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To: Warner Losh <imp@bsdimp.com>
Subject: Re: Raspberry PI 
In-reply-to: Your message of "Tue, 30 Oct 2012 22:23:51 MDT."
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Comments: In-reply-to Warner Losh <imp@bsdimp.com>
 message dated "Tue, 30 Oct 2012 22:23:51 -0600."
Date: Tue, 30 Oct 2012 22:07:09 -0700
From: Bakul Shah <bakul@bitblocks.com>
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Cc: Kang Yin Su <cantona@cantona.net>,
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On Tue, 30 Oct 2012 22:23:51 MDT Warner Losh <imp@bsdimp.com>  wrote:
> 
> On Oct 30, 2012, at 9:40 PM, Oleksandr Tymoshenko wrote:
> >> 3. Ethernet mac address random change every time boot-up? It may due to
> >> uboot or firmware issue - apologize if it's OT.
> > It's FreeBSD problem that requires somewhat wider solution then hacking one
>  network driver.
> 
> Why aren't we just getting the MAC address from the FDT?  Isn't that how Linux
> passes it in?

You can directly get it, along with physical display properties,
serial number, board rev, ramsize etc., via the mailbox interface.

See
https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface

You will need to implement something like

    /*
     * make a property request with given tab.
     * buf has any request data on call and any response data on return.
     * reqlen == request length, resplen == response length
     */
    int bcm_mbox_req(int tag, void* buf, int reqlen, int resplen);

and use it as

    enum {
	...
	Tag_getmac       = 0x00010003,
	Tag_getdisp      = 0x00048003,
	...
    };

    uint8_t macaddr[6];
    struct { uint32_t width, height; } rect; 
    bcm_mbox_req(Tag_getmac, macaddr, 0, sizeof macaddr);
    bcm_mbox_req(Tag_getdisp, &rect, 0, sizeof rect);