diff --git a/zynq/examples/zedboard/src/bin/sdio.rs b/zynq/examples/zedboard/src/bin/sdio.rs
index a8d2b69..99b17e3 100644
--- a/zynq/examples/zedboard/src/bin/sdio.rs
+++ b/zynq/examples/zedboard/src/bin/sdio.rs
@@ -13,13 +13,13 @@ use zynq7000_hal::gpio::Input;
 use zynq7000_hal::prelude::*;
 use zynq7000_hal::{
     BootMode, clocks, gic, gpio, gtc,
-    sdio::{Sdio, SdioClockConfig, SdioLowLevel},
+    sdio::{Sdio, SdioClockConfig},
     uart,
 };
 
 use zynq7000_rt as _;
 
-const INIT_STRING: &str = "-- Zynq 7000 Zedboard GPIO blinky example --\n\r";
+const INIT_STRING: &str = "-- Zynq 7000 Zedboard SDIO example --\n\r";
 
 /// Entry point (not called like a normal main function)
 #[unsafe(no_mangle)]
@@ -42,7 +42,7 @@ async fn main(_spawner: Spawner) -> ! {
     // Clock was already initialized by PS7 Init TCL script or FSBL, we just read it.
     let clocks = clocks::Clocks::new_from_regs(PS_CLOCK_FREQUENCY).unwrap();
 
-    let mut gpio_pins = gpio::GpioPins::new(periphs.gpio);
+    let gpio_pins = gpio::GpioPins::new(periphs.gpio);
 
     // Set up global timer counter and embassy time driver.
     let gtc = gtc::GlobalTimerCounter::new(periphs.gtc, clocks.arm_clocks());
@@ -69,7 +69,7 @@ async fn main(_spawner: Spawner) -> ! {
     };
 
     let sdio_clock_config =
-        SdioClockConfig::calculate_for_io_clock(clocks.io_clocks(), 100.MHz(), 10.MHz());
+        SdioClockConfig::calculate_for_io_clock(clocks.io_clocks(), 100.MHz(), 10.MHz()).unwrap();
     let sdio = Sdio::new_for_sdio_0(
         periphs.sdio_0,
         sdio_clock_config,
@@ -85,7 +85,10 @@ async fn main(_spawner: Spawner) -> ! {
     .unwrap();
     let card_detect = Input::new_for_mio(gpio_pins.mio.mio47).unwrap();
     let write_protect = Input::new_for_mio(gpio_pins.mio.mio46).unwrap();
-    info!("Card detect state: {:?}", card_detect.is_high());
+    // The card detect being active low makes sense according to the Zedboard docs. Not sure
+    // about write-protect though.. It seems that write protect on means that the
+    // the pin is pulled high.
+    info!("Card detect state: {:?}", card_detect.is_low());
     info!("Write protect state: {:?}", write_protect.is_high());
 
     let capabilities = sdio.ll().capabilities();
diff --git a/zynq/zynq7000-hal/src/eth/mod.rs b/zynq/zynq7000-hal/src/eth/mod.rs
index f4abc64..2197144 100644
--- a/zynq/zynq7000-hal/src/eth/mod.rs
+++ b/zynq/zynq7000-hal/src/eth/mod.rs
@@ -470,7 +470,7 @@ impl Ethernet {
                 });
             });
         }
-        ll.configure_peripheral_clock(config.clk_config_1000_mbps, true);
+        ll.configure_clock(config.clk_config_1000_mbps, true);
         let mut mdio = mdio::Mdio::new(&ll, true);
         mdio.configure_clock_div(config.mdc_clk_div);
         ll.regs.modify_net_ctrl(|mut val| {
@@ -491,7 +491,7 @@ impl Ethernet {
 
     pub fn new(mut ll: EthernetLowLevel, config: EthernetConfig) -> Self {
         Self::common_init(&mut ll, config.mac_address);
-        ll.configure_peripheral_clock(config.clk_config_1000_mbps, true);
+        ll.configure_clock(config.clk_config_1000_mbps, true);
         let mut mdio = mdio::Mdio::new(&ll, true);
         mdio.configure_clock_div(config.mdc_clk_div);
         Ethernet {
diff --git a/zynq/zynq7000-hal/src/sdio.rs b/zynq/zynq7000-hal/src/sdio.rs
index a7643b5..de367a5 100644
--- a/zynq/zynq7000-hal/src/sdio.rs
+++ b/zynq/zynq7000-hal/src/sdio.rs
@@ -10,7 +10,7 @@ use crate::gpio::mio::{
     Mio41, Mio42, Mio43, Mio44, Mio45, Mio46, Mio47, Mio50, Mio51,
 };
 use crate::{
-    clocks::{Clocks, IoClocks},
+    clocks::IoClocks,
     gpio::{
         IoPeriphPin,
         mio::{
@@ -22,6 +22,10 @@ use crate::{
     time::Hertz,
 };
 
+#[derive(Debug, thiserror::Error)]
+#[error("invalid peripheral instance")]
+pub struct InvalidPeripheralError;
+
 pub const MUX_CONF: MuxConfig = MuxConfig::new_with_l3(u3::new(0b100));
 
 pub trait Sdio0ClockPin: MioPin {}
@@ -354,12 +358,12 @@ impl Sdio {
         clock_pin: Sdio0Clock,
         command_pin: Sdio0Command,
         data_pins: (Sdio0Data0, Sdio0Data1, Sdio0Data2, Sdio0Data3),
-    ) -> Option<Self> {
-        let id = regs.id()?;
-        if id != SdioId::Sdio1 {
-            return None;
+    ) -> Result<Self, InvalidPeripheralError> {
+        let id = regs.id().ok_or(InvalidPeripheralError)?;
+        if id != SdioId::Sdio0 {
+            return Err(InvalidPeripheralError);
         }
-        Some(Self::new(
+        Ok(Self::new(
             regs,
             clock_config,
             clock_pin,
@@ -381,12 +385,12 @@ impl Sdio {
         clock_pin: Sdio1Clock,
         command_pin: Sdio1Command,
         data_pins: (Sdio1Data0, Sdio1Data1, Sdio1Data2, Sdio1Data3),
-    ) -> Option<Self> {
-        let id = regs.id()?;
+    ) -> Result<Self, InvalidPeripheralError> {
+        let id = regs.id().ok_or(InvalidPeripheralError)?;
         if id != SdioId::Sdio1 {
-            return None;
+            return Err(InvalidPeripheralError);
         }
-        Some(Self::new(
+        Ok(Self::new(
             regs,
             clock_config,
             clock_pin,