diff options
| author | Patrick Rudolph <siro@das-labor.org> | 2015-10-21 18:05:01 +0200 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2015-11-18 15:09:56 +0100 |
| commit | aad34cda4bc9c14ed10b00fe5da3f32233257913 (patch) | |
| tree | ee025607dd68e1bec7fdbd81f762c5390802f08d /src/northbridge/intel/sandybridge | |
| parent | 240766af027a6f1f7c854eeea799965e30686ce7 (diff) | |
nb/intel/sandybridge: Fix PEG disablement
Fix regression introduced by:
3660c0fc658e4e20ef079f762dfc7ad05c83544c
"northbridge/intel/sandybridge: Enable PEG clock-gating on demand"
Issue observed:
GNU/Linux kernel crashes in earlyinit on systems without PEG devices.
The crash occurs on every boot in different functions.
There's no problem on systems with PEG enabled.
Test system:
* Lenovo T530
* Intel Core i5-3320M CPU
* Fedora GNU/Linux 4.1
* PEG disabled in devicetree
Problem description:
Tests shows that modifing PEG chicken bit or device enable bits
after setting BIOS_RESET_CPL causes random crashes in GNU/Linux.
Problem solution:
Disable PEG devices before setting BIOS_RESET_CPL.
Final testing results:
No more random kernel crashes.
Change-Id: I4a967c2d00d7d1e4426cf5abdd5f616c21557da7
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: http://review.coreboot.org/12112
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/northbridge/intel/sandybridge')
| -rw-r--r-- | src/northbridge/intel/sandybridge/northbridge.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/src/northbridge/intel/sandybridge/northbridge.c b/src/northbridge/intel/sandybridge/northbridge.c index 1ebb81ec91..53d93a2501 100644 --- a/src/northbridge/intel/sandybridge/northbridge.c +++ b/src/northbridge/intel/sandybridge/northbridge.c @@ -438,6 +438,11 @@ static void northbridge_init(struct device *dev) } MCHBAR32(0x5f10) = bridge_type; + /* Turn off unused devices. Has to be done before + * setting BIOS_RESET_CPL. + */ + disable_peg(); + /* * Set bit 0 of BIOS_RESET_CPL to indicate to the CPU * that BIOS has initialized memory and power management @@ -463,9 +468,6 @@ static void northbridge_init(struct device *dev) /* Set here before graphics PM init */ MCHBAR32(0x5500) = 0x00100001; - - /* Turn off unused devices */ - disable_peg(); } static void northbridge_enable(device_t dev) |