On Sat, Sep 22, 2012 at 12:35 PM, Eric Nelson <eric.nel...@boundarydevices.com> wrote: > On 09/22/2012 06:35 AM, Otavio Salvador wrote: >> >> On Fri, Sep 21, 2012 at 2:44 PM, Eric Nelson >> <eric.nel...@boundarydevices.com> wrote: >>> >>> On 09/21/2012 10:22 AM, Anatolij Gustschin wrote: >>>> >>>> >>>> Hi Eric, >>>> >>>> On Fri, 21 Sep 2012 09:38:23 -0700 >>>> Eric Nelson<eric.nel...@boundarydevices.com> wrote: >>>> >>>>> Hi all, >>>>> >>>>> While looking into some trouble booting the latest Linux kernel patches >>>>> for i.MX6 display support, I found that the kernel driver was thrown >>>>> off >>>>> by >>>>> the interrupt status bits in the i.MX6 IPU. >>>>> >>>>> Until and unless we have the ability to hand off a 'live' display, it >>>>> seems >>>>> that we should disable the video driver as a part of the 'bootm' >>>>> process. >>>>> >>>>> At the very least, doing this will avoid the possibility of trash on >>>>> the >>>>> display during the transition. >>>>> >>>>> I've been looking, and I don't see a place to tap into this process. >>>>> It seems that having a shutdown routine for the display drivers >>>>> (cfb_console?) is the way to go. >>>> >>>> >>>> >>>> cfb_console driver is a renderer of the characters and bitmaps >>>> to the framebuffer memory and is not a good place for a shutdown >>>> routine, I think. But we can add a shutdown function to the IPU >>>> driver drivers/video/mxc_ipuv3_fb.c and call it before booting. >>>> bootm code in common/cmd_bootm.c has a weak arch_preboot_os() >>>> function that can be overridden by platform specific preboot >>>> routine. We could define a preboot function in >>>> >>>> arch/arm/cpu/armv7/mx6/soc.c >>>> or in >>>> arch/arm/cpu/armv7/imx-common/cpu.c >>>> >>>> and call IPU shutdown routine in it. >>>> >>> >>> Thanks Anatolij. >>> >>> This is just what we need. I'll send a patch shortly. >> >> >> It would be nice to try to add support for mx5 too so we fix same boot >> hungs in mx5 kernels. I am adding Fabio in CC as he knows more about >> it. >> > > Hi Otavio, > > I believe it will work on MX5 boards as well, though I haven't tested. > http://patchwork.ozlabs.org/patch/185928/
Yes; Fabio tested it and it proved to work. -- Otavio Salvador O.S. Systems E-mail: ota...@ossystems.com.br http://www.ossystems.com.br Mobile: +55 53 9981-7854 http://projetos.ossystems.com.br _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
