Revert "fix build and update ramdisks"

This reverts commit 81c5bf837359da1655f0a609f7e9dd74d3985eb9.
Revert "Merge remote-tracking branch 'remotes/kt/tw' into jb"

This reverts commit 550bf5ec087fdd67d243692e4166ff328fb9fbed, reversing
changes made to 8a25b37422d8be0f56a02d880002141d60dc638e.
update ramdisks