SDK fetch error

I try to build GPT firmware according to http://wiki.t-firefly.com/en/Fir … ux_compile_gpt.html
but at the very end of sync process I receive next:

error: Cannot fetch kernel (GitError: kernel update-ref: fatal: 56b9229b4b31b7f9c8d6951609db43440f8f2631^0: not a valid SHA1

Can someone help me to download this git fully. Should I simply git clone kernel into .repo/projects folder?
And what does -c option for in ‘repo sync -c’ command? https://source.android.com/setup/develop/repo describes only -d -s and -f options for sync

We updated Manifests.git ,now please ‘repo sync -c’ again

You can see the usage of repo sync by running repo help sync. -c in repo sync -c is to fetch only current branch instead of all branches from the remote repository.

Will you please post the result of the following commands?

ls -l .repo/manifest.xml
grep kernel .repo/manifest.xml
repo sync -c kernel

Thanks, now everything is perfect
Below are the outputs:

bender@express:~/project/firefly/linux/linux-sdk$ ls -l .repo/manifest.xml
lrwxrwxrwx 1 bender bender 41 дек 11 20:24 .repo/manifest.xml -> manifests/rk3399/rk3399_linux_release.xml
bender@express:~/project/firefly/linux/linux-sdk$ grep kernel .repo/manifest.xml
  <project name="kernel" revision="ca107b11b4fa532a684cf9a57473bc0703e86472" upstream="stable"/>
bender@express:~/project/firefly/linux/linux-sdk$ ../repo/repo sync -c kernel
Fetching project kernel

作為Amazon相關認證考試大綱的主要供應商,VCESoft的SOA-C03專家一直不斷地提供品質較高的產品,不斷為客戶提供免費線上客戶服務,並以最快的速度更新考試大綱。

It really broadened my horizons. The content in Test C-TB120-2504 questions and answers is comprehensive and offered for free, with your success in mind.

Wenn Sie die CompTIA 220-1202-German (CompTIA A+ Certification Exam: Core 2 (220-1202 Deutsch Version)) Zertifizierungsprüfung bestehen wollen, hier kann ITZert Ihr Ziel erreichen. Wir sind uns im Klar, dass Sie die die 220-1202-German Zertifizierungsprüfung wollen. Unser Versprechen sind die wissenschaftliche und qualitativ hochwertige Prüfungsfragen und Antworten zur 220-1202-German Zertifizierungsprüfung.

最近Nutanix試験に参加する人が多くなっています。どのように試験を準備すべきですか?受験生たちはまず試験センターでNCP-MCA認証試験に関する情報を了解してください。順調にNCP-MCA試験に合格するために、我々の問題集で復習することができます。我々の問題集は的中率が高いですから、あなたのNCP-MCA試験への復習に役立つことができます。