Re: [lcd4linux] LCD device on peripheral bus

[Martin H. <ma...@he...>]

ant...@ti... wrote:
> Hi all,
> I have developed board based on XScale IXP425 processor running 
> Linux kernel 2.4.20 (from Montavista).
> My board have a HD44780 
> compatible 2x16 backlight display, that is connected to the board on 
> peripheral bus (chip select 3). This provides interface to a HD44780 
> compatible device by means of single 10-bit register, and I write a 
> simple driver for a memory-mapped display.
> All work fine.
> 
> Now I want 
> to use lcd4linux in my system.
> I see that HD44780 is supported by 
> lcd4linux, but the device must be connected to parport
> or i2c bus.
> 
> Any 
> suggestion about how can I port lcd4linux on my system ?
Just as a followup on Luis' email (he provided all the right pointers) -
have a look at common.c in the driver he mentioned, especially the
net4xxx_gpio_ioctl function, and there the stuff that follows the comment
"This is _not_ "generic" at all, but very much hard-wired towards being
able to use an HD44780 LCD on the GPIO pins (in 4-bit mode) and being
able to do so using generic ppdev instructions"
and adjust accordingly.

I hope that helps.

Martin

-- 
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