topic Re: LS1028 - U-Boot console on LPUART in Layerscape

LS1028 - U-Boot console on LPUART

cguer — Wed, 22 Jun 2022 07:43:34 GMT

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

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

Re: LS1028 - U-Boot console on LPUART

yipingwang — Thu, 23 Jun 2022 10:12:32 GMT

You could use flexbuild_lsdk2004_update_290520 release.

Please refer to the attached u-boot patches.

Re: LS1028 - U-Boot console on LPUART

cguer — Thu, 23 Jun 2022 11:35:31 GMT

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.

Re: LS1028 - U-Boot console on LPUART

yipingwang — Mon, 04 Jul 2022 09:24:11 GMT

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);

Re: LS1028 - U-Boot console on LPUART

cguer — Tue, 23 Aug 2022 07:17:36 GMT

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 !

Re: LS1028 - U-Boot console on LPUART

cguer — Thu, 25 Aug 2022 09:29:49 GMT

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.

Re: LS1028 - U-Boot console on LPUART

cguer — Tue, 06 Sep 2022 09:10:47 GMT

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.

Re: LS1028 - U-Boot console on LPUART

CGW — Thu, 13 Jul 2023 21:01:40 GMT

I would also like to use LPUART1 with ATF.