[U-Boot] [PATCH v3 1/2] spl: rk3399: disable DDR security regions for SPL (for DMA in dw_mmc)

From: Simon Glass <sjg@chromium.org>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH v3 1/2] spl: rk3399: disable DDR security regions for SPL (for DMA in dw_mmc)
Date: Fri, 31 Mar 2017 22:23:38 -0600	[thread overview]
Message-ID: <CAPnjgZ0Tc1+bhNKr_mjd=YoMvXtCbxASyibpVwF0sitf-96o-w@mail.gmail.com> (raw)
In-Reply-To: <1490815229-40730-1-git-send-email-philipp.tomsich@theobroma-systems.com>

On 29 March 2017 at 13:20, Philipp Tomsich
<philipp.tomsich@theobroma-systems.com> wrote:
> The RK3399 hangs during DMA of the Designware MMC controller, when
> performing DMA-based transactions in SPL due to the DDR security settings
> left behind by the BootROM (i.e. accesses to the first MB of DRAM are
> restricted... however, the DMA is likely to target this first MB, as it
> transfers from/to the stack).
>
> System security is not affected, as the final security configuration is
> performed by the ATF, which is executed after the SPL stage.
>
> With this fix in place, we can now drop 'fifo-mode' in the DTS for the
> RK3399-Q7 (Puma).
>
> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
>
> ---
>
> Changes in v3:
> - replaces the work-around (i.e. falling back to fifo-mode in SPL) with
>   a permanent fix
>
>  arch/arm/mach-rockchip/rk3399-board-spl.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)

Acked-by: Simon Glass <sjg@chromium.org>