[U-Boot] ARM: rpi_b: query internal MAC address from firmware

[Jeroen Hofstee <jeroen@myspectrum.nl>]

Hello Stephan,

On 24-09-14 05:45, Stephen Warren wrote:
> The built-in SMSC 95xx chip doesn't know its own MAC address. Instead,
> we must query it from the VC firmware; it's probably encoded in fuses
> on the BCM2835.
>
> Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>
> ---
> This depends on "usb: dwc2: Add driver for Synopsis DWC2 USB IP block
> from Marek Vasut".
>
>   arch/arm/include/asm/arch-bcm2835/mbox.h | 14 ++++++++++++++
>   board/raspberrypi/rpi_b/rpi_b.c          | 26 ++++++++++++++++++++++++++
>   include/configs/rpi_b.h                  |  1 +
>   3 files changed, 41 insertions(+)
>
[snip]
>   
> +int misc_init_r(void)
> +{
> +	ALLOC_ALIGN_BUFFER(struct msg_get_mac_address, msg, 1, 16);
> +	int ret;
> +
> +	BCM2835_MBOX_INIT_HDR(msg);
> +	BCM2835_MBOX_INIT_TAG(&msg->get_mac_address, GET_MAC_ADDRESS);
> +
> +	ret = bcm2835_mbox_call_prop(BCM2835_MBOX_PROP_CHAN, &msg->hdr);
> +	if (ret) {
> +		printf("bcm2835: Could not query MAC address\n");
> +		/* Ignore error; not critical */
> +		return 0;
> +	}
> +
> +	eth_setenv_enetaddr("usbethaddr", msg->get_mac_address.body.resp.mac);
> +
> +	return 0;
> +}
> +

Normally this should be within a check for if (!getenv("usbethaddr")).
Any reason to deviate from that?

Regards,
Jeroen