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Use ethernet MAC programmed in imxrt OCOTP MAC0/MAC1 (teemsy board has this)

This commit is contained in:
P.Brier 2021-09-29 20:40:15 +02:00 committed by Xiang Xiao
parent dfc08a0b66
commit b9d1fcb232
2 changed files with 34 additions and 0 deletions
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25
arch/arm/src/imxrt/imxrt_enet.c
View File

@ -2560,6 +2560,28 @@ int imxrt_netinitialize(int intf)
priv->dev.d_private = g_enet; /* Used to recover private state from dev */
#ifdef CONFIG_NET_ETHERNET
#ifdef CONFIG_NET_USE_OTP_ETHERNET_MAC
/* Boards like the teensy have a unique (official)
* MAC address stored in OTP.
* TODO: hardcoded mem locations: use proper registers and header file
* offsets: 0x620: MAC0, 0x630: MAC1
*/
uidl = getreg32(IMXRT_OCOTP_BASE + 0x620);
uidml = getreg32(IMXRT_OCOTP_BASE + 0x630);
mac = priv->dev.d_mac.ether.ether_addr_octet;
mac[0] = (uidml & 0x0000ff00) >> 8;
mac[1] = (uidml & 0x000000ff) >> 0;
mac[2] = (uidl & 0xff000000) >> 24;
mac[3] = (uidl & 0x00ff0000) >> 16;
mac[4] = (uidl & 0x0000ff00) >> 8;
mac[5] = (uidl & 0x000000ff) >> 0;
#else
/* Determine a semi-unique MAC address from MCU UID
* We use UID Low and Mid Low registers to get 64 bits, from which we keep
* 48 bits. We then force unicast and locally administered bits
@ -2581,6 +2603,9 @@ int imxrt_netinitialize(int intf)
mac[3] = (uidl & 0x00ff0000) >> 16;
mac[4] = (uidl & 0x0000ff00) >> 8;
mac[5] = (uidl & 0x000000ff);
#endif
#endif
#ifdef CONFIG_IMXRT_ENET_PHYINIT

9
boards/arm/imxrt/teensy-4.x/Kconfig
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@ -30,4 +30,13 @@ config IMXRT_FLEXCAN3_AS_CAN0
This configuration option ensures that if more that one CAN bus is set on
that CAN 3 (with FD capability) will be initialized as can0.
config NET_USE_OTP_ETHERNET_MAC
bool "Use Ethernet MAC address stored in OCOTP_MAC0 and OCOTP_MAC1"
---help---
The teensy 4.1 board has an "offical" unique MAC address stored in OCOTP (One-Time-Programmable) memory.
When enabling this option, it is read and used when the ethernet peripheral is initialized.
If so, the 'ifconfig eth0' HWaddr should start with 04:e9:e5:...
(the vendor ID of 'PJRC.COM, LLC') when this feature is enabled.
It may also be used with other boards that have the OCOTP programmed with a valid MAC.
endif