一、Android 系統(tǒng)開機logo的修改

• 安卓系統(tǒng)的開機分為u-boot logo 和 kernel logo
• 開機logo圖片必須是 bmp 格式，并且分辨率必須為偶數(shù)
• 將制作好的BMP格式logo圖片放置Android源碼kernel目錄下，重新編譯即可

二、Android logo常見問題分析

1、RK3288 Android uboot logo顯示色差

原因:?uboot logo 圖片只能是8bpp的bmp圖（參考uboot源碼), 一般使用的都是24bpp 的jpg 和png 圖

解決:?使用圖片轉(zhuǎn)換腳本或工具轉(zhuǎn)換成8bit 256色的bmp圖即可

正確的格式 參考下圖(位深度 8bit, 格式bmp):

2、RK3288 Android uboot logo燒錄上電無法開機或黑白圖案

原因:?uboot?logo 圖片像素不支持

解決:?使用圖片轉(zhuǎn)換腳本或工具更改像素即可

3、RK3288 Android uboot logo顯示較暗

原因:?uboot logo 背光低

解決:LVDS屏 uboot-logo顯示時，拉高背光使能文章來源地址http://www.zghlxwxcb.cn/news/detail-499293.html

diff --git a/device/rockchip/common/ueventd.rockchip.rc b/device/rockchip/common/ueventd.rockchip.rc
index 9c1cd0cbfa..19ff54ef53 100644
--- a/device/rockchip/common/ueventd.rockchip.rc
+++ b/device/rockchip/common/ueventd.rockchip.rc
@@ -42,6 +42,7 @@
 /dev/timerirq             0660   system     system
 /dev/accelirq             0660   system     system
 /dev/compassirq           0660   system     system
+/dev/spi-b               0666   system     system
 
 # for GPS
 #/dev/ttyS3                0600   gps        gps
diff --git a/frameworks/base/cmds/bootanimation/BootAnimation.cpp b/frameworks/base/cmds/bootanimation/BootAnimation.cpp
index b75a338907..3f87c7b105 100755
--- a/frameworks/base/cmds/bootanimation/BootAnimation.cpp
+++ b/frameworks/base/cmds/bootanimation/BootAnimation.cpp
@@ -458,8 +458,19 @@ status_t BootAnimation::readyToRun() {
 bool BootAnimation::threadLoop()
 {
     bool r;
+    int fd = -1;
+    int arg = 1;
     // We have no bootanimation file, so we use the stock android logo
     // animation.
+
+    fd=open("/dev/spi-b",O_RDWR);              
+    if(fd < 0){                        
+       ALOGW("ybx open /dev/spi-b failed fd=%d,errno=%d",fd,errno);            
+    }          
+    if(fd >= 0){                       
+       ioctl(fd,1,&arg);                       
+       close(fd);
+    }
     if (mZip == NULL) {
         r = android();
     } else {
diff --git a/kernel/default_logo.bmp b/kernel/default_logo.bmp
index 75209a0bff..5bd7bc486f 100644
Binary files a/kernel/default_logo.bmp and b/kernel/default_logo.bmp differ
diff --git a/kernel/drivers/pwm/tlc5615.c b/kernel/drivers/pwm/tlc5615.c
index af69bad142..60bb02fc3a 100644
--- a/kernel/drivers/pwm/tlc5615.c
+++ b/kernel/drivers/pwm/tlc5615.c
@@ -41,6 +41,7 @@ dev_t devno;
 struct cdev *tlc_cdev;
 struct class *cls;
 struct device *spi_xiaohu_device;
+static int flag_open_backlight = 0;^M
 
 
 static int spi_request_gpio(void)
@@ -94,6 +95,10 @@ static void gpio_xiaohu_init(void){
   //gpio_set_value(ENBLK_S, 1);
   gpio_set_value(blk_en.gpio_num, blk_en.enable_level);
   gpio_set_value(ENBLK_T, 1);
+  gpio_set_value(MOSI, 0); ^M
+  gpio_set_value(ENBLK, 0);^M
+  gpio_set_value(ENBLK_S, 0);^M
+  gpio_set_value(ENBLK_T, 0);^M
   //gpio_set_value(VGA_RESET,1);
 }
 
@@ -162,7 +167,9 @@ void DAconvert(unsigned int value){
        ss_enable(0);
        if (value >= 10)
                isbackon = value;
-       EnBacklight(isbackon); // if value == 0 disable backlight
+^M
+       if(flag_open_backlight)^M
+               EnBacklight(isbackon); // if value == 0 disable backlight^M
  }
 
 
@@ -175,6 +182,7 @@ long spi_xiaohu_ioctl(struct file *file, unsigned cmd, unsigned long arg){
                        DAconvert(arg);
                break;
                case 1:
+                       flag_open_backlight = 1;^M
                        EnBacklight(arg);
                break;
        }

到了這里，關(guān)于RK3288 Android logo 一、Android 系統(tǒng)開機logo的修改的文章就介紹完了。如果您還想了解更多內(nèi)容，請在右上角搜索TOY模板網(wǎng)以前的文章或繼續(xù)瀏覽下面的相關(guān)文章，希望大家以后多多支持TOY模板網(wǎng)！