Chapter “12.0 WLAN / BT (INTEGRATED) – JETSON TX2 ONLY” of the official document <<JetsonTX2_Series_OEM_Product_Design_Guide.pdf>> said “The UART interface is multiplexed and either route
these to the WLAN/BT device or to the connector pins for use on the carrier board. The default selection for the multiplexers is to the WLAN/BT device.”;
and In Chapter “13.3 UART”, it said "One of the UARTs is used for the WLAN/BT on Jetson TX2 or as
UART3 at the connector depending on the setting of a multiplexor. ";
so i think UART3 can be selected as a UART , not WLAN;
is it possible to select UART3 as a UART(not used for WLAN)?
if it’s possible, how to change UART3 from WLAN to a UART?
Hi WayneWWW, thanks for your reply.
I am using the rel-28.2.1; i found the “wifi_over_pcie” under gpio@2200000, but it looks like already “disabled”; can you teach me how to toggle the property in detail?
The output of the cmd “cat gpio” when the dts is “output-low”:
GPIOs 320-511, platform/2200000.gpio, tegra-gpio:
gpio-381 ( |reset_gpio ) out lo
gpio-412 ( |vdd-usb0-5v ) out lo
gpio-413 ( |vdd-usb1-5v ) out lo
gpio-420 ( |eqos_phy_reset ) out hi
gpio-421 ( |eqos_phy_intr ) in hi
gpio-424 ( |wlan_pwr ) out lo
gpio-426 ( |cam1-pwdn ) out lo
gpio-441 ( |hdmi2.0_hpd ) in lo
gpio-444 ( |wp ) in hi
gpio-445 ( |cd ) in hi
gpio-446 ( |en-vdd-sd ) out lo
gpio-456 ( |cam0-pwdn ) out lo
gpio-457 ( |cam1-rst ) out lo
gpio-460 ( |wifi-over-pcie ) out lo
gpio-461 ( |cam0-rst ) out lo
gpio-479 ( |external-connection:) in hi
gpio-484 ( |bt_ext_wake ) out hi
then i changed “output-low” to “output-high”, the output of cmd is:
GPIOs 320-511, platform/2200000.gpio, tegra-gpio:
gpio-381 ( |reset_gpio ) out lo
gpio-412 ( |vdd-usb0-5v ) out lo
gpio-413 ( |vdd-usb1-5v ) out lo
gpio-420 ( |eqos_phy_reset ) out hi
gpio-421 ( |eqos_phy_intr ) in hi
gpio-424 ( |wlan_pwr ) out hi
gpio-426 ( |cam1-pwdn ) out lo
gpio-441 ( |hdmi2.0_hpd ) in hi
gpio-444 ( |wp ) in hi
gpio-445 ( |cd ) in hi
gpio-446 ( |en-vdd-sd ) out lo
gpio-456 ( |cam0-pwdn ) out lo
gpio-457 ( |cam1-rst ) out lo
gpio-460 ( |wifi-over-pcie ) out hi
gpio-461 ( |cam0-rst ) out lo
gpio-479 ( |external-connection:) in lo
gpio-484 ( |bt_ext_wake ) out hi