On pon, 2014-11-24 at 19:20 -0800, Kevin Hilman wrote:
On Mon, Nov 24, 2014 at 5:50 PM, Kukjin Kim kgene@kernel.org wrote:
Olof Johansson wrote:
On Mon, Nov 24, 2014 at 5:37 PM, Olof Johansson olof@lixom.net wrote:
On Mon, Nov 24, 2014 at 5:35 PM, Kevin Hilman khilman@kernel.org wrote:
On Mon, Nov 24, 2014 at 4:25 PM, Olof Johansson olof@lixom.net wrote:
On Mon, Nov 24, 2014 at 11:51 AM, Kevin Hilman khilman@kernel.org wrote: > > Is anyone at Samsung actually looking into these MCPM issues?
Hi Kevin,
What hardware are you having problems with? 5420 or 5422/5800?
Yes. :)
exynos5420-arndale-octa: http://storage.armcloud.us/kernel-ci/mainline/v3.18-rc6/arm-exynos_defconfig...
arndale-octa.html
exynos5422-odroid-xu3: http://storage.armcloud.us/kernel-ci/mainline/v3.18-rc6/arm-exynos_defconfig...
odroid-xu3.html
My boot tests seem to pass fine because I have such a minimal userspace, but Tyler Baker reported that with a "real" userspace, he can't boot to a shell:
http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/286203....
Hmm...his report was in Sep...I think it should be fine with current -next?
No, it is still broken in linux-next (as I stated above.)
Moreover, earlier in this thread you mentioned you were merging some MCPM patches that should address this, but did not respond when I asked which patches you thing should address this issue
To be honest, since I don't have the exynos5420 arndale, chromebook...but smdk which has different bootloader, I couldn't test it...I'll try to make a test farm like you guys...
Do you have some colleagues with any other 542x hardware? I had assumed that linux-next was being better tested on the publicaly available, and widely available boards like odroid-xu3 and Chromebook2, but I've come to realize the hard way that that is not the case. You mention your board has a different bootloader. Do you suspect there's a bootloader issue on these other platforms? If so, could you elaborate on possible fixes? I'm more than willing to test any proposed fixes, but I'm not familiar enough yet with these SoCs to figure out the underlying issues alone.
Until you have a working board farm, you could start having a closer look at the boot logs we're already producing. Admittedly linux-next broken in many ways besides this one for exynos currently, but it has been having these imprecise aborts well before the other recent issues.
Also, It's very possible that this issue is not even MCPM related at all, and MCPM is just uncovering a previously hidden bug. It would be very helpful if people more familiar with this hardware and SoC would investigate bug reports like these.
Interesting thing can be found in exynos5420.dtsi: mdma1: mdma@11C10000 { ... /* * MDMA1 can support both secure and non-secure * AXI transactions. When this is enabled in the kernel * for boards that run in secure mode, we are getting * imprecise external aborts causing the kernel to oops. */ status = "disabled"; };
I am booting Arndale Octa on some other config and exynos. However with or without MCPM the imprecise aborts are still present (but not fatal, shell comes up).
My board boots also under secure firmware (I am using Linaro's ubuntu image). Maybe that is the cause?
Best regards, Krzysztof