topic Re: Building u-boot for a custom imx93 based board in i.MX Processors

Building u-boot for a custom imx93 based board

abt — Tue, 14 May 2024 21:10:01 GMT

I have updated lpddr4x_timing.c and spl.c in the existing board/freescale/imx93_evk u-boot source folder to reflect custom DRAM and PMIC integrations. I was able to build the flash binary file and successfully deploy it on the eMMC storage.

Is there any guidance for creating a custom board configuration for u-boot?
I have been trying to create a separate configuration for the custom board, in the source tree, using the steps outlined below:

cp -R board/freescale/imx93_evk board/freescale/imx93_som cp include/configs/imx93_evk.h include/configs/imx93_som.h cp arch/arm/dts/imx93-11x11-evk.dts arch/arm/dts/imx93-11x11-som.dts cp arch/arm/dts/imx93-11x11-evk-u-boot.dtsi arch/arm/dts/imx93-11x11-som-u-boot.dtsi

Updated board/freescale/imx93_som/Kconfig with this content:

if TARGET_IMX93_11X11_SOM config SYS_BOARD default "imx93_som" config SYS_VENDOR default "freescale" config SYS_CONFIG_NAME default "imx93_som" choice prompt "Select DDR Type" default IMX93_EVK_LPDDR4X if TARGET_IMX93_11X11_SOM config IMX93_EVK_LPDDR4X bool "Using LPDDR4X Timing and PMIC voltage" select IMX9_LPDDR4X help Select the LPDDR4X timing and 0.6V VDDQ config IMX93_EVK_LPDDR4 bool "Using LPDDR4 Timing and PMIC voltage" select IMX9_LPDDR4X help Select the LPDDR4 timing and 1.1V VDDQ endchoice endif

Updated arch/arm/mach-imx/imx9/Kconfig with the following addition:

... config TARGET_IMX93_11X11_SOM bool "imx93_11x11_som" select OF_BOARD_FIXUP select IMX93 ... source "board/freescale/imx93_som/Kconfig" ...

Updated arch/arm/dts/Makefile and added an entry for a custom dts file:

dtb-$(CONFIG_ARCH_IMX9) += \ imx93-11x11-evk.dtb \ imx93-11x11-som.dtb \ imx93-14x14-evk.dtb \ imx93-9x9-qsb.dtb \ imx93-9x9-qsb-ontat-wvga-panel.dtb \ imx91p-11x11-evk.dtb \ imx91p-9x9-qsb-ontat-wvga-panel.dtb \ imx91p-9x9-qsb-spinand.dtb

Updated .config file with the following changes:

29,30c29,30 < CONFIG_SYS_BOARD="imx93_evk" < CONFIG_SYS_CONFIG_NAME="imx93_evk" --- > CONFIG_SYS_BOARD="imx93_som" > CONFIG_SYS_CONFIG_NAME="imx93_som" 195c195 < CONFIG_DEFAULT_DEVICE_TREE="imx93-11x11-evk" --- > CONFIG_DEFAULT_DEVICE_TREE="imx93-11x11-som" 202c202 < CONFIG_TARGET_IMX93_11X11_EVK=y --- > # CONFIG_TARGET_IMX93_11X11_EVK is not set 206,207c206 < CONFIG_IMX93_EVK_LPDDR4X=y < # CONFIG_IMX93_EVK_LPDDR4 is not set --- > CONFIG_TARGET_IMX93_11X11_SOM=y 431c430 < CONFIG_DEFAULT_FDT_FILE="imx93-11x11-evk.dtb" --- > CONFIG_DEFAULT_FDT_FILE="imx93-11x11-som.dtb" 936c935 < CONFIG_OF_LIST="imx93-11x11-evk" --- > CONFIG_OF_LIST="imx93-11x11-som" 938c937 < CONFIG_SPL_OF_LIST="imx93-11x11-evk" --- > CONFIG_SPL_OF_LIST="imx93-11x11-som"

However, I get the following error when trying to make a build:

