2008-04-19 05:53:51 /dev/fb0 missing
Harvind Singh (INDIA)
Message: 54555
Dear all,
I am trying to interface TFT LCD panel with BF561 Ezkit.
I have made the changes in /drivers/video/bfin-t350mcqb-fb.c to suit the timings of TFT
I have done following selections in menuconfig
Device drivers------->
Graphics support------------>
[ * ]Backlight and LCD device support---------->
< * >Lowlevel Backlight controles
< * >Low level LCD controls
< * >Support for frame buffer devices
< * >Varitronics COG-T350MCQB TFT LCD display (BF527 EZKIT)
with above configuration I built the image sucessfully and the kernel is booting up.
but /dev/fb0 is missing
if i do
root:/>cat /proc/devices
Character devices:
1 mem
5 /dev/tty
................
................
29 fb
................
................
204 ttyBF
Block devices:
1 ramdisk
31 mtdblock
Pls help me out.
Thanks
Harvind singh
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2008-04-21 02:26:50 Re: /dev/fb0 missing
Yi Li (CHINA)
Message: 54587 By default mdev will create the device node. It is possible that your driver does not set up correctly.
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2008-04-22 08:03:56 Re: /dev/fb0 missing
Harvind Singh (INDIA)
Message: 54728
Hi Li,
In the file /drivers/video/bf-t350mcqb-fb.c i have converted all the PPI's to PPI0
for eg:-
bfin_write_PPI_DELAY() modified to bfin_write_PPI0_DELAY()
bfin_write_PPI_CONTROL() modified to bfin_write_PPI0_CONTROL()
etc.
I have made no changes in config and make file.
Is any thing else required to set up driver correctly ?
pls help.
Thanks,
Harvind singh
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2008-04-22 08:21:03 Re: /dev/fb0 missing
Robin Getz (UNITED STATES)
Message: 54729 Harvind:
There are sometimes differences in PPI - that may require some other minor changes when going from 527 to 561.
-Robin
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2008-04-22 08:41:38 Re: /dev/fb0 missing
Michael Hennerich (GERMANY)
Message: 54731 Did you add the driver to your platfrom device file in arch/blackfin/mach-bf561/boards/yourboard.c ?
Have a look at arch/blackfin/mach-bf527/ezkit.c and look for CONFIG_FB_BFIN_T350MCBQ.
If you don't add it the driver won't get called .
-Michael
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2008-04-23 08:04:09 Re: /dev/fb0 missing
Harvind Singh (INDIA)
Message: 54781
Michael,
Thanks a lot,
It solved the problem.
Harvind singh
