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lbmk/config/coreboot/default/patches/0016-nb-intel-gm45-Make-DDR2-raminit-work.patch
T
Leah Rowe 2edd583aee Add ThinkPad X270 coreboot port from Kat Inskip 
Courtesy of Kat Inskip who ported this board.

Headphone output doesn't work at the moment, due to incorrect verb.
Intel VBT is also wrong. Both are taken from another board.

This will be amended later with the correct verb and VBT.

Signed-off-by: Leah Rowe <leah@libreboot.org>
2026-02-21 08:26:44 +00:00

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From d797b9d19c6bc3224897000756caef29e98dd266 Mon Sep 17 00:00:00 2001
From: Angel Pons <th3fanbus@gmail.com>
Date: Mon, 10 May 2021 22:40:59 +0200
Subject: [PATCH 16/48] nb/intel/gm45: Make DDR2 raminit work
List of changes:
- Update some timing and ODT values
- Patch RCOMP calibration to better match what MRC binaries do
- Replay a hardcoded list of RCOMP codes after RcvEn
This makes raminit work at DDR2-800 speeds and fixes S3 resume as well.
Tested on Toshiba Satellite A300-1ME with two 2 GiB DDR2-800 SO-DIMMs.
Change-Id: Ibaee524b8ff652ddadd66cb0eb680401b988ff7c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
---
src/northbridge/intel/gm45/gm45.h | 2 +-
src/northbridge/intel/gm45/raminit.c | 90 +++++++++++++++++--
.../intel/gm45/raminit_rcomp_calibration.c | 27 ++++--
3 files changed, 106 insertions(+), 13 deletions(-)
diff --git a/src/northbridge/intel/gm45/gm45.h b/src/northbridge/intel/gm45/gm45.h
index f68bfdee7a..b76117bc3a 100644
--- a/src/northbridge/intel/gm45/gm45.h
+++ b/src/northbridge/intel/gm45/gm45.h
@@ -420,7 +420,7 @@ void igd_compute_ggc(sysinfo_t *const sysinfo);
int raminit_read_vco_index(void);
u32 raminit_get_rank_addr(unsigned int channel, unsigned int rank);
-void raminit_rcomp_calibration(stepping_t stepping);
+void raminit_rcomp_calibration(int ddr_type, stepping_t stepping);
void raminit_reset_readwrite_pointers(void);
void raminit_receive_enable_calibration(int ddr_type, const timings_t *, const dimminfo_t *);
void raminit_write_training(const mem_clock_t, const dimminfo_t *, bool s3resume);
diff --git a/src/northbridge/intel/gm45/raminit.c b/src/northbridge/intel/gm45/raminit.c
index def9e1e331..7b091cc567 100644
--- a/src/northbridge/intel/gm45/raminit.c
+++ b/src/northbridge/intel/gm45/raminit.c
@@ -1047,7 +1047,7 @@ static void rcomp_initialization(const int spd_type, const stepping_t stepping,
}
/* Perform RCOMP calibration for DDR3. */
- raminit_rcomp_calibration(stepping);
+ raminit_rcomp_calibration(spd_type, stepping);
/* Run initial RCOMP. */
mchbar_setbits32(0x418, 1 << 17);
@@ -1117,7 +1117,7 @@ static void dram_program_timings(const int spd_type, const timings_t *const timi
reg = (reg & ~(0xf << 10)) | (2 << 10);
else
reg = (reg & ~(0xf << 10)) | (3 << 10);
- reg = (reg & ~(0x7 << 5)) | (3 << 5);
+ reg = (reg & ~(0x7 << 5)) | (2 << 5);
} else if (timings->mem_clock != MEM_CLOCK_1067MT) {
reg = (reg & ~(0x7 << 15)) | ((9 - timings->CAS) << 15);
reg = (reg & ~(0xf << 10)) | ((timings->CAS - 3) << 10);
@@ -1286,11 +1286,11 @@ static void ddr2_odt_setup(const timings_t *const timings, const int sff)
reg = (reg & ~(0xf << (44 - 32))) | (8 << (44 - 32));
reg = (reg & ~(0xf << (40 - 32))) | (7 << (40 - 32));
if (timings->mem_clock == MEM_CLOCK_667MT) {
- reg = (reg & ~(0xf << (36 - 32))) | (4 << (36 - 32));
- reg = (reg & ~(0xf << (32 - 32))) | (4 << (32 - 32));
+ reg = (reg & ~(0xf << (36 - 32))) | (8 << (36 - 32));
+ reg = (reg & ~(0xf << (32 - 32))) | (8 << (32 - 32));
} else {
- reg = (reg & ~(0xf << (36 - 32))) | (5 << (36 - 32));
- reg = (reg & ~(0xf << (32 - 32))) | (5 << (32 - 32));
+ reg = (reg & ~(0xf << (36 - 32))) | (9 << (36 - 32));
+ reg = (reg & ~(0xf << (32 - 32))) | (9 << (32 - 32));
}
mchbar_write32(CxODT_HIGH(ch), reg);
@@ -2209,6 +2209,84 @@ void raminit(sysinfo_t *const sysinfo, const bool s3resume)
raminit_write_training(timings->mem_clock, dimms, s3resume);
}
+ /*
+ * Program hardcoded DDR2-800 RCOMP SRAM codes. This must be done
+ * after receiver enable calibration, otherwise raminit sometimes
+ * completes with non-working memory.
