Kernel启动阶段添加显示动画

准备文件：启动动画的连续图片

如果是png格式，使用

pngtopnm logo.png > logo.pnm 转化为pnm

（没有pngtopnm /bmptopnm 命令，使用sudo apt-get install pnmtoplainpm命令安装）

如果是bmp格式，使用

bmptopnm logo.bmp > logo.pnm 转化为pnm

然后使用

pnmquant 224 logo.pnm > logo224.pnm

pnmtoplainpnm logo224.pnm > logo_linux_clut224.ppm

将图片转化为ppm格式

将图片拷贝到OK3568-linux-source/kernel/drivers/video/logo下

重命名为_clut224.ppm结尾，方便Makefile识别

修改Makefile

修改logo.c

修改OK3568-linux-source/kernel/include/linux/linux_logo.h

修改OK3568-linux-source/arch/arm64/configs/OK3568-C-linux_defconfig将kernel logo打开

diff --git a/arch/arm64/configs/OK3568-C-linux_defconfig b/arch/arm64/configs/OK3568-C-linux_defconfig

index 97d46ceff..d5af9f21d 100644

--- a/arch/arm64/configs/OK3568-C-linux_defconfig

+++ b/arch/arm64/configs/OK3568-C-linux_defconfig

@@ -590,3 +590,45 @@ CONFIG_RCU_CPU_STALL_TIMEOUT=60

 CONFIG_FUNCTION_TRACER=y

 CONFIG_BLK_DEV_IO_TRACE=y

 CONFIG_LKDTM=y

+

+#

+# Console display driver support

+#

+CONFIG_FONT_8x8=n

+CONFIG_VGA_CONSOLE=y

+CONFIG_DUMMY_CONSOLE=y

+CONFIG_DUMMY_CONSOLE_COLUMNS=80

+CONFIG_DUMMY_CONSOLE_ROWS=25

+CONFIG_FRAMEBUFFER_CONSOLE=y

+CONFIG_FRAMEBUFFER_CONSOLE_DETECT_PRIMARY=y

+# CONFIG_FRAMEBUFFER_CONSOLE_ROTATION is not set

+# CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER is not set

+CONFIG_LOGO=y

+CONFIG_LOGO_LINUX_MONO=n

+CONFIG_LOGO_LINUX_VGA16=n

+CONFIG_LOGO_LINUX_CLUT224=y

+CONFIG_SOUND=y

+CONFIG_SND=y

+CONFIG_SND_TIMER=y

+CONFIG_SND_PCM=y

+CONFIG_SND_PCM_ELD=y

+CONFIG_SND_PCM_IEC958=y

+CONFIG_SND_SEQ_DEVICE=y

+CONFIG_SND_COMPRESS_OFFLOAD=y

+CONFIG_SND_JACK=y

+CONFIG_SND_JACK_INPUT_DEV=y

+# CONFIG_SND_OSSEMUL is not set

+CONFIG_SND_PCM_TIMER=y

+CONFIG_SND_HRTIMER=y

+CONFIG_SND_DYNAMIC_MINORS=y

+CONFIG_SND_MAX_CARDS=32

+# CONFIG_SND_SUPPORT_OLD_API is not set

+CONFIG_SND_PROC_FS=y

+CONFIG_SND_VERBOSE_PROCFS=y

+# CONFIG_SND_VERBOSE_PRINTK is not set

+# CONFIG_SND_DEBUG is not set

+CONFIG_SND_DMA_SGBUF=y

+CONFIG_SND_SEQUENCER=y

+CONFIG_SND_SEQ_DUMMY=y

+CONFIG_SND_SEQ_HRTIMER_DEFAULT=y

+CONFIG_SND_DRIVERS=y

修改OK3568-linux-source/kernel/drivers/video/fbdev/core/fbcon.c

OK3568-linux-source/kernel/drivers/video/fbdev/core/fbmem.c

调整logo显示位置居中和连续显示

diff --git a/drivers/video/fbdev/core/fbcon.c b/drivers/video/fbdev/core/fbcon.c

index bf7959fdf..2607ac9cb 100644

--- a/drivers/video/fbdev/core/fbcon.c

+++ b/drivers/video/fbdev/core/fbcon.c

@@ -569,6 +569,7 @@ static void fbcon_prepare_logo(struct vc_data *vc, struct fb_info *info,

        if (fb_get_color_depth(&info->var, &info->fix) == 1)

                erase &= ~0x400;

        logo_height = fb_prepare_logo(info, ops->rotate);

