From: Eric Nelson <eric.nelson@boundarydevices.com>
To: u-boot@lists.denx.de
Subject: [U-Boot] Disabling video in bootm (cleanup_before_linux)
Date: Sat, 22 Sep 2012 08:35:38 -0700 [thread overview]
Message-ID: <505DDACA.7070604@boundarydevices.com> (raw)
In-Reply-To: <CAP9ODKraaSGRHm6xFLePjqYVv-7OGa3PMiRvnZ-SCLOGEHsM-g@mail.gmail.com>
On 09/22/2012 06:35 AM, Otavio Salvador wrote:
> On Fri, Sep 21, 2012 at 2:44 PM, Eric Nelson
> <eric.nelson@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.nelson@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/
Regards,
Eric
next prev parent reply other threads:[~2012-09-22 15:35 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-21 16:38 [U-Boot] Disabling video in bootm (cleanup_before_linux) Eric Nelson
2012-09-21 17:22 ` Anatolij Gustschin
2012-09-21 17:44 ` Eric Nelson
2012-09-22 13:35 ` Otavio Salvador
2012-09-22 15:35 ` Eric Nelson [this message]
2012-09-22 15:37 ` Otavio Salvador
2012-09-21 20:36 ` [U-Boot] [PATCH 0/2] i.MX: ipufb: shut down IPU frame buffer before booting O/S Eric Nelson
2012-09-21 20:36 ` [U-Boot] [PATCH 1/2] i.MX: mxc_ipuv3_fb: add ipuv3_fb_shutdown() routine to stop IPU before bootm Eric Nelson
2012-09-22 13:42 ` Otavio Salvador
2012-09-22 14:37 ` Fabio Estevam
2012-09-22 14:39 ` Otavio Salvador
2012-09-23 15:56 ` Stefano Babic
2012-09-23 16:32 ` Dirk Behme
2012-09-23 16:46 ` Eric Nelson
2012-09-23 16:59 ` Fabio Estevam
2012-09-23 17:27 ` Stefano Babic
2012-09-23 18:13 ` [U-Boot] Displays on i.MX (was Re: [PATCH 1/2]) Eric Nelson
2012-09-23 20:12 ` [U-Boot] [PATCH] i2c_probe: update for use in scripting Eric Nelson
2012-10-16 3:58 ` Heiko Schocher
2012-09-23 23:02 ` [U-Boot] [PATCH 0/3] i.MX6: implement hdmidet command Eric Nelson
2012-09-23 23:02 ` [U-Boot] [PATCH 1/3] i.MX6: add HDMI transmitter register declarations from kernel WIP Eric Nelson
2012-09-23 23:02 ` [U-Boot] [PATCH 2/3] i.MX6: Add hdmidet command to detect attached HDMI monitor Eric Nelson
2012-09-23 23:02 ` [U-Boot] [PATCH 3/3] i.MX6: mx6qsabrelite: Include hdmidet command Eric Nelson
2012-10-02 8:28 ` [U-Boot] [PATCH 0/3] i.MX6: implement " Stefano Babic
2012-09-23 18:15 ` [U-Boot] [PATCH 1/2] i.MX: mxc_ipuv3_fb: add ipuv3_fb_shutdown() routine to stop IPU before bootm Sascha Hauer
2012-09-23 17:30 ` [U-Boot] [PATCH V2 0/2] i.MX: ipufb: shut down IPU frame buffer before booting Eric Nelson
2012-09-23 17:30 ` [U-Boot] [PATCH V2 1/2] i.MX: mxc_ipuv3_fb: add ipuv3_fb_shutdown() routine to stop IPU frame buffer Eric Nelson
2012-09-24 8:50 ` Stefano Babic
2012-09-23 17:30 ` [U-Boot] [PATCH V2 2/2] i.MX: shut down video before launch of O/S Eric Nelson
2012-09-24 8:50 ` Stefano Babic
2012-09-21 20:36 ` [U-Boot] [PATCH " Eric Nelson
2012-09-21 22:41 ` Fabio Estevam
2012-09-21 23:02 ` Eric Nelson
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