firmware: reset ethphy before initializing smoltcp (fixes #884).

artiq/firmware/bootloader/main.rs

@@ -158,10 +158,12 @@ fn network_boot() {
 
     println!("Using MAC address {} and IP address {}", eth_addr, ip_addr);
 
-    let net_device = unsafe { ethmac::EthernetDevice::new() };
-    let mut neighbor_cache_storage = [None; 2];
+    let mut net_device = unsafe { ethmac::EthernetDevice::new() };
+    net_device.reset();
+
+    let mut neighbor_map = [None; 2];
     let neighbor_cache =
-        smoltcp::iface::NeighborCache::new(&mut neighbor_cache_storage[..]);
+        smoltcp::iface::NeighborCache::new(&mut neighbor_map[..]);
     let mut ip_addrs = [IpCidr::new(ip_addr, 0)];
     let mut interface  =
         smoltcp::iface::EthernetInterfaceBuilder::new(net_device)

artiq/firmware/libboard/ethmac.rs

@@ -4,6 +4,7 @@ use smoltcp::phy::{self, DeviceCapabilities, Device};
 
 use csr;
 use mem::ETHMAC_BASE;
+use clock;
 
 const RX_SLOTS: usize = csr::ETHMAC_RX_SLOTS as usize;
 const TX_SLOTS: usize = csr::ETHMAC_TX_SLOTS as usize;
@@ -45,6 +46,15 @@ impl EthernetDevice {
     pub unsafe fn new() -> EthernetDevice {
         EthernetDevice(())
     }
+
+    pub fn reset(&mut self) {
+        unsafe {
+            csr::ethphy::crg_reset_write(1);
+            clock::spin_us(2_000);
+            csr::ethphy::crg_reset_write(0);
+            clock::spin_us(2_000);
+        }
+    }
 }
 
 impl<'a> Device<'a> for EthernetDevice {

artiq/firmware/runtime/main.rs

@@ -130,18 +130,20 @@ fn startup_ethernet() {
         }
     }
 
+    let mut net_device = unsafe { ethmac::EthernetDevice::new() };
+    net_device.reset();
+
     // fn _net_trace_writer<U>(timestamp: u64, printer: smoltcp::wire::PrettyPrinter<U>)
     //         where U: smoltcp::wire::pretty_print::PrettyPrint {
     //     let seconds = timestamp / 1000;
     //     let micros  = timestamp % 1000 * 1000;
     //     print!("\x1b[37m[{:6}.{:06}s]\n{}\x1b[0m\n", seconds, micros, printer)
     // }
-
-    let net_device = unsafe { ethmac::EthernetDevice::new() };
     // let net_device = smoltcp::phy::EthernetTracer::new(net_device, _net_trace_writer);
-    let mut neighbor_cache_storage = [None; 8];
+
+    let mut neighbor_map = [None; 8];
     let neighbor_cache =
-        smoltcp::iface::NeighborCache::new(&mut neighbor_cache_storage[..]);
+        smoltcp::iface::NeighborCache::new(&mut neighbor_map[..]);
     let mut interface  =
         smoltcp::iface::EthernetInterfaceBuilder::new(net_device)
                        .neighbor_cache(neighbor_cache)