Re: Error opening framebuffer device

[Florian Fainelli <florian.fainelli@telecomint.eu>]

Hi,

On Tuesday 09 October 2007 10:45:43 kaka wrote:
> *Hi All,*
>
> *While running  the cross compiled directFB example on MIPS chip,*
>
> *
> We tried to install the framebuffer driver(command given at the
> bottom) and we have already created the node fb0.*

Looking at the insmod below, I think the framebuffer did not register 
correctly, so creating the device will not help if the driver is not 
registered.

> # insmod brcmstfb.ko
> brcmstfb: Unknown symbol unregister_framebuffer
> brcmstfb: Unknown symbol BKNI_EnterCriticalSection_tagged
> brcmstfb: Unknown symbol printf
> brcmstfb: Unknown symbol BKNI_DestroyEventGroup
> brcmstfb: Unknown symbol BKNI_WaitForEvent_tagged
> brcmstfb: Unknown symbol BKNI_Printf
> brcmstfb: Unknown symbol __divsf3
> brcmstfb: Unknown symbol BKNI_Vprintf
> brcmstfb: Unknown symbol BKNI_Memset
> brcmstfb: Unknown symbol bnetif_dma_data
> brcmstfb: Unknown symbol bnetif_dma_delete_filter
> brcmstfb: Unknown symbol cleanup_bnetif_dma
> brcmstfb: Unknown symbol BKNI_AcquireMutex_tagged
> brcmstfb: Unknown symbol malloc
> brcmstfb: Unknown symbol BKNI_DestroyMutex
> brcmstfb: Unknown symbol framebuffer_alloc
> brcmstfb: Unknown symbol BKNI_RemoveEventGroup
> brcmstfb: Unknown symbol BKNI_Malloc_tagged
> brcmstfb: Unknown symbol BKNI_CreateEventGroup
> brcmstfb: Unknown symbol BKNI_WaitForGroup
> brcmstfb: Unknown symbol __extendsfdf2
> brcmstfb: Unknown symbol BKNI_SetEvent_tagged
> brcmstfb: Unknown symbol BKNI_Memcpy
> brcmstfb: Unknown symbol BKNI_LinuxKernel_SetIsrTasklet
> brcmstfb: Unknown symbol BKNI_Memcmp
> brcmstfb: Unknown symbol fb_find_mode
> brcmstfb: Unknown symbol fb_dealloc_cmap
> brcmstfb: Unknown symbol bnetif_dma_stop
> brcmstfb: Unknown symbol BKNI_ResetEvent_tagged
> brcmstfb: Unknown symbol BKNI_CreateMutex
> brcmstfb: Unknown symbol BKNI_CreateEvent_tagged
> brcmstfb: Unknown symbol __floatsisf
> brcmstfb: Unknown symbol brcm_dir_entry
> brcmstfb: Unknown symbol register_framebuffer
> brcmstfb: Unknown symbol BKNI_Fail
> brcmstfb: Unknown symbol fb_alloc_cmap
> brcmstfb: Unknown symbol BKNI_Snprintf
> brcmstfb: Unknown symbol BKNI_Delay_tagged
> brcmstfb: Unknown symbol BKNI_LeaveCriticalSection_tagged
> brcmstfb: Unknown symbol BKNI_Sleep_tagged
> brcmstfb: Unknown symbol bnetif_dma_add_filter
> brcmstfb: Unknown symbol BKNI_Free_tagged
> brcmstfb: Unknown symbol BKNI_DestroyEvent_tagged
> brcmstfb: Unknown symbol init_bnetif_dma
> brcmstfb: Unknown symbol framebuffer_release
> brcmstfb: Unknown symbol BKNI_AddEventGroup
> brcmstfb: Unknown symbol BKNI_ReleaseMutex_tagged
> brcmstfb: Unknown symbol __addsf3
> brcmstfb: Unknown symbol free
> insmod: cannot insert `brcmstfb.ko': Unknown symbol in module (2): No
> such file or directory
> #

Did you compile framebuffer support for your kernel ? Because if yes, most 
symbols (I did not check all) used by your drivers seems to be exported with 
EXPORT_SYMBOL, and not EXPORT_SYMBOL_GPL, so your driver, even with a 
proprietary license should be able to access them.

I would recommend you mention your linux version, and the relevant kernel 
configuration parts.