Hmm, I can’t find the updated docs that Igor mentions above.
https://developer.arm.com/support/security-update/latest-news/cache-speculation-issues-update
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0406c/index.html
https://alastairreid.github.io/natural-specs/
https://alastairreid.github.io/ARM-v8a-xml-release/
https://alastairreid.github.io/dissecting-ARM-MRA/
https://alastairreid.github.io/arm-v8_3/
https://developer.arm.com/products/architecture/a-profile/exploration-tools
Firmware Security 
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