iMX35 3stack framebuffer problem

Boaz Ben-David at
Sun May 29 02:08:58 EDT 2011


Revisiting the issue below, it there a convinient way
to use the FB in barebox without creating a flicker on the LCD in the 
from Barebox to the kernel?



On 03/08/11 09:10, Baruch Siach wrote:
> Hi Boaz,
> On Tue, Mar 08, 2011 at 09:03:55AM +0200, Boaz Ben-David wrote:
>> Yes, I am using the freescale kernel unfotunately.
>> Do you know of some way to fix this (a patch for the freescale kernel
>> maybe)?
> A simple way to check whether this is the problems is to just disable the
> framebuffer in the kernel build, and make sure that you can boot again.
> Then, the fix for this problem is to move the request_irq() call to the end of
> the .probe routine.
> You should not expect any kind of support from Freescale for their released
> Linux kernels.
> baruch
>> On Tue, 2011-03-08 at 16:35 +1100, Marc Reilly wrote:
>>> On Tuesday, March 08, 2011 03:35:10 am Boaz Ben-David wrote:
>>>> Hi,
>>>> When using the iMX35 freescale 3stack we are having some issues with the FB
>>>> driver. On device boot we enable the fb using "fb0.enable=1" and then try
>>>> to boot the kernel from nand. The problem is that after the kernel is
>>>> loaded to RAM and extracted the board hangs. If we do not init the fb0
>>>> device but simply boot the kernel it works fine. Trying "fb0.enable=0"
>>>> before booting also did not help.
>>>> Did anyone encounter this issue yet or are we doing something wrong?
>>> Are you using the freescale kernel? It doesn't handle loading the IPU driver
>>> if the IPU has been enabled previously.. (an IRQ fires before all the driver
>>> structures have been initialized and crashes)
>>> Cheers,
>>> Marc


*Boaz Ben-David*
R&D Engineer


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