From 4337020b950454815204eed4e43a894be0b125ca Mon Sep 17 00:00:00 2001 From: Vladimir Serbinenko Date: Wed, 5 Feb 2014 19:46:45 +0100 Subject: Remove CACHE_ROM. With the recent improvement 3d6ffe76f8a505c2dff5d5c6146da3d63dad6e82, speedup by CACHE_ROM is reduced a lot. On the other hand this makes coreboot run out of MTRRs depending on system configuration, hence screwing up I/O access and cache coherency in worst cases. CACHE_ROM requires the user to sanity check their boot output because the feature is brittle. The working configuration is dependent on I/O hole size, ram size, and chipset. Because of this the current implementation can leave a system configured in an inconsistent state leading to unexpected results such as poor performance and/or inconsistent cache-coherency Remove this as a buggy feature until we figure out how to do it properly if necessary. Change-Id: I858d78a907bf042fcc21fdf7a2bf899e9f6b591d Signed-off-by: Vladimir Serbinenko Reviewed-on: http://review.coreboot.org/5146 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/northbridge/intel/sandybridge/northbridge.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'src/northbridge/intel/sandybridge/northbridge.c') diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c index 7db9301c30..5440140089 100644 --- a/src/northbridge/intel/sandybridge/northbridge.c +++ b/src/northbridge/intel/sandybridge/northbridge.c @@ -476,8 +476,6 @@ static const struct pci_driver mc_driver_1 __pci_driver = { static void cpu_bus_init(device_t dev) { initialize_cpus(dev->link_list); - /* Enable ROM caching if option was selected. */ - x86_mtrr_enable_rom_caching(); } static void cpu_bus_noop(device_t dev) -- cgit v1.2.3