diff --git a/sys/dev/acpi/sdhc_acpi.c b/sys/dev/acpi/sdhc_acpi.c
index bb58a497b724..db206f7eccb6 100644
--- a/sys/dev/acpi/sdhc_acpi.c
+++ b/sys/dev/acpi/sdhc_acpi.c
@@ -111,6 +111,13 @@ static const struct sdhc_acpi_slot {
 						  SDHC_FLAG_NO_PWR0 |
 						  SDHC_FLAG_SINGLE_POWER_WRITE },
 
+	/* Broadcom BRCM5D12 (eMMC/SD on Raspberry Pi 5) */
+	{ .hid = "BRCM5D12", .uid = "0", .type = SLOT_TYPE_SD,
+					 .flags = SDHC_FLAG_NO_PWR0 },
+	{ .hid = "BRCM5D12", .uid = "1", .type = SLOT_TYPE_EMMC,
+					 .flags = SDHC_FLAG_NO_PWR0 },
+	{ .hid = "BRCM5D12",		 .type = SLOT_TYPE_EMMC },
+
 	/* Generic IDs last */
 	{ .hid = "PNP0D40",		 .type = SLOT_TYPE_SD },
 	{ .hid = "PNP0FFF",  .uid = "3", .type = SLOT_TYPE_SD },
@@ -133,6 +140,7 @@ sdhc_acpi_find_slot(ACPI_DEVICE_INFO *ad)
 		slot = &sdhc_acpi_slot_map[i];
 		const char * const slot_id[] = { slot->hid, NULL };
 		if (acpi_match_hid(ad, slot_id)) {
+printf("%s: hid >%s< uid >%s< flags %x\n", __func__, slot->hid, slot->uid, slot->flags);
 			if (slot->uid == NULL ||
 			    ((ad->Valid & ACPI_VALID_UID) != 0 &&
 			     uid != NULL &&
@@ -179,6 +187,20 @@ sdhc_acpi_attach(device_t parent, device_t self, void *opaque)
 	if (slot->type == SLOT_TYPE_EMMC)
 		sc->sc.sc_vendor_hw_reset = sdhc_acpi_intel_emmc_hw_reset;
 
+#if 1
+	/* Workaround: some boards (e.g. BRCM5D12) don't expose 1.8V control
+	 * via ACPI. Disable 1.8V support so the host won't attempt voltage
+	 * switching which causes SDIO CMD5 to time out. */
+	if ((aa->aa_node->ad_devinfo->Valid & ACPI_VALID_HID) &&
+		aa->aa_node->ad_devinfo->HardwareId.String != NULL &&
+		strcmp(aa->aa_node->ad_devinfo->HardwareId.String, "BRCM5D12") == 0) {
+		sc->sc.sc_flags |= SDHC_FLAG_NO_1_8_V;
+		aprint_verbose_dev(self, "sdhc: applying BRCM5D12 quirk, disabling 1.8V\n");
+		sc->sc.sc_flags |= SDHC_FLAG_NO_PWR0;
+		aprint_verbose_dev(self, "sdhc: applying BRCM5D12 quirk, applying NO_PWR0\n");
+	}
+#endif
+
 	rv = acpi_dsm_query(sc->sc_handle, sdhc_acpi_rockchip_dsm_uuid,
 	    ROCKCHIP_DSM_REV, &funcs);
 	if (ACPI_SUCCESS(rv) &&
diff --git a/sys/dev/sdmmc/if_bwfm_sdio.c b/sys/dev/sdmmc/if_bwfm_sdio.c
index a9326fde603b..449692b5f7dd 100644
--- a/sys/dev/sdmmc/if_bwfm_sdio.c
+++ b/sys/dev/sdmmc/if_bwfm_sdio.c
@@ -297,6 +297,11 @@ static const struct bwfm_sdio_product {
 		SDMMC_PRODUCT_BROADCOM_BCM4334,
 		SDMMC_CIS_BROADCOM_BCM4334
 	},
+	{
+		SDMMC_VENDOR_BROADCOM,
+		SDMMC_PRODUCT_BROADCOM_BCM4345,
+		SDMMC_CIS_BROADCOM_BCM4345
+	},
 	{
 		SDMMC_VENDOR_BROADCOM,
 		SDMMC_PRODUCT_BROADCOM_BCM43143,