From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wi0-x233.google.com ([2a00:1450:400c:c05::233]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1ZdusE-0006U9-Tv for barebox@lists.infradead.org; Mon, 21 Sep 2015 06:46:51 +0000 Received: by wicge5 with SMTP id ge5so101353012wic.0 for ; Sun, 20 Sep 2015 23:46:29 -0700 (PDT) Received: from desktop (p57ACD406.dip0.t-ipconnect.de. [87.172.212.6]) by smtp.gmail.com with ESMTPSA id w1sm10427533wjz.37.2015.09.20.23.46.28 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Sun, 20 Sep 2015 23:46:28 -0700 (PDT) Date: Mon, 21 Sep 2015 08:46:27 +0200 Message-Id: <87h9moclrw.fsf@gmail.com> From: Holger Schurig List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: BUG, i.MX: broken LVDS display To: barebox@lists.infradead.org Hi, on my i.MX6Q device barebox 2015-08.0 worked and I had an output on the splash screen, both in Barebox and later in Linux (there with CONFIG_STAGING, CONFIG_DRM_IMX, DRM_IMX_FB_HELPER, DRM_IMX_LDB, DRM_IMX_IPUV3). This stopped with 2015-09.0. I even get a null-pointer exception: Barebox: version 2015.09.0, DLoG 2015-09.1-9-g498cf3a unable to handle NULL pointer dereference at address 0x00000008 pc : [<4fe1072a>] lr : [<4fe10719>] sp : 4ffffa18 ip : 4ffffa68 fp : 4ffffd80 r10: 3032678c r9 : 00000000 r8 : 00000000 r7 : 30343904 r6 : 303438b8 r5 : 00000000 r4 : 303438b8 r3 : 00000000 r2 : 4fe31c78 r1 : 00000000 r0 : 00000006 Flags: nzcv IRQs off FIQs off Mode SVC_32 [<4fe1072a>] (ipu_crtc_mode_set+0x2a/0x1cc) from [<4fe108f5>] (ipufb_enable_controller+0x29/0x44) [<4fe108f5>] (ipufb_enable_controller+0x29/0x44) from [<4fe0e8e5>] (fb_enable_set+0x15/0x18) [<4fe0e8e5>] (fb_enable_set+0x15/0x18) from [<4fe1bd6d>] (param_int_set+0x33/0x44) [<4fe1bd6d>] (param_int_set+0x33/0x44) from [<4fe1bfab>] (dev_set_param+0x43/0x50) [<4fe1bfab>] (dev_set_param+0x43/0x50) from [<4fe03257>] (setenv+0x37/0xac) [<4fe03257>] (setenv+0x37/0xac) from [<4fe056cb>] (set_local_var.isra.3+0x37/0x4c) [<4fe056cb>] (set_local_var.isra.3+0x37/0x4c) from [<4fe0622d>] (run_list_real+0x2ed/0x628) [<4fe0622d>] (run_list_real+0x2ed/0x628) from [<4fe061c5>] (run_list_real+0x285/0x628) [<4fe2d7cd>] (unwind_backtrace+0x1/0x74) from [<4fe00d65>] (panic+0x1d/0x2c) [<4fe00d65>] (panic+0x1d/0x2c) from [<4fe2dca1>] (do_exception+0xd/0x10) [<4fe2dca1>] (do_exception+0xd/0x10) from [<4fe2dd09>] (do_data_abort+0x21/0x2c) [<4fe2dd09>] (do_data_abort+0x21/0x2c) from [<4fe2d9d4>] (do_abort_6+0x48/0x54) I think (!) this is because of commit "video: ipuv3: Replace ipu_output with VPL". My current device tree looks like this: &ldb { status = "okay"; lvds-channel@0 { status = "okay"; crtc = "ipu1-di0"; fsl,data-mapping = "spwg"; fsl,data-width = <18>; primary; display-timings { native-mode = <&timing0>; timing0: AM-800600K1TMQW-01H-B { // dot clock: 40 - 50 MHz clock-frequency = <39701664>; // 72 Hz hactive = <800>; vactive = <600>; hsync-len = <3>; // 1 - 40 hback-porch = <46>; // 46 hfront-porch = <18>; // 16 - 354 vsync-len = <10>; // 1 - 29 vback-porch = <23>; // 23 vfront-porch = <3>; // 1 - 77 hsync-active = <1>; }; }; }; } I experimented with barebox 2015.09.0 with several things, but so far haven't been successfull. Any hint on how the device tree is now supposed to look like? _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox