From mboxrd@z Thu Jan 1 00:00:00 1970 From: ilya@compulab.co.il (Ilya Ledvich) Date: Tue, 16 Feb 2016 09:56:47 +0200 Subject: iMX7d cpu1 issue Message-ID: <56C2D63F.1030408@compulab.co.il> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi Shawn, I'm working on Compulab CL-SOM-IMX7 device (http://www.compulab.co.il/products/computer-on-modules/cl-som-imx7-freescale-i-mx-7-system-on-module) based on Freescale iMX7d CPU. I use the Freescale latest BSP imx_3.14.52_1.1.0_ga and the Linux mainline v4.4-rc6 as a reference. I observe an issue with bringing up the second CPU core. Briefly, the kernel can successfully boot only when CPU1 fails to come online. In this case the boot log shows the following messages: ... CPU1: failed to come online Brought up 1 CPUs SMP: Total of 1 processors activated (6.00 BogoMIPS). ... Otherwise, the device tries to start kernel several times until the boot process eventually crashes. Please see attached logs for more details. This never happens on mainline Linus kernel, because it never tries to bring up CPU1. Unfortunately, we cannot verify this behavior on reference board cause we have no one. Have you ever seen such behavior? Could you please advice something? Kind regards, Ilya. -------------- next part -------------- A non-text attachment was scrubbed... Name: cl-som-imx7-boot-ok.log Type: text/x-log Size: 14933 bytes Desc: not available URL: -------------- next part -------------- A non-text attachment was scrubbed... Name: cl-som-imx7-boot-failed.log Type: text/x-log Size: 21571 bytes Desc: not available URL: