For example, I found this git.denx.de Git - u-boot.git/commitdiff
Then how can I find the patch it described.
Freescale offers Linux SDK 1.5 for QorIQ processors (http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=SDKLINUX&fsrch=1). Documentation for kernel and u-boot for this SDK is available on the following page (http://www.freescale.com/infocenter/index.jsp?topic=%2FQORIQSDK%2F2880375.html).
This workaround is implemented in the u-boot for this SDK.
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Yes, I know that. How can I find the patch code?
You can download patch from here:
Does this help?