dd if dev urandom of dev fb1 bs 480000 count records in records out n5

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# dd if=/dev/urandom of=/dev/fb1 bs=480000 count=1
1+0 records in
1+0 records out
# n516_handle_irq: Metronome IRQ! RDY=1
<7>Registering platform device 'jz-lcd.0'. Parent at platform
<7>device: 'jz-lcd.0': device_add
<7>bus: 'platform': add device jz-lcd.0
<7>driver_probe_device: drv: jz-lcd
<7>++++ 1
<7>bus: 'platform': driver_probe_device: matched device jz-lcd.0 with driver jz-lcd
<7>bus: 'platform': really_probe: probing driver jz-lcd with device jz-lcd.0
<4>fb_alloc_cmap,fb.cmap.len:256....
<4>jzlcd use 1 framebuffer:
<4>jzlcd fb[0] phys addr =0x03a00000
<4>jzfb_set_var: after fb_set_cmap...
<4>h = 656, vsw = 22, bfw = 2151809024, efw = 0
<4>LCDC: PixClock:16000000 LcdClock:42000000
<4>InFiFo0 underrun
<4>Out FiFo underrun.
<7>device: 'fb0': device_add
<7> : ENTER n516_fb_notifier_callback
<7> : ENTER n516_share_video_mem
<4>fb0: jz-lcd frame buffer device, using 1024K of video memory
<4>REG_LCD_CFG: 0x00f00000
<4>REG_LCD_VSYNC: 0x00000013
<4>REG_LCD_HSYNC: 0x0000001f
<4>REG_LCD_VAT: 0x01d302a6
<4>REG_LCD_DAH: 0x002401b4
<4>REG_LCD_DAV: 0x001402a4
<4>REG_LCD_PS: 0x00000000
<4>REG_LCD_CLS: 0x00000000
<4>REG_LCD_SPL: 0x00000000
<4>REG_LCD_REV: 0x00000000
<4>REG_LCD_CTRL: 0x2400080c
<4>REG_LCD_STATE: 0x000000b0
<4>REG_LCD_IID: 0x00000000
<4>REG_LCD_DA0: 0x03867400
<4>REG_LCD_SA0: 0x03a00000
<4>REG_LCD_FID0: 0xbeafbeaf
<4>REG_LCD_CMD0: 0xc0013070
<4>==================================
<4>REG_LCD_VSYNC: 0:19
<4>REG_LCD_HSYNC: 0:31
<4>REG_LCD_VAT: 467:678
<4>REG_LCD_DAH: 36:436
<4>REG_LCD_DAV: 20:676
<4>==================================
<7>driver: 'jz-lcd.0': driver_bound: bound to device 'jz-lcd'
<7>bus: 'platform': really_probe: bound device jz-lcd.0 to driver jz-lcd
<7>Registering platform device 'metronomefb'. Parent at platform
<7>device: 'metronomefb': device_add
<7>bus: 'platform': add device metronomefb
<7>driver_probe_device: drv: jz-lcd
<7>++++ 1
<7>driver_probe_device: drv: serial8250
<7>++++ 1
<7>driver_probe_device: drv: jz4740_udc
<7>++++ 1
<7>bus: 'platform': add driver metronomefb
<7>driver_probe_device: drv: metronomefb
<7>++++ 1
<7>bus: 'platform': driver_probe_device: matched device metronomefb with driver metronomefb
<7>bus: 'platform': really_probe: probing driver metronomefb with device metronomefb
<6>metronomefb metronomefb: firmware: requesting metronome.wbf
<7>device: 'metronomefb': device_add
<4>irq 79, desc: 803d8c6c, depth: 1, count: 0, unhandled: 0
<4>->handle_irq(): 80082340, handle_bad_irq+0x0/0x2b4
<4>->chip(): 803d3cf0, gpio_irq_type+0x0/0x40
<4>->action(): 00000000
<4> IRQ_DISABLED set
<4> IRQ_NOPROBE set
<4>unexpected IRQ # 79
<7>device: 'metronomefb': device_unregister
<7>metronomefb metronomefb: ENTER n516_setup_irq
<7>metronome_powerup_cmd: ENTER<7>metronomefb metronomefb: ENTER n516_set_rst, RDY=0
<7>metronomefb metronomefb: ENTER n516_set_stdby, RDY=0
<7>metronomefb metronomefb: ENTER n516_wait_event, RDY=0