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This avoids the need to read the vblock off the stateful partition to re-construct the right SSD install kernel. The recovery installer can also perform its verification checks (e.g. rollback to old version) by directly reading kernel partition B instead of re-constructing it by mounting the stateful partition. We still copy the SSD vblock on the stateful for tools that still use them (by overwriting the SSD kernel vblock). That operation is basically a no-op now. This unnecessary step will be removed from the tools as part of separate CLs. BUG=chromium-os:8378, chrome-os-partner:3309 TEST=signed a new recovery image, made sure it installs Change-Id: Ic4308fba1355f67a3b2821ae7e8d438bf658b0d1 Reviewed-on: http://gerrit.chromium.org/gerrit/1648 Tested-by: Gaurav Shah <gauravsh@chromium.org> Reviewed-by: Will Drewry <wad@chromium.org>