[rtems-users] microwindows 0.90-rtems 4.7-pc386 - executing demo problems

[Joel Sherrill <joel@OARcorp.com>]

Mark Mussetter wrote:
> We got that error when we were getting started as well.  Turned out that 
> we needed to actually create and install a framebuffer driver 
> (/dev/fb0).  Using Rosimildo da Silva's patch for rtems as a starting 
> point, this is what we had to do:
> 
> 1) In rtemscfg.h, changed the CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS  
> define to allow more devices.
> 2) Added MY_FRAMEBUFFER_DRIVER_TABLE_ENTRY to the Device_drivers table
> 3) Defined MY_FRAMEBUFFER_DRIVER_TABLE_ENTRY in framebuffer_driver.h
> 4) Wrote functions FB_Initialize, FB_Open, FB_Close, and FB_Control.
> 
> Everything else is pretty hardware specific but this should get you 
> started.

Can you post your build and configure options for using MicroWindows
to the Wiki?

FWIW it would be nice if we could get a /dev/fb0 implementation for
the pc386 BSP which is appropriately licensed.

--joel

> Hope this helps,
> 
> Mark
> 
> 
> ==================================
> 
> 
> /* In rtemscfg.h (Values that override settings in confdefs.h) */
> 
> ...
> 
> #define CONFIGURE_LIBIO_MAXIMUM_FILE_DESCRIPTORS  10 /* overriding 
> confdefs value of 3, so can install our devices including /dev/fb0 */
> 
> ...
> 
> /* List of device drivers loaded by RTEMS at boot time */
> rtems_driver_address_table Device_drivers[] =
> {
>   CONSOLE_DRIVER_TABLE_ENTRY,
>   CLOCK_DRIVER_TABLE_ENTRY,
> 
> /* this can be a bit tricky if you are using a serial mouse,
>    make sure that you do not install and serial driver that
>    uses the same port !!!!
> */
> #if 0
>   TTY2_DRIVER_TABLE_ENTRY,
> 
>     #if PS2_MOUSE
>       PAUX_DRIVER_TABLE_ENTRY,
>     #else
>       /*
>        * Make sure that you have selected the COM port and the
>        * mouse type in ( 
> c/src/lib/libbsp/i386/pc386/console/serial_mouse.h ).
>       */
>       SERIAL_MOUSE_DRIVER_TABLE_ENTRY,
>     #endif
>   /* Standard VGA driver */
>   FBVGA_DRIVER_TABLE_ENTRY,
> #else
>   {NULL,NULL,NULL,NULL,NULL,NULL},
>   {NULL,NULL,NULL,NULL,NULL,NULL},
>   {NULL,NULL,NULL,NULL,NULL,NULL},
> #endif
>   {NULL,NULL,NULL,NULL,NULL,NULL},
>   MY_FRAMEBUFFER_DRIVER_TABLE_ENTRY,
>   MY_ADS_DRIVER_TABLE_ENTRY,
>   PTY_DRIVER_TABLE_ENTRY
> };
> 
> #include <confdefs.h>
> 
> ==================================
> 
> /*In framebuffer.h */
> 
> rtems_device_driver FB_Open( rtems_device_major_number major,
>                                  rtems_device_minor_number minor,
>                                  void *args );
> 
> 
> rtems_device_driver FB_Close( rtems_device_major_number major,
>                          rtems_device_minor_number minor,
>                          void *args );
> 
> 
> rtems_device_driver FB_Control( rtems_device_major_number major,
>                           rtems_device_minor_number minor,
>                           void *args );
> 
> 
> rtems_device_driver FB_Initialize( rtems_device_major_number major,
>                                  rtems_device_minor_number minor,
>                                  void *args );
> 
> 
> //When using the following driver setup, we don't need a read or write 
> function since the subdriver "fblinx.c" handles the pixels directly
> #define MY_FRAMEBUFFER_DRIVER_TABLE_ENTRY \
> { FB_Initialize, FB_Open, FB_Close, NULL, NULL, FB_Control }
> 
> ==================================
> 
> 
> At 08:20 AM 2/5/2005, you wrote:
> 
>> Hello all,
>>
>> I've compiled microwindows demo for pc386 bsp.
>>
>> Trying to run wdemo on real pc and bochs too, I found problem in 
>> getting access to /dev/fb0.
>>
>> In microwindows/src/scr_rtems.c :
>>
>> ....
>> static PSD
>> fb_open(PSD psd)
>> {
>>         char *  env;
>>         int     type, visual;
>>         int     tty;
>>         PSUBDRIVER subdriver;
>>         struct fb_screeninfo fb_info;
>>
>>         assert(status < 2);
>>
>>         /* locate and open framebuffer, get info*/
>>         if(!(env = getenv("FRAMEBUFFER")))
>>                 env = "/dev/fb0";
>>         fb = open( env, O_RDWR);
>>         if(fb < 0) {
>>                 EPRINTF("Error opening %s: %m\n", env);
>>      return NULL;
>>   }
>>
>> Call to open() always returns -1.
>>
>> Anyone may help?
>>
>> Thanks.
>>
>> Luca
> 
> Mark Mussetter
> Link Communications, Inc.
> 1035 Cerise Rd
> Billings, MT 59101-7378
> phone: (406) 245-5002 ext 105
> Fax:    (406) 245-4889
> WWW: http://www.link-comm.com
> MailTo:mark at link-comm.com
> 
> 


-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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