RE: [PATCH] ARM: dts: add exynos5422.dtsi to correct cpu order

[Chanho Park <chanho61.park@samsung.com>]

Hi,

> -----Original Message-----
> From: Joonyoung Shim [mailto:jy0922.shim@samsung.com]
> Sent: Thursday, May 28, 2015 10:59 AM
> To: Chanho Park; kgene@kernel.org; k.kozlowski@samsung.com
> Cc: cw00.choi@samsung.com; linux-samsung-soc@vger.kernel.org;
> javier.martinez@collabora.co.uk; khilman@linaro.org;
> sjoerd.simons@collabora.co.uk; heesub.shin@samsung.com
> Subject: Re: [PATCH] ARM: dts: add exynos5422.dtsi to correct cpu order
> 
> Hi Chanho,
> 
> On 05/28/2015 12:15 AM, Chanho Park wrote:
> > The odroid-xu3 board which is based on exynos5422 not exynos5800 is
> > booted from cortex-a7 core unlike exynos5800. The odroid-xu3's cpu
> order
> > is quite strange. cpu0 and cpu5-7 are cortex-a7 cores and cpu1-4 are
> > cortex-a15 cores. To correct this mis-odering, I added exynos5422.dtsi
> > and reversing cpu orders from exynos5420. Now, cpu0-3 are cortex-a7
> and
> > cpu4-7 are cortex-a15.
> 
> The exynos5422 SoC can boot using cortex-a15 cpu depending on gpio
> GPG2CON[1],

Yes, But, the pin is not controllable because it's checked in  the iROM
area.

> i think this is just Odroid-XU3 board problem. Is it
> possible to overwrite cpus information directly from
> exynos5422-odroidxu3.dts?

It's possible to override the info in the odroidxu3.dts. As you know,
however, a new exynos5422 board will be added soon. The board also has same
configuration of the gpio pin and booted cpu0 from a cortex-a7 core.

BTW, booting of secondary cpus are still broken. Is there any progress of
the patch[1]?
This patch is also generated top of the patch with some fixes.

[1]. http://www.spinics.net/lists/linux-samsung-soc/msg39523.html

Best Regards,
Chanho Park