diff options
| -rw-r--r-- | src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c b/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c index 0c2418ad27..f52091bced 100644 --- a/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c +++ b/src/mainboard/siemens/mc_apl1/variants/mc_apl2/mainboard.c @@ -23,6 +23,11 @@ #include <timer.h> #include <timestamp.h> #include <baseboard/variants.h> +#include <soc/pci_devs.h> + +#define SD_CAP_BYP 0x810 +#define SD_CAP_BYP_EN 0x5A +#define SD_CAP_BYP_REG1 0x814 void variant_mainboard_final(void) { @@ -36,6 +41,21 @@ void variant_mainboard_final(void) cmd |= PCI_COMMAND_MASTER; pci_write_config16(dev, PCI_COMMAND, cmd); } + + /* Reduce SD-Card speed to DDR50 because of PCB constraints. */ + dev = pcidev_path_on_root(PCH_DEVFN_SDCARD); + if (dev) { + uint32_t reg; + struct resource *res = find_resource(dev, PCI_BASE_ADDRESS_0); + if (!res) + return; + + write32(res2mmio(res, SD_CAP_BYP, 0), SD_CAP_BYP_EN); + reg = read32(res2mmio(res, SD_CAP_BYP_REG1, 0)); + /* Disable HS400 and SDR104, keep SDR50 and DDR50 modes. */ + reg &= ~0x20005800; + write32(res2mmio(res, SD_CAP_BYP_REG1, 0), reg); + } } static void wait_for_legacy_dev(void *unused) |