+ */
+ mchbar_write32(0x0530, 0x06060005);
+ mchbar_write32(0x0680, 0x06060606);
+ mchbar_write32(0x0684, 0x08070606);
+ mchbar_write32(0x0688, 0x0e0e0c0a);
+ mchbar_write32(0x068c, 0x0e0e0e0e);
+ mchbar_write32(0x0698, 0x06060606);
+ mchbar_write32(0x069c, 0x08070606);
+ mchbar_write32(0x06a0, 0x0c0c0b0a);
+ mchbar_write32(0x06a4, 0x0c0c0c0c);
+
+ mchbar_write32(0x06c0, 0x02020202);
+ mchbar_write32(0x06c4, 0x03020202);
+ mchbar_write32(0x06c8, 0x04040403);
+ mchbar_write32(0x06cc, 0x04040404);
+ mchbar_write32(0x06d8, 0x02020202);
+ mchbar_write32(0x06dc, 0x03020202);
+ mchbar_write32(0x06e0, 0x04040403);
+ mchbar_write32(0x06e4, 0x04040404);
+
+ mchbar_write32(0x0700, 0x02020202);
+ mchbar_write32(0x0704, 0x03020202);
+ mchbar_write32(0x0708, 0x04040403);
+ mchbar_write32(0x070c, 0x04040404);
+ mchbar_write32(0x0718, 0x02020202);
+ mchbar_write32(0x071c, 0x03020202);
+ mchbar_write32(0x0720, 0x04040403);
+ mchbar_write32(0x0724, 0x04040404);
+
+ mchbar_write32(0x0740, 0x02020202);
+ mchbar_write32(0x0744, 0x03020202);
+ mchbar_write32(0x0748, 0x04040403);
+ mchbar_write32(0x074c, 0x04040404);
+ mchbar_write32(0x0758, 0x02020202);
+ mchbar_write32(0x075c, 0x03020202);
+ mchbar_write32(0x0760, 0x04040403);
+ mchbar_write32(0x0764, 0x04040404);
+
+ mchbar_write32(0x0780, 0x06060606);
+ mchbar_write32(0x0784, 0x09070606);
+ mchbar_write32(0x0788, 0x0e0e0c0b);
+ mchbar_write32(0x078c, 0x0e0e0e0e);
+ mchbar_write32(0x0798, 0x06060606);
+ mchbar_write32(0x079c, 0x09070606);
+ mchbar_write32(0x07a0, 0x0d0d0c0b);
+ mchbar_write32(0x07a4, 0x0d0d0d0d);
+
+ mchbar_write32(0x07c0, 0x06060606);
+ mchbar_write32(0x07c4, 0x09070606);
+ mchbar_write32(0x07c8, 0x0e0e0c0b);
+ mchbar_write32(0x07cc, 0x0e0e0e0e);
+ mchbar_write32(0x07d8, 0x06060606);
+ mchbar_write32(0x07dc, 0x09070606);
+ mchbar_write32(0x07e0, 0x0d0d0c0b);
+ mchbar_write32(0x07e4, 0x0d0d0d0d);
+
+ mchbar_write32(0x0840, 0x06060606);
+ mchbar_write32(0x0844, 0x08070606);
+ mchbar_write32(0x0848, 0x0e0e0c0a);
+ mchbar_write32(0x084c, 0x0e0e0e0e);
+ mchbar_write32(0x0858, 0x06060606);
+ mchbar_write32(0x085c, 0x08070606);
+ mchbar_write32(0x0860, 0x0c0c0b0a);
+ mchbar_write32(0x0864, 0x0c0c0c0c);
+
+ mchbar_write32(0x0880, 0x02020202);
+ mchbar_write32(0x0884, 0x03020202);
+ mchbar_write32(0x0888, 0x04040403);
+ mchbar_write32(0x088c, 0x04040404);
