codebje opened a new pull request #2923:
URL: https://github.com/apache/incubator-nuttx/pull/2923
## Summary
IRQs cannot be individually disabled on the eZ80, so using
`up_disable_irq()` had no effect. This left the IRQ handler being
constantly triggered without the lower half handler running.
The macro for EMAC stats was incompatible with Clang. The simplified
form gives identical results under ZDS-II.
The MII clock speed must be set before trying to read MII registers.
It's now done before resetting the PHY using the Mode Control Register.
A few typos, unused variables, and other miscellaneous issues were also
fixed.
## Impact
These changes permit building the eZ80 EMAC driver and enable basic Ethernet
functionality.
## Testing
Successful ICMP echo receive and response:
```
ez80emac_receive: rxnext=0xffdd00 {ffdd80, 102, 8020} rrp=0xffdd00
rwp=0xffdd80 blkslft=003e
ez80emac_receive: rxnext=0xffdd80 {653734, 14128, 3166} rrp=0xffdd80
rwp=0xffdd80 blkslft=0040
ez80emac_receive: IPv4 frame
icmp_input: Outgoing ICMP packet length: 84 (84)
ez80emac_transmit: txnext=0xffc6c0 {000000, 0, 0000} trp=06c0
ez80emac_transmit: txdesc=0xffc6c0 {ffc740, 98, 8000}
ez80emac_transmit: txnext=0xffc740 {000000, 0, 0000} trp=0740
ez80emac_txinterrupt_work: txhead=0xffc6c0 {ffc740, 98, 0000} trp=0740
istat=01
ez80emac_txinterrupt_work: txhead=0xffc740 {000000, 0, 0000} trp=0740
ez80emac_txinterrupt_work: No pending Tx.. Stopping XMIT function.
```
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