LS1028 - U-Boot console on LPUART

[cguer]

Hello NXP Community,

Context
I'm using ls1028 device. U-Boot and Linux console output use duart1(duart0 on dts).
Now, i would like the console output to be on the lpuart6(lpuart5 on dts).
I'm using U-Boot qoriq 2020.04 

What i've done

• rcw

I've set UART1_SOUTSIN_PMUX to 0b011 to use LPUART6 according datasheet Rev. 0 , 12/2019

• u-boot defconfig

I've set following config to yes:  CONFIG_DM_SERIAL, CONFIG_FSL_LPUART, CONFIG_LPUART.
I've also set CONFIG_SYS_EXTRA_OPTIONS to "LPUART".

• u-boot device tree

I have my own device tree which I include fsl-ls1028a.dtsi. In addition to that, i've changed the status of node to "okay" for the following nodes: &lpuart5 &serial0.
I've done aliases between serial0 and &lpuart5.
I've set also stdout-path to &lpuart5 (under chosen).

Status
After those step, I still don't have console output. 
Any suggestion? Is it possible to have console output on LPUART6?

Thanks in advance  
Kind Regards,
Cguer

[CGW]

I would also like to use LPUART1 with ATF.

[yipingwang]

You could use flexbuild_lsdk2004_update_290520 release.

Please refer to the attached u-boot patches.

[cguer]

Hi @yipingwang,

I really appreciate your fast reply on this subject.

The patches you sent to me are for LPUART1(lpuart0 in dts). What should I do if I want for LPUART6?
Especially the modification done with your patch 0001-board-freescale-ls1028a-mux-changes-for-lpuart.patch concerning QIXIS_READ.

Thank you in advance.

[yipingwang]

The following section is used to modify pins multiplex, if your uart hardware design is the same as the QDS, you could use the following configuration and modify CFG_LPUART_EN.

+    uart = QIXIS_READ(brdcfg[13]);
+    uart &= ~CFG_LPUART_MUX_MASK;
+    uart |= CFG_LPUART_EN;
+    QIXIS_WRITE(brdcfg[13], uart);

[cguer]

Hi,

Just an update to tell that the solution worked by randomly putting this: CFG_LPUART_EN = 0xF5.
Still two opens problems:

- We don't have any ATF logs while using LPUART.
- The solution you gave mention of the #13 register of board configuration in QIXIS. I don't see any documentation that mention this register. The one I have only describe the 8 first register.

Thanks.

[cguer]

Thanks for your help.

But i need more support on this.

You told me to put the following line:
"uart = QIXIS_READ(brdcfg[13]);"

Where is the documentation of the register #13 of BRDCFG?
The documentation i have explain BRDCFG0 to BRDCFG6.

Should I put for lpuart5: CFG_LPUART_EN = 0xF5  ?

Thanks !

[cguer]

Another question,

How to get logs for ATF on LPUART6?
It seems that changing only NXP_UART_ADDR to the CCSR address of LPUART6 isn't enough.