Re: Seg fault on any FB write (Epson S1D13A04 on Coldfire running 2.6.25)

[Kristoffer Ericson <kristoffer.ericson@gmail.com>]

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On Mon, 10 Nov 2008 20:54:11 -0500
James Kimble <jkimble@one.net> wrote:

> 
> I've been working on porting the s1d13xxxfb driver from the latest 
> kernel from Freescale for Coldfire to work with the S1D13A04 chip. I was 
> able to get things working to the point that I do get a little TUX logo 
> up on the screen at boot up. Seemed like a good start but none of my 
> user space applications will work. I can open the /dev/fb0 device and 
> the data in the info structure is correct but if I try to write to any 
> register or area in the frame buffer (or write to the device at all) I 
> get a seg fault.

Please drop me a mail with patch attached and I'll look at it,
you must have hit something nasty.

> 
> I had an earlier driver working with the 2.6.10 kernel with the same 
> hardware. The same application space program should work ( I would 
> think...) but I get the seg fault on the first write to fb0. I tried a 
> different memory location (ox4400 0000 to 0x7400 0000) for the CS 
> associated with the video  chip, no  difference. Permissions for 
> /dev/fb0 are "rw". No other process using fb0. This is really weird.
> 
> Any help or suggestions MUCH appreciated.
> 
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-- 
Kristoffer Ericson <kristoffer.ericson@gmail.com>

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