linux-kernel - Re: IMX257 framebuffer problem

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Date:	Mon, 05 Nov 2012 16:21:34 +0100
From:	Stefan Koch <stefan.koch10@...il.com>
To:	linux-kernel@...r.kernel.org
CC:	richard -rw- weinberger <richard.weinberger@...il.com>
Subject: Re: IMX257 framebuffer problem

If I add "video=imxfb:SVGA-16@60" to kernel command line, then there are 
new messages when init fb within BSP file:

Division by zero in kernel.
[<80019ba4>] (unwind_backtrace+0x0/0xf4) from [<8022accc>] (Ldiv0+0x8/0x10)
[<8022accc>] (Ldiv0+0x8/0x10) from [<8022ac9c>] (__aeabi_uidivmod+0x8/0x18)
[<8022ac9c>] (__aeabi_uidivmod+0x8/0x18) from [<80254198>] 
(cfb_imageblit+0x1fc/0x4b0)
[<80254198>] (cfb_imageblit+0x1fc/0x4b0) from [<80251c94>] 
(soft_cursor+0x158/0x1bc)
[<80251c94>] (soft_cursor+0x158/0x1bc) from [<80251664>] 
(bit_cursor+0x4ac/0x4c8)
[<80251664>] (bit_cursor+0x4ac/0x4c8) from [<8024bcd8>] 
(fb_flashcursor+0x108/0x124)
[<8024bcd8>] (fb_flashcursor+0x108/0x124) from [<8003cc00>] 
(process_one_work+0x188/0x4fc)
[<8003cc00>] (process_one_work+0x188/0x4fc) from [<8003d458>] 
(worker_thread+0x130/0x598)
[<8003d458>] (worker_thread+0x130/0x598) from [<80043ef0>] 
(kthread+0x8c/0x98)
[<80043ef0>] (kthread+0x8c/0x98) from [<80015268>] 
(kernel_thread_exit+0x0/0x8)
Division by zero in kernel.
[<80019ba4>] (unwind_backtrace+0x0/0xf4) from [<8022accc>] (Ldiv0+0x8/0x10)
[<8022accc>] (Ldiv0+0x8/0x10) from [<8022ac9c>] (__aeabi_uidivmod+0x8/0x18)
[<8022ac9c>] (__aeabi_uidivmod+0x8/0x18) from [<80254198>] 
(cfb_imageblit+0x1fc/0x4b0)
[<80254198>] (cfb_imageblit+0x1fc/0x4b0) from [<80251c94>] 
(soft_cursor+0x158/0x1bc)
[<80251c94>] (soft_cursor+0x158/0x1bc) from [<80251664>] 
(bit_cursor+0x4ac/0x4c8)
[<80251664>] (bit_cursor+0x4ac/0x4c8) from [<8024bcd8>] 
(fb_flashcursor+0x108/0x124)
[<8024bcd8>] (fb_flashcursor+0x108/0x124) from [<8003cc00>] 
(process_one_work+0x188/0x4fc)
[<8003cc00>] (process_one_work+0x188/0x4fc) from [<8003d458>] 
(worker_thread+0x130/0x598)
[<8003d458>] (worker_thread+0x130/0x598) from [<80043ef0>] 
(kthread+0x8c/0x98)
[<80043ef0>] (kthread+0x8c/0x98) from [<80015268>] 
(kernel_thread_exit+0x0/0x8)
Division by zero in kernel.

Without this command line parameter the "cpsr: 0xffffffff pc: 
0xfffffff9" error still occurs.

The boot works fine when I add the fb_init as you suggested in the 
main.c from kernel.
But I have no /dev/fb0 device. And there are no messages about 
framebuffer in dmesg.

Thanks

Am 05.11.2012 11:43, schrieb richard -rw- weinberger:
> On Mon, Nov 5, 2012 at 11:20 AM, Stefan Koch<stefan.koch10@...il.com>  wrote:
>>> What could be the problem?
> Find out what exactly is happening after calling add_imx_fb().
> Call it a bit later so that you can see everything on the UART.
> You can hack the call into init/main.c or something else...
>

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