Messages in this thread | | | Date | Mon, 05 Nov 2012 16:21:34 +0100 | From | Stefan Koch <> | Subject | Re: IMX257 framebuffer problem |
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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@gmail.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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