+       logo_height += (info->var.yres / 2) - (logo_height / 2);

        logo_lines = DIV_ROUND_UP(logo_height, vc->vc_font.height);

        q = (unsigned short *) (vc->vc_origin +

                                vc->vc_size_row * rows);

@@ -2037,6 +2038,8 @@ static int fbcon_resize(struct vc_data *vc, unsigned int width,

        return 0;

 }

+extern int fb_get_logo(struct fb_info *info, int rotate);

+

 static int fbcon_switch(struct vc_data *vc)

 {

        struct fb_info *info, *old_info = NULL;

@@ -2158,7 +2161,14 @@ static int fbcon_switch(struct vc_data *vc)

                logo_shown = fg_console;

                /* This is protected above by initmem_freed */

-               fb_show_logo(info, ops->rotate);

+               //fb_show_logo(info, ops->rotate);

+#if 1

+               for(i = 0; i < 25; i++){

+                       fb_get_logo(info, i);

+                       fb_show_logo(info, ops->rotate);

+                       msleep(50);// 睡眠 50 ms 作为显示图片的切换间隔

+               }

+#endif

                update_region(vc,

                              vc->vc_origin + vc->vc_size_row * vc->vc_top,

                              vc->vc_size_row * (vc->vc_bottom -

diff --git a/drivers/video/fbdev/core/fbmem.c b/drivers/video/fbdev/core/fbmem.c

index 7a70e7b80..63cfad4c0 100644

--- a/drivers/video/fbdev/core/fbmem.c

+++ b/drivers/video/fbdev/core/fbmem.c

@@ -509,10 +509,10 @@ static int fb_show_logo_line(struct fb_info *info, int rotate,

                fb_set_logo(info, logo, logo_new, fb_logo.depth);

        }

-       image.dx = 0;

-       image.dy = y;

        image.width = logo->width;

        image.height = logo->height;

+       image.dx = (info->var.xres / 2) - (logo->width / 2);

+       image.dy = (info->var.yres / 2) - (logo->height / 2);

        if (rotate) {

                logo_rotate = kmalloc_array(logo->width, logo->height,

@@ -681,12 +681,25 @@ int fb_show_logo(struct fb_info *info, int rotate)

        return y;

 }

+

+int fb_get_logo(struct fb_info *info, int num)

+{

+       int depth = fb_get_color_depth(&info->var, &info->fix);

+       depth |= num << 16;

+       fb_logo.logo = fb_find_logo(depth);

+       if(!fb_logo.logo) {

+               return -1;

+       }

+       return 0;

+}

 #else

 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; }

 int fb_show_logo(struct fb_info *info, int rotate) { return 0; }

+int fb_get_logo(struct fb_info *info, int rotate) { return 0; }

 #endif /* CONFIG_LOGO */

 EXPORT_SYMBOL(fb_prepare_logo);

 EXPORT_SYMBOL(fb_show_logo);

+EXPORT_SYMBOL(fb_get_logo);

 static void *fb_seq_start(struct seq_file *m, loff_t *pos)

 {

此时开机会发现显示logo时屏幕有一个闪烁的光标，修改OK3568-linux-source/kernel/drivers/video/fbdev/core/bitblit.c去掉光标

iff --git a/drivers/video/fbdev/core/bitblit.c b/drivers/video/fbdev/core/bitblit.c

index 436365efa..e8e874653 100644

--- a/drivers/video/fbdev/core/bitblit.c

+++ b/drivers/video/fbdev/core/bitblit.c

@@ -373,7 +373,8 @@ static void bit_cursor(struct vc_data *vc, struct fb_info *info, int mode,

        if (info->fbops->fb_cursor)

                err = info->fbops->fb_cursor(info, &cursor);

-       if (err)

+       //if (err)

+       if (0)

                soft_cursor(info, &cursor);

        ops->cursor_reset = 0;

此时开机可以看到动画在屏幕中间正常播放

本文参考https://blog.csdn.net/qq_37596943/article/details/127976078如有侵权，请联系删除