(nuttx) branch master updated: arch/mips/pic32mz: add an option for the Ethernet MAC address.

[michallenc]

This is an automated email from the ASF dual-hosted git repository.

michallenc pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/nuttx.git


The following commit(s) were added to refs/heads/master by this push:
     new ba7f7a56552 arch/mips/pic32mz: add an option for the Ethernet MAC 
address.
ba7f7a56552 is described below

commit ba7f7a56552835bc4388b53d34730b1723d4b839
Author: Daniel P. Carvalho <daniel...@gmail.com>
AuthorDate: Sun Oct 18 15:04:02 2026 -0300

    arch/mips/pic32mz: add an option for the Ethernet MAC address.
    
    The PIC32MZ-W1 has no factory programmed station address, so the
    Ethernet interface came up with 00:00:00:00:00:00 and the address had to
    be assigned from user space (ifconfig eth0 hw ...) before it could carry
    any traffic.
    
    Add PIC32MZ_ETH_MACADDR to give the interface a fixed address at
    registration.  The default of zero keeps the current behavior: the
    address programmed at reset, or one assigned later with SIOCSIFHWADDR.
    
    Assisted-by: Claude Code:claude-sonnet-5-5
    Signed-off-by: Daniel P. Carvalho <daniel...@gmail.com>
---
 arch/mips/src/pic32mz/Kconfig            | 13 +++++++++++++
 arch/mips/src/pic32mz/pic32mz_ethernet.c | 19 +++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/arch/mips/src/pic32mz/Kconfig b/arch/mips/src/pic32mz/Kconfig
index ad359313e73..cc2a5aeaf5c 100644
--- a/arch/mips/src/pic32mz/Kconfig
+++ b/arch/mips/src/pic32mz/Kconfig
@@ -1276,6 +1276,19 @@ config PIC32MZ_ETH_NTXDESC
        ---help---
                Configured number of Tx descriptors. Default: 2
 
+config PIC32MZ_ETH_MACADDR
+       hex "Ethernet MAC address"
+       default 0x000000000000
+       depends on PIC32MZ_ETHERNET
+       ---help---
+               MAC address of the Ethernet interface, for chips without a 
factory
+               programmed station address (the PIC32MZ-W1 has none).  Use a
+               locally administered address (second least significant bit of 
the
+               first octet set), e.g. 0x02e0deadbeef.
+
+               Zero keeps the address programmed at reset, or one assigned 
later
+               with SIOCSIFHWADDR.
+
 config PIC32MZ_ETH_NRXDESC
        int "Number Rx descriptors"
        default 4
diff --git a/arch/mips/src/pic32mz/pic32mz_ethernet.c 
b/arch/mips/src/pic32mz/pic32mz_ethernet.c
index 8f7976e018d..5d4a7162bd0 100644
--- a/arch/mips/src/pic32mz/pic32mz_ethernet.c
+++ b/arch/mips/src/pic32mz/pic32mz_ethernet.c
@@ -3494,6 +3494,25 @@ static inline int pic32mz_ethinitialize(int intf)
       return -EAGAIN;
     }
 
+#if CONFIG_PIC32MZ_ETH_MACADDR != 0
+  /* The chip has no factory station address (PIC32MZ-W1): use the
+   * configured one.
+   */
+
+  priv->pd_dev.netdev.d_mac.ether.ether_addr_octet[0] =
+    (CONFIG_PIC32MZ_ETH_MACADDR >> (8 * 5)) & 0xff;
+  priv->pd_dev.netdev.d_mac.ether.ether_addr_octet[1] =
+    (CONFIG_PIC32MZ_ETH_MACADDR >> (8 * 4)) & 0xff;
+  priv->pd_dev.netdev.d_mac.ether.ether_addr_octet[2] =
+    (CONFIG_PIC32MZ_ETH_MACADDR >> (8 * 3)) & 0xff;
+  priv->pd_dev.netdev.d_mac.ether.ether_addr_octet[3] =
+    (CONFIG_PIC32MZ_ETH_MACADDR >> (8 * 2)) & 0xff;
+  priv->pd_dev.netdev.d_mac.ether.ether_addr_octet[4] =
+    (CONFIG_PIC32MZ_ETH_MACADDR >> (8 * 1)) & 0xff;
+  priv->pd_dev.netdev.d_mac.ether.ether_addr_octet[5] =
+    (CONFIG_PIC32MZ_ETH_MACADDR >> (8 * 0)) & 0xff;
+#endif
+
   /* Register the device with the OS so that socket IOCTLs can be performed */
 
   ret = netdev_lower_register(&priv->pd_dev, NET_LL_ETHERNET);