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author | Arthur Heymans <arthur@aheymans.xyz> | 2018-06-16 20:01:47 +0200 |
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committer | Kyösti Mälkki <kyosti.malkki@gmail.com> | 2018-06-27 11:48:53 +0000 |
commit | 7875dbd9812e2359de2c5aed7754703138878466 (patch) | |
tree | 9b49b722d780bd2707e4764b6a85239e5cd916de /src/drivers/ricoh | |
parent | ce9f422b512c376ba0eeec41db92d9a87155105a (diff) |
cpu/intel/p4-netburst: skip caching rom on model_fxx
An unidentified combination of speculative reads and branch
predictions inside WRPROT-cacheable memory can cause invalidation of
cachelines and loss of stack on models based on NetBurst
microarchitecture.
Therefore disable WRPROT region entirely for all family F models.
As an extreme example, just changing the location of a constant string
passed to printk() has been witnessed to make a the boot fail early on
in romstage.
Change-Id: I1df84ad55e2d8d6d4e8dca10125131b5f525f0d7
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/27133
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Diffstat (limited to 'src/drivers/ricoh')
0 files changed, 0 insertions, 0 deletions