J721S2/J784S4 SOM.
The J7200/J721S2/J784S4 has only one USB controller and that is muxed between HUB and TYPE C.
By default, the MUX value is low so only Type C will work.
If you want to enable the HUB instead of Type C you need to change the USB2.0_MUX_SEL value to 1.
In linux you can do so by GPIO hogging.
Below is the dts patch for the J7200 :
3771.0001-Enable-staked-USB2.0.patch
#apply the patch cd <linux_sdk>/board-support/linux-*/ git am 0001-Enable-staked-USB2.0.patch cd ../../ # build the dtb make linux-dtbs #copy the dtb to the sd card cp board-support/<linux-*>/arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dtb /media/xyz/rootfs/boot
The above patch is validated on the 8.0 SDK.
Similar changes need to be done for j784s4 and j721s2.
Patch for J721S2:/cfs-file/__key/communityserver-discussions-components-files/791/6811.0001_2D00_Enable_2D00_USB2.0_2D00_stacked_2D00_in_2D00_j721s2.patch
Patch for j784s4: /cfs-file/__key/communityserver-discussions-components-files/791/1184.0001_2D00_Enable_2D00_stacked_2D00_USB2.0_2D00_on_2D00_j784s4.patch
Regards
Diwakar
