LayerscapeのトピックRe: LS1043a U-Boot LPUART Peripheral

LS1043a U-Boot LPUART Peripheral

zach_ferree — Thu, 20 Feb 2020 15:56:39 GMT

How do I Enable LPUART's 1 and 2 so I can use them to talk to some peripherals in U-Boot.

I tried enabling the Freescale LPUART support in my defconfig using make menuconfig but now I get compile errors saying that I have undefined references to devfdt_get_addr so i tried enabling fdt_serial and updating my .dts to enable the lpuarts but i am still getting the same build errors with no change.

Re: LS1043a U-Boot LPUART Peripheral

yipingwang — Fri, 21 Feb 2020 05:33:47 GMT

Hello Zach Ferree,

Please refer to configs/ls1043aqds_lpuart_defconfig

Please define the following in u-boot configuration file.

CONFIG_FSL_LPUART=y

CONFIG_SYS_EXTRA_OPTIONS="LPUART"

CONFIG_DEFAULT_DEVICE_TREE="fsl-ls1043a-qds-lpuart"

For dts configuration, please refer to arch/arm/dts/fsl-ls1043a-qds-lpuart.dts

/dts-v1/;

#include "fsl-ls1043a-qds.dtsi"

/ {

chosen {

stdout-path = &lpuart0;

};

Thanks,

Yiping

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Fri, 21 Feb 2020 12:54:04 GMT

In this case i am not using lpuart0 as stdout, i am using it to communicate with a peripheral device, does that change anything?

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Fri, 21 Feb 2020 13:02:35 GMT

yipingwang‌

I did what you suggested and I am still getting the following compile time error.

"build/workspace/sources/u-boot-qoriq/drivers/serial/serial_lpuart.c:417: undefined reference to `devfdt_get_addr'"

do you have any sugesstions on how to fix this?

do I need to enable FDT_SERIAL in the defconfig? am I missing a dependency in one of my .conf files?

Re: LS1043a U-Boot LPUART Peripheral

yipingwang — Mon, 24 Feb 2020 03:42:54 GMT

Hello Zach Ferree,

Which version LSDK are you using now? Would you please send your modified configuration file

to me to do more verification?

Thanks,

Yiping

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Mon, 24 Feb 2020 13:30:53 GMT

Yiping,

I am using 19.04 of the LSDK

see attached for the modified copy of the defconfig I am using

Re: LS1043a U-Boot LPUART Peripheral

yipingwang — Wed, 26 Feb 2020 06:52:03 GMT

Hello Zach Ferree,

Is it possible to use NOR flash u-boot? If yes, please create u-boot configuration file based on the attached configuration file.

Thanks,

Yiping

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Wed, 26 Feb 2020 13:34:26 GMT

Yiping,

Unfortunately I am unable to use NOR flash as I am developing a board with only MMC.

Do you think the issue has to do with using UART0 as the serial interface with the SYS_NS16550 driver along side the FSL_LPUART driver?

Do you know if the SYS_NS16550 driver is using the device tree model or the older model?

Thanks,

Zach

Re: LS1043a U-Boot LPUART Peripheral

yipingwang — Thu, 27 Feb 2020 05:38:14 GMT

Hello Zach,

SYS_NS16550 driver is used , if enable CONFIG_SPL_SERIAL_SUPPORT in the configuration file.

Thanks,

Yiping

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Thu, 27 Feb 2020 13:08:13 GMT

Yiping,

I am still having issues compiling with that enabled.

The compiler error I am getting is

"u-boot-qoriq/drivers/serial/serial_lpuart.c:417: undefined reference to `devfdt_get_addr'"

I believe this to be a linker error, do you know how to verify that the compiler is using the correct "built-in.o" files when linking?

devfdt_get_addr is defined in drivers/core/fdtaddr.c and that is always compiled according to drivers/core/Makefile.

Thanks,

Zach

Re: LS1043a U-Boot LPUART Peripheral

yipingwang — Mon, 02 Mar 2020 04:27:49 GMT

Hello Zach,

Please define the following options in u-boot configuration file.

CONFIG_FSL_LPUART=y
CONFIG_SPL_DM=y
CONFIG_SPL_OF_LIBFDT=y
CONFIG_SPL_OF_CONTROL=y

Thanks,

Yiping

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Mon, 02 Mar 2020 14:09:22 GMT

Yiping,

Adding the config items you listed to my configuration caused the following compile time error

"/u-boot-qoriq/env/mmc.c:42: undefined reference to `blk_get_device_by_str'"

taking a look at what file has the definition for blk_get_device_by_str i found that it was disk/part.c

in order to get that compiling into the image i need to define CONFIG_PARTITIONS in my defconfig, the odd part is that it is already in my defconfig and i was able to confirm that it was getting compiled by adding a "#error" right above the definition of blk_get_device_by_str. so there is some issue where it is getting built but the linker is unable to link it.

Any suggestions?

thanks,

Zach

Re: LS1043a U-Boot LPUART Peripheral

yipingwang — Tue, 03 Mar 2020 04:08:54 GMT

Hello Zach,

Please disable CONFIG_SPL_OF_CONTROL=y in u-boot configuration file.

Thanks,

Yiping

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Tue, 03 Mar 2020 13:13:23 GMT

Yiping,

I disabled CONFIG_SPL_OF_CONTROL in my u-boot configuration file.

i get an undefined reference error of the following "u-boot-qoriq/drivers/mmc/fsl_esdhc.c:1390: undefined reference to `fdtdec_get_int'"

Taking a look at the Makefile in the lib folder it should be either the CONFIG_FIT or the CONFIG_SPL_OF_CONTROL define that makes fdtdec_common.c get compiled. CONFIG_FIT will do it only if CONFIG_SPL_BUILD is not defined, I do not have CONFIG_SPL_BUILD defined in my defconfig so it should be compiling fdtdec_common.

putting in a #error does cause a compile time error so it is getting compiled but it seems to not be getting linked.

Thanks,

Zach

Re: LS1043a U-Boot LPUART Peripheral

zach_ferree — Tue, 10 Mar 2020 18:47:29 GMT

yipingwang‌,

do you have anything else for me to try to get the ability to use the lpuart's while having UART0 as my console?

Thanks,

Zach