Hyp mode in chromeos-3.8

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newbie_osdev

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May 11, 2013, 11:48:28 PM5/11/13

to chromiu...@chromium.org

Hi,

The u-boot boots kernel in HYP mode ( i think so - uboot log says so as well ) .
However, kernel dmesg log still says " All processors in SVC mode"

I wonder how to ensure that it is at least non secure SVC and what makes it

enter SVC from HYP?

Any help will be appreciated

Arthy Sundaram

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May 12, 2013, 1:42:07 PM5/12/13

to Ronald Minnich, Chromium OS dev

oops, sorry.

ARM Samsung chromebook - exynos5250-snow

On Sun, May 12, 2013 at 1:38 PM, Ronald Minnich <rmin...@google.com> wrote:

what platform are you talking about here? arm, x86, what chromebook?

ron

Olof Johansson

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May 12, 2013, 10:51:25 PM5/12/13

to newbie_osdev, Chromium OS dev

The u-boot that comes with the Chromebook does not start the processors in HYP mode. Neither does the 3.4 kernel handle entry in HYP mode properly.

-Olof

2013/5/11 newbie_osdev <arthys...@gmail.com>

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Arthy Sundaram

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May 12, 2013, 10:57:31 PM5/12/13

to Olof Johansson, Chromium OS dev

Hi Olof,

I have modified Alex's u-boot to start Chromebook in HYP mode. I do see hvc calls getting through but when the kernel boots,

the famous "All CPUs in SVC mode" confuses me.

Your help will be much appreciated. I use Chromium 3.8 kernel "uImage" and it does have support of HYP mode isnt it. And it allows kernel

booted in HYP mode to stay in HYP mode ?

Olof Johansson

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May 13, 2013, 1:28:50 AM5/13/13

to Arthy Sundaram, Chromium OS dev

2013/5/12 Arthy Sundaram <arthys...@gmail.com>

Hi Olof,

I have modified Alex's u-boot to start Chromebook in HYP mode. I do see hvc calls getting through but when the kernel boots,
the famous "All CPUs in SVC mode" confuses me.

I don't know what u-boot this is. Alexander Graf's? Or someone else?

Your help will be much appreciated. I use Chromium 3.8 kernel "uImage" and it does have support of HYP mode isnt it. And it allows kernel
booted in HYP mode to stay in HYP mode ?

Yes, 3.8 should handle it fine, minus any bugs in there. Seems suspiciously like the kernel didn't actually enter in hyp mode properly though.

-Olof

Arthy Sundaram

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May 13, 2013, 1:35:54 AM5/13/13

to Olof Johansson, Chromium OS dev

Thank you.

Yes I Alexander Graf's u-boot, took changes for hypmode entry from Arndale and Linaro repo.

How do I verify the seconday cpu's smp kick in address - CONFIG_SYSFLAGS_ADDR for this board?