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From 115b09a63d1e5eb07d8c12a6c5369c1577b41f42 Mon Sep 17 00:00:00 2001
From: Steve Shenton <sgsit@libreboot.org>
Date: Fri, 7 Aug 2015 08:22:27 +0100
Subject: [PATCH 6/9] northbridge/gm45/raminit.c: enable GS45 high-performance
mode
The datasheets for GS45 describe a high- and low-performance mode
for different CPUs. Coreboot currently disables GS45 altogether,
but forcing coreboot to treat high-performance GS45 as GM45 makes
the X200S and X200 Tablet boot if it has the right CPU type.
Hardcode-enable GS45 high-performance mode in coreboot, passing it
off as GM45. This is known to work with all CPUs except the SU
(low performance) models.
The low-performance models are unsupported anyway, requiring
extensive work on the raminit. For now, this patch increases
compatibility to a whole new chipset (GS45), depending on the CPU.
Change-Id: I2719385e93c37d254ce38e0f5f486262160234e1
Signed-off-by: Steve Shenton <sgsit@libreboot.org>
Signed-off-by: Leah Rowe <info@minifree.org>
---
src/northbridge/intel/gm45/raminit.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/src/northbridge/intel/gm45/raminit.c b/src/northbridge/intel/gm45/raminit.c
index 9c4fecd..1614b7c 100644
--- a/src/northbridge/intel/gm45/raminit.c
+++ b/src/northbridge/intel/gm45/raminit.c
@@ -108,8 +108,7 @@ void get_gmch_info(sysinfo_t *sysinfo)
printk(BIOS_SPEW, "GMCH: GS40\n");
break;
case GMCH_GS45:
- printk(BIOS_SPEW, "GMCH: GS45, using low power mode by default\n");
- sysinfo->gs45_low_power_mode = 1;
+ printk(BIOS_SPEW, "GMCH: GS45, using high performance mode by default\n");
break;
case GMCH_PM45:
printk(BIOS_SPEW, "GMCH: PM45\n");
@@ -1692,7 +1691,7 @@ void raminit(sysinfo_t *const sysinfo, const int s3resume)
{
const dimminfo_t *const dimms = sysinfo->dimms;
const timings_t *const timings = &sysinfo->selected_timings;
- const int sff = sysinfo->gfx_type == GMCH_GS45;
+ const int sff = (sysinfo->gfx_type == GMCH_GS45) && (sysinfo->gs45_low_power_mode == 1);
int ch;
u8 reg8;
--
1.9.1
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