From mboxrd@z Thu Jan 1 00:00:00 1970 From: Santosh Shilimkar Subject: Re: OMAP4430 SDP boot issues.. (Was Re: OMAP2430 SDP boot broken after Linus' rmk merge) Date: Wed, 24 Jul 2013 14:17:07 -0400 Message-ID: <51F01A23.2060502@ti.com> References: <20130722184325.GA21614@n2100.arm.linux.org.uk> <51EE2AA7.5060503@ti.com> <51EE474D.5070804@ti.com> <20130724135617.GI11072@mudshark.cambridge.arm.com> <51EFE1DD.8070801@ti.com> <20130724145237.GB21614@n2100.arm.linux.org.uk> <51EFF571.3070106@ti.com> <20130724172321.GC21614@n2100.arm.linux.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit Return-path: Received: from bear.ext.ti.com ([192.94.94.41]:58099 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752130Ab3GXSRq (ORCPT ); Wed, 24 Jul 2013 14:17:46 -0400 In-Reply-To: <20130724172321.GC21614@n2100.arm.linux.org.uk> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Russell King - ARM Linux Cc: Will Deacon , Rajendra Nayak , Paul Walmsley , "linux-omap@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Balaji T Krishnamoorthy , Tomi Valkeinen , Archit Taneja , "Balbi, Felipe" , Tony Lindgren On Wednesday 24 July 2013 01:23 PM, Russell King - ARM Linux wrote: > On Wed, Jul 24, 2013 at 11:40:33AM -0400, Santosh Shilimkar wrote: >> On Wednesday 24 July 2013 10:52 AM, Russell King - ARM Linux wrote: >>> I also continue to be disappointed by the lack of things working on the >>> 4430 - it's been a number of years now and _still_ the on-board LCDs do >>> not work. People have tried to blame that on hardware faults and the >>> like, but they're just being idiotic when they say stuff like that. It >>> can't be hardware faults when the kernel supplied with the board is able >>> to make them work to the extent that userspace can play back video on all >>> three output devices simultaneously, without hiccup or any imperfection. >>> I don't know whether it's just that the backlight support isn't working >>> or what - because any information on the 4430 seems to be a tightly >>> controlled secret that only a few select people are permitted to know >>> about. As far as I'm concerned, much of the hardware is a black box to >>> me. >>> >> On the display related issues, Tomi and Archit have been sorting out >> issue but am not sure about the current state. If the pre-built binaries >> video playback works means your hardware seems to be fine. > > Just let me be absolutely crystal clear about this: the on-board LCDs > have _never_ worked with a mainline kernel, but they did work with the > kernel which originally came with the board with the original 4430 SoC. > I can right now put the original 4430 SoC back on the board and boot > using the kernel which is still on the SD card and they will work. > > Even with the original 4430 SoC and mainline kernels, they have never > worked. > > I tried it back and forth several times, but even with this, the > explanation was always "your hardware must be faulty". And then the wrong > voltage levels was found which was preventing the LCD modules from even > being recognised... but still, no sign of life on the LCD panels. > > It may be that there's some error in the kernel configuration I'm building. > I don't know, because I have _no_ idea what hardware is involved in > bringing the LCDs online. Like I said above, the 4430SDP board is just > a black box. I am totally reliant on others telling me what the right > config options are supposed to be and fixing problems when things don't > work. > > With the lack of information on this board, all I can do when things don't > work is whinge and moan at people. I am powerless to debug the problems > myself, even if they're a simple misconfiguration. > > Is there information available on the 4430SDP? Is there any reason I > can't have access to it? > I haven't come across the information which is available on the web. Let me check if there are schematics which i can send across to you. Regards, Santosh From mboxrd@z Thu Jan 1 00:00:00 1970 From: santosh.shilimkar@ti.com (Santosh Shilimkar) Date: Wed, 24 Jul 2013 14:17:07 -0400 Subject: OMAP4430 SDP boot issues.. (Was Re: OMAP2430 SDP boot broken after Linus' rmk merge) In-Reply-To: <20130724172321.GC21614@n2100.arm.linux.org.uk> References: <20130722184325.GA21614@n2100.arm.linux.org.uk> <51EE2AA7.5060503@ti.com> <51EE474D.5070804@ti.com> <20130724135617.GI11072@mudshark.cambridge.arm.com> <51EFE1DD.8070801@ti.com> <20130724145237.GB21614@n2100.arm.linux.org.uk> <51EFF571.3070106@ti.com> <20130724172321.GC21614@n2100.arm.linux.org.uk> Message-ID: <51F01A23.2060502@ti.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Wednesday 24 July 2013 01:23 PM, Russell King - ARM Linux wrote: > On Wed, Jul 24, 2013 at 11:40:33AM -0400, Santosh Shilimkar wrote: >> On Wednesday 24 July 2013 10:52 AM, Russell King - ARM Linux wrote: >>> I also continue to be disappointed by the lack of things working on the >>> 4430 - it's been a number of years now and _still_ the on-board LCDs do >>> not work. People have tried to blame that on hardware faults and the >>> like, but they're just being idiotic when they say stuff like that. It >>> can't be hardware faults when the kernel supplied with the board is able >>> to make them work to the extent that userspace can play back video on all >>> three output devices simultaneously, without hiccup or any imperfection. >>> I don't know whether it's just that the backlight support isn't working >>> or what - because any information on the 4430 seems to be a tightly >>> controlled secret that only a few select people are permitted to know >>> about. As far as I'm concerned, much of the hardware is a black box to >>> me. >>> >> On the display related issues, Tomi and Archit have been sorting out >> issue but am not sure about the current state. If the pre-built binaries >> video playback works means your hardware seems to be fine. > > Just let me be absolutely crystal clear about this: the on-board LCDs > have _never_ worked with a mainline kernel, but they did work with the > kernel which originally came with the board with the original 4430 SoC. > I can right now put the original 4430 SoC back on the board and boot > using the kernel which is still on the SD card and they will work. > > Even with the original 4430 SoC and mainline kernels, they have never > worked. > > I tried it back and forth several times, but even with this, the > explanation was always "your hardware must be faulty". And then the wrong > voltage levels was found which was preventing the LCD modules from even > being recognised... but still, no sign of life on the LCD panels. > > It may be that there's some error in the kernel configuration I'm building. > I don't know, because I have _no_ idea what hardware is involved in > bringing the LCDs online. Like I said above, the 4430SDP board is just > a black box. I am totally reliant on others telling me what the right > config options are supposed to be and fixing problems when things don't > work. > > With the lack of information on this board, all I can do when things don't > work is whinge and moan at people. I am powerless to debug the problems > myself, even if they're a simple misconfiguration. > > Is there information available on the 4430SDP? Is there any reason I > can't have access to it? > I haven't come across the information which is available on the web. Let me check if there are schematics which i can send across to you. Regards, Santosh