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. -- 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