...
AR spl/fs/built-in.o
LDS spl/u-boot-spl.lds
LD spl/u-boot-spl
aarch64-poky-linux-ld.bfd: board/freescale/imx93_som/spl.o: in function `spl_dram_init':
/home/user/controls/Uboot/user-som/source/board/freescale/imx93_som/spl.c:76: undefined reference to `dram_timing'
aarch64-poky-linux-ld.bfd: /home/user/controls/Uboot/user-som/source/board/freescale/imx93_som/spl.c:76: undefined reference to `dram_timing'
make[2]: *** [/home/user/controls/Uboot/user-som/source/scripts/Makefile.spl:528: spl/u-boot-spl] Error 1
make[1]: *** [/home/user/controls/Uboot/user-som/source/Makefile:2044: spl/u-boot-spl] Error 2
make[1]: Leaving directory '/home/user/controls/Uboot/user-som/artifacts'
make: *** [Makefile:177: sub-make] Error 2
make: Leaving directory '/home/user/controls/Uboot/user-som/source'

Did I miss anything?

Any input appreciated, thanks in advance.

Re: Building u-boot for a custom imx93 based board

abt — Tue, 21 May 2024 18:33:32 GMT

My problem has been solved. I was missing a step.

Re: Building u-boot for a custom imx93 based board

eik3 — Mon, 27 May 2024 15:04:19 GMT

Hi @abt,

What was the missing step?

Thanks in advance.

Re: Building u-boot for a custom imx93 based board

dpog — Fri, 09 Aug 2024 08:37:53 GMT

Hi @abt,
I'm currently stuck at the same problem, do you recall what your missing step was?

Re: Building u-boot for a custom imx93 based board

abt — Fri, 09 Aug 2024 13:09:26 GMT

Here is the missing step in red:

cp -R board/freescale/imx93_evk/ board/freescale/imx93_som
mv board/freescale/imx93_som/imx93_evk.c board/freescale/imx93_som/imx93_som.c
cp include/configs/imx93_evk.h include/configs/imx93_som.h
cp arch/arm/dts/imx93-11x11-evk.dts arch/arm/dts/imx93-11x11-som.dts
cp arch/arm/dts/imx93-11x11-evk-u-boot.dtsi arch/arm/dts/imx93-11x11-som-u-boot.dtsi

I forgot to also mention these changes:

diff --git a/board/freescale/imx93_som/Makefile b/board/freescale/imx93_som/Makefile index b6b978dd..4710b954 100644 --- a/board/freescale/imx93_som/Makefile +++ b/board/freescale/imx93_som/Makefile @@ -4,7 +4,7 @@ # SPDX-License-Identifier: GPL-2.0+ # -obj-y += imx93_evk.o +obj-y += imx93_som.o ifdef CONFIG_SPL_BUILD obj-y += spl.o

Re: Building u-boot for a custom imx93 based board

Victory777 — Mon, 30 Sep 2024 08:00:50 GMT

Hi @abt

I am currently stuck at the same error you got :

aarch64-poky-linux-ld.bfd: board/freescale/imx93_som/spl.o: in function `spl_dram_init':
/home/user/uboot-imx-2023.04-A1/board/freescale/imx93_som/spl.c:78:(.text.spl_dram_init+0xc): undefined reference to `dram_timing'
aarch64-poky-linux-ld.bfd: /home/user/uboot-imx-2023.04-A1/board/freescale/imx93_som/spl.c:78:(.text.spl_dram_init+0x10): undefined reference to `dram_timing'
make[1]: *** [scripts/Makefile.spl:528: spl/u-boot-spl] Error 1

I have added the missing step in red and also updated the Makefile as you have mentionned before but still stuck at the same error.
Is there any other missing step for resolving this error please ?

Re: Building u-boot for a custom imx93 based board

abt — Wed, 02 Oct 2024 15:54:00 GMT

I would try updating some additional variables in .config file as shown below:

CONFIG_DEFAULT_DEVICE_TREE="imx93-som"
CONFIG_OF_LIST="imx93-som"
CONFIG_SPL_OF_LIST="imx93-som"

Regards