From mboxrd@z Thu Jan  1 00:00:00 1970
From: Albert ARIBAUD <albert.u.boot@aribaud.net>
Date: Tue, 21 Jul 2015 09:24:50 +0200
Subject: [U-Boot] [PATCH 1/5] arm: mvebu: Add SPL SDIO/MMC boot support
In-Reply-To: <1437384040-16244-1-git-send-email-sr@denx.de>
References: <1437384040-16244-1-git-send-email-sr@denx.de>
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Hello Stefan,

On Mon, 20 Jul 2015 11:20:36 +0200, Stefan Roese <sr@denx.de> wrote:
> This patch adds basic SDIO/MMC booting support to MVEBU SoC's. Since
> I don't know of a way to test the boot-device upon runtime, this patch
> hardcodes the spl_boot_device instead.

Not sure about 6820, but for 6710 this info can be traced back from the
functional spec [1] to the device data sheet [2] as the sample-at-reset
(SAR) data, which (for the 6710 at least) is an embedded XLS sheet [3].
Maybe you can find the same info for 6820?

For 6710:

[1] "88F6710, 88F6707, and 88F6W11 ARMADA ? 370 SoC Functional
    Specifications ? Unrestricted"
    Doc. No. MV-S107979-U0, Rev. B

[2] "88F6710, 88F6707, and 88F6W11 ARMADA ? 370 SoC Hardware
    Specifications"
    Doc. No. MV-S107978-00, Rev. G

[3] "Sample at Reset Table" and "Boot Source List" tabs in 
    88F6707_Pin_information.xls

Amicalement,
-- 
Albert.