AM6548: Not able to compile uboot in SDK8.2

Thanks keerthy,

My aim is to migrate the SDK to our custom board. I was using sdk 7.1 properly with the changes made in dts files for uboot. but when I migrated the same changes to sdk 8.2 I dont see any log on serial console . 

in sdk 7.1 there was file k3-am654-base-board-u-boot.dtsi where I used to change the serial console details but with sdk 8.2 there is no such file. for temporary I added the patch below into k3-am654-r5-base-board-u-boot.dtsi but this seems to be not working for me. let me know if I am missing anything here. as SDK 7.1 was working properly for me facing issue with SDK 8.2

patch :

diff --git a/arch/arm/dts/k3-am654-base-board-u-boot.dtsi b/arch/arm/dts/k3-am654-base-board-u-boot.dtsi
index cc8668fc32..113efc2104 100644
--- a/arch/arm/dts/k3-am654-base-board-u-boot.dtsi
+++ b/arch/arm/dts/k3-am654-base-board-u-boot.dtsi
@@ -15,7 +15,7 @@
u-boot,dm-spl;
};
aliases {
- serial2 = &main_uart0;
+ serial2 = &main_uart1;
ethernet0 = &cpsw_port1;
};
};
@@ -88,6 +88,14 @@
u-boot,dm-spl;
};

+ main_uart1_pins_default: main_uart1_pins_default {
+ pinctrl-single,pins = <
+ AM65X_IOPAD(0x0174, PIN_INPUT, 6) /* (AE23) UART1_RXD */
+ AM65X_IOPAD(0x014C, PIN_OUTPUT, 6) /* (AD23) UART1_TXD */
+ >;
+ u-boot,dm-spl;
+ };
+
usb0_pins_default: usb0_pins_default {
pinctrl-single,pins = <
AM65X_IOPAD(0x02bc, PIN_OUTPUT, 0) /* (AD9) USB0_DRVVBUS */
@@ -145,6 +153,13 @@
u-boot,dm-spl;
};

+&main_uart1 {
+ u-boot,dm-spl;
+ pinctrl-names = "default";
+ pinctrl-0 = <&main_uart1_pins_default>;
+ status = "okay";
+};
+
&sdhci0 {
u-boot,dm-spl;
};

this patch was developed on sdk 7.1 and was working properly.

Hi Sarfaraz,

Can you confirm that the prints are coming on the MAIN_UART0?
Or you don't have that enabled on your board?

- Keerthy

Hi Keerthy I was missing some changes in dts for ddr time . I made those changes and now it is working. 

1 issue I am facing while booting linux is with the pruss uart 

getting the below logs from pruss

[ 21.471650] pruss8250 b028000.serial: missing irq
[ 21.476413] pruss8250: probe of b028000.serial failed with error -75
[ 21.482971] pruss8250 b128000.serial: missing irq
[ 21.487701] pruss8250: probe of b128000.serial failed with error -75
[ 21.494178] pruss8250 b228000.serial: missing irq
[ 21.498893] pruss8250: probe of b228000.serial failed with error -75

any inputs on this which can help me resolve this error.

Thanks,

Sarfaraz

just to elaborate above query in SDK 7.1 there was separate section in documentation for PRU UART. (3.5.3.4. PRU-ICSS Serial UART)

But in SDK 8.2 there is no such section for PRU UART. Also in SDK 7.1 there were PRU UART 1 and PRU UART2 added in dts files now these entries are not present in SDK 8.2 can you suggest where can I add the entry with example f any for sdk 8.2 also any specific reason this was removed in sdk 8.2 ?

Hi Keerthy Thanks for the inputs no support for non ethernet PRU means what ? will we not be able to use UART and Ethernet at the same time from PRU ? Because this was supported in older SDK 7.1.

We had 2 PRU for ethernets and 1 PRU for uart but now as per your comments I guess we will not be able to use UART on PRU moving ahead. correct if I am wrong.

Thanks again.