Advantech SG-1103 Manual de usuario descargar pdf (Pagina 42)

ROM-5420 User Manual 34

220, 40,

21, 7,

60, 10,

FB_VMODE_NONINTERLACED,

FB_MODE_IS_DETAILED,},

}

The definition of fb_videomode in linux-3.0.35/include/linux/fb.h:

The name field is optional. If you input this value, it can be used in U-Boot environ-

ment settings.

The refresh field is the screen refresh frame rate, such as 60Hz, 70Hz. The resolution

can be filled in the xres & yres fields.

The pixel clock (pixclock) is equaled to 10

/(Total horizontal line * Total vertical line *

DCLK). For example, the total horizontal line is 1344 DCLK, and total vertical number

is 806 horizontal lines. The DCLK frequency is 60 MHz. Therefore, we can get 10

(1344*806*60) = 15385.

The margin values can be seen as front porch & back porch.

The sync_len means pulse width.

The sync value indicates the sync polarity (low or high).

struct fb_videomode {

const char *name; (optional)

u32 refresh; (optional)

u32 xres;

u32 yres;

u32 pixclock;

u32 left_margin;

u32 right_margin;

u32 upper_margin;

u32 lower_margin;

u32 hsync_len;

u32 vsync_len;

u32 sync;

u32 vmode;

u32 flag;

};

3.8.5.2 Single Display Settings

HDMI out, please set in u-boot as below:

setenv bootargs_mmc 'setenv bootargs ${bootargs} root=/dev/

mmcblk1p1 rootwait rw video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24'

VGA out, please set in u-boot as below:

setenv bootargs_mmc 'setenv bootargs ${bootargs} root=/dev/

mmcblk1p1 rootwait rw video=mxcfb0:dev=lcd,1920x1080M@60,if=RGB24'

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