Changes between Version 33 and Version 34 of serial

Timestamp:

12/11/2024 06:25:56 PM (11 months ago)

Author:

Ryan Erbstoesser

Comment:

add 7100 example

serial

@@ -105 +105 @@
 ||          ||         || UART3    || ttymxc2  || RS232 J16 ||
 || ||
- 1. Depends on software configuration
+ 1. Depends on software configuration, see below example
  2. UART2/UART3 are configured in early boot firmware via the hwconfig variable (see [wiki:newport/bootloader#serialconfig here). Additionally CN80XX UART2 and UART3 can be steered via software PINSEL via software modification to any of the GPIO signals including the off-board DIO's - contact support@gateworks.com for details
+
+==== GW7100 Serial Port Pin Muxing
+Some SPI lines can be converted to UART on the GW7100 on the J4 header.
+
+J4 pins 7 and 9.
+
+Note of course you have to give up some hardware features that reply on the SPI bus:
+- Make sure U13 TPM is unloaded
+
+To make spi2 uart4 (2-wire UART, no flow control) you could do the following device tree fragment at the bottom of the device-tree (ie can modify imx8mm-venice-gw71xx-0x.dts):
+{{{
+&ecspi2 {
+        status = "disabled";
+};
+
+&uart4 {
+        pinctrl-names = "default";
+        pinctrl-0 = <&pinctrl_uart4>;
+        status = "okay";
+};
+
+&iomuxc {
+        pinctrl_uart4: uart4grp {
+                fsl,pins = <
+                        MX8MM_IOMUXC_ECSPI2_MOSI_UART4_DCE_TX   0x140
+                        MX8MM_IOMUXC_ECSPI2_SCLK_UART4_DCE_RX   0x140
+        >;
+};
+}}}
+
+
+More is discussed here:
+[wiki:venice/DigitalIO]