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

From: Eddie Huang
Date: Wed Nov 11 2015 - 02:56:07 EST

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:

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..


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