diff options
| author | Mario Scheithauer <mario.scheithauer@siemens.com> | 2023-07-04 15:41:35 +0200 |
|---|---|---|
| committer | Felix Held <felix-coreboot@felixheld.de> | 2023-07-06 13:55:43 +0000 |
| commit | 0ec7a9f1740003e013c1f26262efef3734aebeb1 (patch) | |
| tree | 1cf1313889494a2cc0367c7ecabe4625343c6aaf /src/mainboard/siemens | |
| parent | 81fb981e8ecec077674b5d3bce823b0efd9459cc (diff) | |
mb/siemens/mc_ehl4: Make DRAM population depending on GPIO GPP_B5
GPIO GPP_B5 is used as input on this mainboard. For a full-populated
DRAM configuration, the input signal is connected to ground and for a
half-populated configuration it is connected to 3.3 V.
BUG=none
TEST=Use different HW configurations and check coreboot log
GPP_B5 = 0:
[DEBUG] 2 DIMMs found
GPP_B5 = 1:
[INFO ] meminit_channels: DRAM half-populated
[DEBUG] 1 DIMMs found
Change-Id: I48b4a3bea7f1ff804b78b7c648a7ea1925627b8a
Signed-off-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76245
Reviewed-by: Jan Samek <jan.samek@siemens.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Diffstat (limited to 'src/mainboard/siemens')
| -rw-r--r-- | src/mainboard/siemens/mc_ehl/variants/mc_ehl4/gpio.c | 1 | ||||
| -rw-r--r-- | src/mainboard/siemens/mc_ehl/variants/mc_ehl4/memory.c | 8 |
2 files changed, 9 insertions, 0 deletions
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/gpio.c b/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/gpio.c index 9f1c77f20a..4919ac7433 100644 --- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/gpio.c +++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/gpio.c @@ -118,6 +118,7 @@ static const struct pad_config gpio_table[] = { /* Early pad configuration in bootblock */ static const struct pad_config early_gpio_table[] = { + PAD_CFG_GPI(GPP_B5, NONE, DEEP), /* DRAM population */ PAD_CFG_NF(GPP_C0, NONE, DEEP, NF1), /* SMB_CLK */ PAD_CFG_NF(GPP_C1, NONE, DEEP, NF1), /* SMB_DATA */ PAD_CFG_NF(GPP_C2, NONE, DEEP, NF2), /* SMB_ALERT_N */ diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/memory.c b/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/memory.c index 7b7dad1129..dc0f073201 100644 --- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/memory.c +++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl4/memory.c @@ -57,3 +57,11 @@ const struct mb_cfg *variant_memcfg_config(void) { return &mc_ehl_lpddr4x_memcfg_cfg; } + +bool half_populated(void) +{ + /* There are two different memory expansion variants of this mainboard. + The GPIO GPP_B5 indicates whether the mainboard is equipped with half- or + full-populated DRAM. */ + return gpio_get(GPP_B5); +} |