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authorMichael Ellerman <mpe@ellerman.id.au>2014-06-24 17:17:47 +1000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2014-06-25 13:10:47 +1000
commite2500be2b801f4e95d6a1efbc50af3bf14eeb940 (patch)
tree6bf8042001b33d55bf08927cfa5d0b7a2355b050 /drivers/oprofile
parenta1d23d5c94256ffa0de510a3d59d6eff551d97ae (diff)
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powerpc/powernv: Remove OPAL v1 takeover
In commit 27f4488872d9 "Add OPAL takeover from PowerVM" we added support for "takeover" on OPAL v1 machines. This was a mode of operation where we would boot under pHyp, and query for the presence of OPAL. If detected we would then do a special sequence to take over the machine, and the kernel would end up running in hypervisor mode. OPAL v1 was never a supported product, and was never shipped outside IBM. As far as we know no one is still using it. Newer versions of OPAL do not use the takeover mechanism. Although the query for OPAL should be harmless on machines with newer OPAL, we have seen a machine where it causes a crash in Open Firmware. The code in early_init_devtree() to copy boot_command_line into cmd_line was added in commit 817c21ad9a1f "Get kernel command line accross OPAL takeover", and AFAIK is only used by takeover, so should also be removed. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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