linux-kernel - Re: [PATCH v5 4/5] ARM: dts: mt8135: enable basic SMP bringup for mt8135

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Date:	Wed, 11 Nov 2015 15:55:57 +0800
From:	Eddie Huang <eddie.huang@...iatek.com>
To:	Kevin Hilman <khilman@...nel.org>
CC:	Yingjoe Chen <yingjoe.chen@...iatek.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	<srv_heupstream@...iatek.com>, Arnd Bergmann <arnd@...db.de>,
	Tyler Baker <tyler.baker@...aro.org>,
	Stephen Boyd <sboyd@...eaurora.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Olof Johansson <olof@...om.net>,
	Rob Herring <robh+dt@...nel.org>,
	<linux-mediatek@...ts.infradead.org>,
	Sascha Hauer <kernel@...gutronix.de>,
	Matthias Brugger <matthias.bgg@...il.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 4/5] ARM: dts: mt8135: enable basic SMP bringup for
 mt8135

Hi Kevin,

On Tue, 2015-11-10 at 17:16 -0800, Kevin Hilman wrote:
> Hi Eddie,
> 
> [...]
> 
> > I check the log [0],
> 
> Thanks for checking into this boot failure.
> 
> > it seems first time mt8135-evbp1 boot to kernel
> > shell successfully, then boot again. In the second time, mt8135 stay in
> > fastboot mode, waiting host send boot image, then timeout.
> 
> Actually, it never gets to a shell the first time.  If you look closely,
> the target reboots as soon as userspace starts.   Look for the PYBOOT
> line which says "finished booting, starting userspace"
> 
> Later on, pyboot thinks it finds a root shell due to finding '#'
> characters, but clearly it never got to a shell.
> 
> > I download zImage and dtb in [1], and kernel run to shell successfully
> > on my platform.
> 
> Are you can you try using a ramdisk as well?  You can use the pre-built
> one here:
> http://storage.kernelci.org/images/rootfs/buildroot/armel/rootfs.cpio.gz
> 

Yes, I tried this ramdisk, and I can reproduce fail issue.

> Please check my boot logs to see how I'm generating the boot.img file
> (search for mkbootimg) with a kernel/dtb/ramdisk.  It may be possible
> that the kernel image size with a ramdisk is breaking some of the
> assumptions in the fastboot mode.  I've seen problems like this on other
> platforms due to hard-coded sizes/addresses in the boot firmware.
> 

MT8135 allocate 10MB for BOOT partition, but the test boot.img is 11MB,
thus cause user space fail. I will prepare new firmware that extend BOOT
partition to 16MB. and put new firmware on Howard's github. I will mail
to you when I am ready..

Eddie
Thanks


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