Hello Jiachao Zhang,
Please download Linux SDK 2.0 Source and Cache ISOs from Linux® SDK for QorIQ ® Processors|NXP , please install both ISOs "QorIQ Linux SDK v2.0 SOURCE.iso" and "QorIQ Linux SDK v2.0 PPCE6500 Yocto Cache.iso" in the same path.
Go to the folder <installation_path>/QorIQ-SDK-V2.0-20160527-yocto, create the build project and fetch u-boot source, modify and rebuild u-boot.
$ source ./fsl-setup-env -m t2080rdb
Get u-boot source code:
$ bitbake u-boot -c cleansstate
$ bitbake u-boot -c patch
Go to the u-boot source folder build_t2080rdb/tmp/work/t2080rdb-fsl-linux/u-boot-qoriq/2016.09+fslgit-r0/git/ to modify u-boot source code according to your requirement.
Go back to folder build_t2080rdb to rebuild u-boot
$ bitbake u-boot
Have a great day,
TIC
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