+ mchbar_write32(0x0898, 0x02020202);
+ mchbar_write32(0x089c, 0x03020202);
+ mchbar_write32(0x08a0, 0x04040403);
+ mchbar_write32(0x08a4, 0x04040404);
+
igd_compute_ggc(sysinfo);
/* Program final memory map (with real values). */
diff --git a/src/northbridge/intel/gm45/raminit_rcomp_calibration.c b/src/northbridge/intel/gm45/raminit_rcomp_calibration.c
index aef863f05a..b74765fd9c 100644
--- a/src/northbridge/intel/gm45/raminit_rcomp_calibration.c
+++ b/src/northbridge/intel/gm45/raminit_rcomp_calibration.c
@@ -161,11 +161,13 @@ static void lookup_and_write(const int a1step,
mchbar += 4;
}
}
-void raminit_rcomp_calibration(const stepping_t stepping) {
+void raminit_rcomp_calibration(int ddr_type, const stepping_t stepping) {
const int a1step = stepping >= STEPPING_CONVERSION_A1;
int i;
+ char magic_comp[2] = {0};
+
enum {
PULL_UP = 0,
PULL_DOWN = 1,
@@ -196,6 +198,10 @@ void raminit_rcomp_calibration(const stepping_t stepping) {
reg = mchbar_read32(0x518);
lut_idx[channel][group][PULL_UP] = (reg >> 24) & 0x7f;
lut_idx[channel][group][PULL_DOWN] = (reg >> 16) & 0x7f;
+ if (i == 1) {
+ magic_comp[0] = (reg >> 8) & 0x3f;
+ magic_comp[1] = (reg >> 0) & 0x3f;
+ }
}
/* Cleanup? */
mchbar_setbits32(0x400, 1 << 3);
@@ -216,13 +222,19 @@ void raminit_rcomp_calibration(const stepping_t stepping) {
for (channel = 0; channel < 2; ++channel) {
for (group = 0; group < 6; ++group) {
for (pu_pd = PULL_DOWN; pu_pd >= PULL_UP; --pu_pd) {
- lookup_and_write(
- a1step,
- lut_idx[channel][group][pu_pd] - 7,
- ddr3_lookup_schedule[group][pu_pd],
- mchbar);
+ if (ddr_type == DDR3) {
+ lookup_and_write(
+ a1step,
+ lut_idx[channel][group][pu_pd] - 7,
+ ddr3_lookup_schedule[group][pu_pd],
+ mchbar);
+ }
mchbar += 0x0018;
}
+ if (ddr_type == DDR2) {
+ mchbar_clrsetbits32(mchbar + 0, 0x7f << 24, lut_idx[channel][group][PULL_DOWN] << 24);
+ mchbar_clrsetbits32(mchbar + 4, 0x7f << 0, lut_idx[channel][group][PULL_UP] << 0);
+ }
mchbar += 0x0010;
/* Channel B knows only the first two groups. */
if ((1 == channel) && (1 == group))
@@ -230,4 +242,7 @@ void raminit_rcomp_calibration(const stepping_t stepping) {
}
mchbar += 0x0040;
}
+
+ mchbar_clrsetbits32(0x4d0, 0x3f << 26, magic_comp[0] << 26);
+ mchbar_clrsetbits32(0x4d0, 0x3f << 20, magic_comp[1] << 20);
}
--
2.47.3
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