[PATCH/RFT renesas-devel] arm64: dts: ulcb: Enable NFS root

[Niklas Söderlund]

Hi Simon,

On 2017-11-30 10:43:55 +0100, Simon Horman wrote:
> On Tue, May 02, 2017 at 11:27:58AM +0200, Geert Uytterhoeven wrote:
> > Hi Simon,
> > 
> > On Tue, May 2, 2017 at 11:24 AM, Simon Horman
> > <horms+renesas at verge.net.au> wrote:
> > > Enable NFS root on the r8a7795/h3ulcb and r8a7796/m3ulcb
> > > as per:
> > > * commit b2407c566ba29215 ("arm64: dts: r8a7795: enable nfs root on Salvator-X board").
> > > * commit 742a9dfb90f0 ("arm64: dts: r8a7796: salvator-x: Enable NFS root")
> > >
> > > Also set ignore_loglevel rw as boot args as is the case for the boards
> > > for the boards for other Renesas ARM/ARM64 based SoCs.
> > 
> > s/for the boards//
> > 
> > > Signed-off-by: Simon Horman <horms+renesas at verge.net.au>
> > 
> > Reviewed-by: Geert Uytterhoeven <geert+renesas at glider.be>
> > 
> > Gr{oetje,eeting}s,
> 
> Sergei has pointed out that bootargs has seems to have effect on ARM64
> kernels. So I think this patch should be withdrawn and we should consider
> removing bootargs from those ARM64 boards where it is present.
> 

I don't think this is true.

I just added a argument to bootargs to salvator-common.dtsi for some 
hack testing and it took effect. Tested on-top of latest renesas-drivers 
and H3 ES2.0.

>>> DIFF <<<
diff --git a/arch/arm64/boot/dts/renesas/salvator-common.dtsi b/arch/arm64/boot/dts/renesas/salvator-common.dtsi
index 7b30044a55367d35..4cb4b44f8be42cb4 100644
--- a/arch/arm64/boot/dts/renesas/salvator-common.dtsi
+++ b/arch/arm64/boot/dts/renesas/salvator-common.dtsi
@@ -42,7 +42,7 @@
        };
 
        chosen {
-               bootargs = "ignore_loglevel rw root=/dev/nfs ip=dhcp";
+               bootargs = "ignore_loglevel rw root=/dev/nfs ip=dhcp adv748x.txbvc=1";
                stdout-path = "serial0:115200n8";
        };
>>> END DIFF <<<

# cat /sys/firmware/devicetree/base/chosen/bootargs
ignore_loglevel rw root=/dev/nfs ip=dhcp adv748x.txbvc=1

And the module parameter had the expected effect on the adv7482x driver.  
Is there another issue here which I'm missing?

-- 
Regards,
Niklas Söderlund