Hi NXP,
I want to change switch uart4 to A53 and change debug console from uart2 to uart1.
I have referenced these two pages:
https://community.nxp.com/t5/Blogs/How-to-Change-i-MX8MM-evk-Linux-Debug-UART/ba-p/1243938#M40
https://community.nxp.com/t5/i-MX-Processors/IMX8MP-EVK-Change-u-boot-debug-console-UART2-gt-UART1/m...
I follow the patch in link above to modify in, except
+++ rel_imx_5.4.70_2.3.0_uart4/imx-atf/plat/imx/imx8m/imx8mm/include/platform_def.h 2021-03-10 16:57:07.299870347 +0800
/plat/imx/imx8m/imx8mp/platform.mk b/plat/imx/imx8m/imx8mp/platform.mk
Environments:
SW: SDK 5.10.72_2.2.0
HW: imx8mp evk
Build SDK 5.10.72_2.2.0 with core image
$ bitbake core-image-base
Build SDK and install toolcahin
$ bitbake meta-toolchain
Copy imx-atf, u-boot-imx, imx-boot, linux-imx from SDK to outside for building standalone.
For u-boot:
I modify imx-atf and u-boot-imx as attached patch files and build standalone with command:
$ source /opt/fsl-imx-xwayland/5.10-hardknott/environment-setup-cortexa53-crypto-poky-linux
1. build imx-atf
$ unset LDFLAGS
$ make PLAT=imx8mp bl31
2. build u-boot
$ export ARCH=arm64
$ make clean
$ make imx8mp_evk_defconfig
$ unset LDFLAGS
$ make
3. copy files to imx-boot
$ cp imx-atf/build/imx8mp/release/bl31.bin imx-boot/iMX8M
$ cp u-boot-imx/u-boot-nodtb.bin imx-boot/iMX8M
$ cp u-boot-imx/arch/arm/dts/imx8mp-evk.dtb imx-boot/iMX8M
$ cp u-boot-imx/spl/u-boot-spl.bin imx-boot/iMX8M
4. build imx-boot to generate flash.bin
$ export ARCH=arm64
$ make SOC=iMX8MP flash_spl_uboot
5. write flash.bin in sdcard
To write release image in sdcard with uuu first, then write flash.bin with dd command.
$ sudo dd if=imx-boot/iMX8M/flash.bin of=/dev/sdb bs=1k seek=32 conv=sync
For kernel:
I modify linux-imx as attached patch file and build standalone with command:
$ source /opt/fsl-imx-xwayland/5.10-hardknott/environment-setup-cortexa53-crypto-poky-linux
1. build kernel
$ export ARCH=arm64
$ make clean
$ make imx_v8_defconfig
$ make
2. replace Image and dtb in boot partition of sdcard
$ sudo cp linux-imx/arch/arm64/boot/Image /media/<user>/boot
$ sudo cp linux-imx/arch/arm64/boot/dts/freescale/imx8mp-evk.dtb /media/<user>/boot
$ sudo umount /media/<user>/boot
$ sudo umount /media/<user>/root
Finally boot from sdcard:
Connect debug port with micro-usb cable to PC.
Launch four terminals for those four COM ports.
It should boot successfully becase I can see the login terminal in uart1 after power on for a while.
However, I cannot see any debug messages in all the four COM ports.
What cound I miss?
Please help me to make it work correctly.
Best Regards,
