LCD Driver Transplantation on 2440

In this article, I will introduce and summarize every step of learning embedded Linux. I would like to sum up my experience, and I hope it will be convenient for anyone who wants to get started with embedded Linux. If any error occurs, please correct it.

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I. Porting Environment

• MASTER: VMWare -- fedora 9

• Development Board: mini2440 -- 64 MB Nand
• Compiler: arm-linux-gcc-4.3.2

2. Migration steps

1. Modify the kernel source code. 2.6.30.4 kernel supports LCD very well. Only a few modifications are made here.

#gedit arch/arm/mach-s3c2440/mach-smdk2440.c

Modify the smdk2440_ LCD _cfg function and the smdk2440_fb_info function to set the LCD parameters. My name is nec3.5 inch tftscreen. As follows:

Enable the backlight of the LCD. If the backlight is not enabled, you cannot observe whether the LCD works normally. From the schematic diagram of the Development Board, we can see that the LCD backlight power LCD _pwr is connected to the gpg4 pin of the S3C2440, and the following modifications are made:

2. Configure kernel options. Choose LCD support and logo icons

Device Drivers --->     Graphics support --->         < > Lowlevel video output switch controls         <*> Support for frame buffer devices --->             --- Support for frame buffer devices             [*] Enable firmware EDID             [ ] Framebuffer foreign endianness support --->             [*] Enable Video Mode Handling Helpers             [ ] Enable Tile Blitting Support             *** Frame buffer hardware drivers ***             < > Epson S1D13XXX framebuffer support             <*> S3C2410 LCD framebuffer support             [ ] S3C2410 lcd debug messages             < > Silicon Motion SM501 framebuffer support             < > Virtual Frame Buffer support (ONLY FOR TESTING!)             < > E-Ink Metronome/8track controller support             < > Fujitsu MB862xx GDC support             < > E-Ink Broadsheet/Epson S1D13521 controller support         [*] Backlight & LCD device support --->             Display device support --->             Console display driver support --->         [*] Bootup logo --->             --- Bootup logo             [ ] Standard black and white Linux logo             [ ] Standard 16-color Linux logo             [*] Standard 224-color Linux logo (NEW)

3. recompile the kernel and download it to the Development Board. After the power-on system is started, you can see that the LCD is on and the penguin icon appears.