How to port Yocto U-boot and Linux distro to custom board equipped with SC572 chip

Hi Yan,

You can add conf file for you custom board like below

github.com/.../machine

and also specify the image names

github.com/.../images

Please let me know if you need more information.

Thanks
Vignesh R

Hi Vignesh, Thanks for your reply.

I have a couple of follow up questions:

For adsp-sc573-ezkit.conf

The option UBOOT_MACHINE references sc573-ezkit_defconfig. I had found that file in the repo u-boot-sharc under configs folder. I had tried to edit the options as follows:

• u-boot-sharc/configs/sc573-ezkit_defconfig
  • CONFIG_TARGET_SC573_EZKIT=y
• u-boot-sharc/include/configs/sc573-ezkit.h
  • #define CONFIG_BOOTCOMMAND "run nc"
  • #define CONFIG_ENV_SPI_BUS 1

Afterwhich I tried to rebuild via both yocto and make but none of the changes took effect. Commands used:

Make in dir ~/yocto_sc573/build/tmp/work/adsp_sc573_ezkit-poky-linux-gnueabi/u-boot-adi/1.0+gitAUTOINC+c372d6cadd-r0/git

• make distclean
• make menuconfig or ARCH=arm make defconfig KBUILD_DEFCONFIG=sc573-ezkit_defconfig
• make

bitbake in root dir

• bitbake -f -c compile u-boot-adi
• bitbake u-boot-adi

Can you please advise in more detail the process to edit u-boot configs?

Cheers,
Yan

Hi Yan,

I follow the below steps to add configs to u-boot and compile it.

You can add the config token to the below defconfig

build/tmp/work/adsp_sc573_ezkit-poky-linux-gnueabi/u-boot-adi/1.0+gitAUTOINC+c372d6cadd-r0/git/configs/sc573-ezkit_defconfig

and recompile the u-boot with the below command
bitbake u-boot-adi -f -c compile

you should see the config token updated in the below .config
build/tmp/work/adsp_sc573_ezkit-poky-linux-gnueabi/u-boot-adi/1.0+gitAUTOINC+c372d6cadd-r0/build/.config

Then you can install the files to the output directory
bitbake u-boot-adi -f -c deploy

If you want from scratch you can do as follows
bitbake u-boot-adi -c cleansstate
bitbake u-boot-adi -c patch

Do the modifications

bitbake u-boot-adi -f -c compile
bitbake u-boot-adi -f -c deploy / bitbake u-boot-adi

Thanks
Vignesh R

Hi Vignesh,

Thanks for getting back to me with the steps for modification. 

I have found that the environment variables in U-boot don't get updated when I try and reflash the new u-boot image. I have been following the instructions outlined here to reflash it (Installing U-boot), is there another method of flashing that ensures existing environment variables get overwritten? Otherwise, is there a way to wipe the flash clean so that I can flash the u-boot image as if it's a new chip?

Cheers,
Yan 

Hi Vignesh,

Thanks for getting back to me with the steps for modification. 

I have found that the environment variables in U-boot don't get updated when I try and reflash the new u-boot image. I have been following the instructions outlined here to reflash it (Installing U-boot), is there another method of flashing that ensures existing environment variables get overwritten? Otherwise, is there a way to wipe the flash clean so that I can flash the u-boot image as if it's a new chip?

Cheers,
Yan 

Hi Vignesh, just an update on the question above. I've figured it out. Need to edit sc573-ezkit.h in include/configs and make the following changes

---

#define CONFIG_ENV_IS_IN_SPI_FLASH

#undef CONFIG_ENV_IS_IN_SPI_FLASH

#define CONFIG_ENV_IS_NOWHERE

---

then rebuild following the steps outlined by you earlier.

Thanks for the help!