Porting i.MX8MM EVK u-boot

[dpog]

I'm currently trying to port the i.MX8MM eval kit to our custom board. Previously we customized the evalkits board files, but we want to use our own files. I followed this thread: Solved: U-boot porting for custom board based on imx8M nan... - NXP Community and the Image builds without problems. I also changed the UART from 2 to 3, changing the dts, imx8mm_evk2.h & .c and set 

SERIAL_CONSOLES = "115200;ttymxc2"

ATF_BOOT_UART_BASE = "0x30880000"

When I startup uuu to flash the uboot into the eMMC I can see the uboot starting up, but when the uboot says "Jump", it is stuck, right after loading the ATF. The U-Boot log is as follows:

U-Boot SPL 2023.04-lf_v2023.04+gab302f5d784 (Sep 21 2023 - 07:40:06 +0000)
DDRINFO: start DRAM init
DDRINFO: DRAM rate 3000MTS
DDRINFO:ddrphy calibration done
DDRINFO: ddrmix config done
Boot
Trying to boot from USB SDP
SDP: initialize...
SDP: handle requests...
Downloading file of size 1956600 to 0x40400000... done
Jumping to header at 0x40400000
Header Tag is not an IMX image
Found header at 0x4042c3a0
NOTICE: Do not release JR0 to NS as it can be used by HAB
NOTICE: BL31: v2.8(release):android-13.0.0_2.0.0-0-ge4b2dbfa5-dirty
NOTICE: BL31: Built : 06:14:17, Jun 2 2023

I'm using the NXP L6.22 BSP

[Sanket_Parekh]

Hi @dpog 

I hope you are doing well.

Please share the custom MACHINE configuration file of Yocto and u-boot configuration for further debugging.

Please make sure that you have referred to the below post.

BL31 not loading on Kirkstone

This issue seems to be due to U-boot not finding the env variable for the serial console.

Thanks & Regards,

Sanket Parekh

[dpog]

The machine file looks as follows:

require conf/machine/imx8mm-lpddr4-evk.conf

IMAGE_FSTYPES += "wic.gz"

UBOOT_DTB_NAME = "imx8mm-eva-mi.dtb"
UBOOT_CONFIG_BASENAME = "imx8mm_eva_mi"

KERNEL_DEVICETREE = "\
freescale/imx8mm-eva-mi.dtb \
"

# fix vim / vim-tiny build error on XWayland
PACKAGECONFIG:remove_pn-vim = "${@bb.utils.contains('DISTRO_FEATURES', 'wayland x11', 'x11', '', d)}"
PACKAGECONFIG:remove_pn-vim-tiny = "${@bb.utils.contains('DISTRO_FEATURES', 'wayland x11', 'x11', '', d)}"

SERIAL_CONSOLES = "115200;ttymxc2"
ATF_BOOT_UART_BASE = "0x30880000"
TEE_LOAD_ADDR = "0x7e000000"

I got it working again by setting #define CFG_MXC_UART_BASE back to UART_BASE_ADDR(2), build the u-boot, set it again to ...(3), now its stuck at "Starting Kernel....", but thats a different problem

[LiLy505]

Hello ,Now I have the same problem as you, but it doesn't work for me to use your method. Do you change anything else?

Thanks

[Sanket_Parekh]

Hi @dpog,

I hope you are doing well.

I got it working again by setting #define CFG_MXC_UART_BASE back to UART_BASE_ADDR(2), building the u-boot, set it again to ...(3), now it's stuck at "Starting Kernel....", but thats a different problem

=> Can you please specify how you are trying to change UART from 2 to 3 after the build?

Please provide me with u-boot defconfig, a board header file (include/configs/*.h), and output of printenv to debug this issue further.

Please also share imx8mm-eva-mi.dtb

One can send it over email if the above information is proprietary.

Thanks & Regards,

Sanket Parekh

[dpog · Accepted solution]

Hi Sanket,
I meant, that I did a rebuild, after changing CFG_MXC_UART_BASE again back to UART_BASE_ADDR(3). After that it worked, seems that devtool didn't recognize the changes the first time. The dtb, defconfig and board header are merely a copy from the imx8mm_evk.

It is now working as it is supposed to.