Date: Mon, 25 Sep 2023 22:26:12 +0200 From: Ronald Klop <ronald@FreeBSD.org> To: "Patrick M. Hausen" <pmh@hausen.com> Cc: freebsd-arm <freebsd-arm@freebsd.org> Subject: Re: Getting a stable MAC address for a RPI CM3+ with ue0 interface Message-ID: <fec9f18a-8d8e-8909-f026-bd6ac50e77b4@FreeBSD.org> In-Reply-To: <8305B36C-9DFE-4FF1-A836-80F2931A6A46@hausen.com> References: <3C1032FF-B914-4863-8A03-759A8B4BE216@hausen.com> <77E70D30-8E7D-42DC-A041-3A783E1C6908@yahoo.com> <5205C76E-BAB4-4AB7-8A03-1E8A2D4353BB@hausen.com> <B50A4409-84C0-405D-8099-43692243AE52@hausen.com> <84C20AD4-1F37-414E-8808-60A2C9B621D9@karels.net> <4951c134-39be-43de-0aa7-430a136d8b36@FreeBSD.org> <2071C2B6-B61A-40E0-8DA2-1E23D463B2E9@hausen.com> <8305B36C-9DFE-4FF1-A836-80F2931A6A46@hausen.com>
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On 9/25/23 19:10, Patrick M. Hausen wrote: > Hi all > >> Am 24.09.2023 um 23:05 schrieb Patrick M. Hausen <pmh@hausen.com>: >> >> Hi all >> >>> Am 23.09.2023 um 21:28 schrieb Ronald Klop <ronald@FreeBSD.org>: >>> >>> Would this work? >>> >>> diff --git a/sys/dev/usb/net/if_smsc.c b/sys/dev/usb/net/if_smsc.c >>> index 0a0268bfa1a2..4a7983a20717 100644 >>> --- a/sys/dev/usb/net/if_smsc.c >>> +++ b/sys/dev/usb/net/if_smsc.c >>> [...] >> >> After building and installing the kernel with this patch and reboot I >> lost access to the node I used. I will try to set up console access >> somehow ... > > The development board I use for flashing etc. has got a serial port > connector and even a USB to serial converter so you can just plug in > USB to your laptop - I did not get any console output, though. > > https://www.waveshare.com/wiki/Compute_Module_PoE_Board#Serial_port > > I did get console output via HDMI, but my Apple keyboard seems not > to work when plugged in to USB so I could not really examine what > is wrong or boot into kernel.old - only diagonistic I can provide: > > The new kernel prints the "No MAC address found" message, then panics. > > I'm reflashing the module now ... > > From reading your source code, what are you really trying to achieve? > More diagnostic messages are a good thing, but from where are you > trying to read that MAC address? The method ether_gen_addr() generates a MAC address bases on hostuuid and interface name. Maybe not ideal, bu a lot better then a random MAC. sys/net/if_ethersubr.c: /* * Allocate an address from the FreeBSD Foundation OUI. This uses a * cryptographic hash function on the containing jail's name, UUID and the * interface name to attempt to provide a unique but stable address. * Pseudo-interfaces which require a MAC address should use this function to * allocate non-locally-administered addresses. */ void ether_gen_addr(struct ifnet *ifp, struct ether_addr *hwaddr) It would be nice to see more information from the panic. Can you make a picture or movie of the screen while this happens? Or does the system make a kernel crashdump? See "dumpdev" in /etc/defaults/rc.conf. A crashdump is written to the swap partition and on reboot a summary is written in /var/crash from what is in the swap partition. This is all assuming the system has a large enough swap partition. Regards, Ronald. > As far as I understand for the Pi you are supposed to use the RPi > foundation OUI B8:27:EB plus the lower three octets of the Pi's > serial number - regardless of the Ethernet adapter plugged in. > > All Pis running Linux do this. > > Kind regards, > Patrick
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