Move ethernet DMA reset slightly earlier to eliminate freeze on h723

Author: jlogan03

src/ethernet/eth.rs

@@ -455,6 +455,12 @@ pub unsafe fn new_unchecked<const TD: usize, const RD: usize>(
         // Ensure syscfg is enabled (for PMCR)
         rcc.apb4enr.modify(|_, w| w.syscfgen().set_bit());
 
+        // Reset ETH_DMA - write 1 and wait for 0.
+        // On the H723, we have to do this before prec.enable()
+        // or the DMA will never come out of reset
+        eth_dma.dmamr.modify(|_, w| w.swr().set_bit());
+        while eth_dma.dmamr.read().swr().bit_is_set() {}
+
         // AHB1 ETH1MACEN
         prec.enable();
 
@@ -465,16 +471,14 @@ pub unsafe fn new_unchecked<const TD: usize, const RD: usize>(
             .modify(|_, w| w.eth1txen().set_bit().eth1rxen().set_bit());
 
         syscfg.pmcr.modify(|_, w| w.epis().bits(0b100)); // RMII
+
     }
 
     // reset ETH_MAC - write 1 then 0
     //rcc.ahb1rstr.modify(|_, w| w.eth1macrst().set_bit());
     //rcc.ahb1rstr.modify(|_, w| w.eth1macrst().clear_bit());
 
     cortex_m::interrupt::free(|_cs| {
-        // reset ETH_DMA - write 1 and wait for 0
-        eth_dma.dmamr.modify(|_, w| w.swr().set_bit());
-        while eth_dma.dmamr.read().swr().bit_is_set() {}
 
         // 200 MHz
         eth_mac