Mario Scheithauer has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/85881?usp=email )
Change subject: mb/siemens/mc_ehl2: Limit eMMC speed mode to DDR50 ......................................................................
mb/siemens/mc_ehl2: Limit eMMC speed mode to DDR50
Due to layout restrictions on mc_ehl2, the eMMC interface is limited to operate in DDR50 mode. The alternative modes SDR104 and SDR50 are not supported. Limit the capabilities in the eMMC controller to DDR50 mode only so that the eMMC driver in OS will choose the right mode for operation even if the attached eMMC card supports higher modes.
BUG=none TEST=Boot into Linux and check dmesg output for mmc modes
Change-Id: I668bb5b0b3197497920b36bcf283c25d2a0c00ba Signed-off-by: Mario Scheithauer mario.scheithauer@siemens.com --- M src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c 1 file changed, 9 insertions(+), 0 deletions(-)
git pull ssh://review.coreboot.org:29418/coreboot refs/changes/81/85881/1
diff --git a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c index 76f7593..a59b69c 100644 --- a/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c +++ b/src/mainboard/siemens/mc_ehl/variants/mc_ehl2/mainboard.c @@ -49,6 +49,15 @@ /* Use preset driver strength from preset value registers. */ clrsetbits16(res2mmio(res, HOSTCTRL2, 0), 0, HOSTCTRL2_PRESET); } + + dev = pcidev_path_on_root(PCH_DEVFN_EMMC); + if (dev) { + struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0); + if (!res) + return; + + disable_sdr_modes(res); + } }
static void finalize_boot(void *unused)