iMX6从uboot到linux启动完成一直保持LOGO不变

/************************************************************************* * * Support UBoot logo keep for Linux L3.0.35_4.1.0-GA BSP. * * Freescale semiconductor * * Author: Li Qiang, b19715@freescale.com * * Date: 11/22/2013 *************************************************************************/ 1. Description 1) Support HDMI, LVDS and LCD output in UBoot. 2) Support UBoot logo keep from uboot to Linux rootfs. 3) For HDMI, both 720P and 1080P mode were supported. 4) For LVDS, 1024x768 and 1080P dual channel panels were supported. 5) The logo file can be a 32/24/16 bpp bmp file. 2. File List -- linux-3.0.35\0001-Keep-uboot-logo-for-Linux-boot-supports-HDMI-LCD-and.patch Kernel patch to support the logo keep feature. -- u-boot-2009.08\0001-Enable-uboot-logo-for-HDMI-LCD-and-LVDS.patch Uboot patch to support the logo display. -- logo_1920x1080_32bpp.bmp Example 32bpp 1920x1080 logo file. -- logo_1024x768_24bpp.bmp Example 24bpp 1024x768 logo file. -- logo_800x480_24bpp.bmp Example 24bpp 800x480 logo file. -- readme.txt this file, please refer to it before use the patches 3. Requirement - iMX6 SabreSD board. - Linux L3.0.35_4.1.0-GA BSP. 4. How to use -- Copy the two patch files to Linux kernel and uboot folder and apply them. $ cd ~/ltib $ ./ltib -p u-boot -m prep $ ./ltib -p kernel -m prep $ cd ~/ltib/rpm/BUILD/linux-3.0.35/ $ git apply ./0001-Keep-uboot-logo-for-Linux-boot-supports-HDMI-LCD-and.patch $ cd ~/ltib/rpm/BUILD/u-boot-2009.08/ $ git apply ./0001-Enable-uboot-logo-for-HDMI-LCD-and-LVDS.patch -- Build the new uboot image: $ cd ~/ltib/rpm/BUILD/u-boot-2009.08/ $ export CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi- $ export ARCH=arm $ make mx6q_sabresd_config $ make -- Before build new UBoot image, the display type can be selected from file u-boot-2009.08\include\configs\mx6q_sabresd.h // Select one of the output mode #define IPU_OUTPUT_MODE_HDMI //#define IPU_OUTPUT_MODE_LVDS //#define IPU_OUTPUT_MODE_LCD -- Build the new kernel image: $ cd ~/ltib/rpm/BUILD/linux-3.0.35/ $ export CROSS_COMPILE=/opt/freescale/usr/local/gcc-4.6.2-glibc-2.13-linaro-multilib-2011.12/fsl-linaro-toolchain/bin/arm-fsl-linux-gnueabi- $ export ARCH=arm $ make imx6_defconfig $ make uImage -- Before "make uImage", make menuconfig can be used to select the display type. System Type ---> Freescale MXC Implementations ---> MX6 clk setting for smooth UI transtion from bootloader to kernel ---> Select Display Interface ( ) Smooth UI transtion on LCD, IPU1, DI0 ( ) Smooth UI transtion on LVDS, IPU1, DI1 (X) Smooth UI transtion on HDMI, IPU2, DI0 -- Uboot parameters for video mode 1080P HDMI: "video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 fb0base=0x27b00000 fbmem=28M hdmi_audio_clk=148500000" 720P HDMI: "video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24,bpp=32 fb0base=0x27b00000 fbmem=28M hdmi_audio_clk=74250000" 1024x768 LVDS: "video=mxcfb0:dev=ldb,LDB-XGA,if=RGB666,bpp=24 fb0base=0x27b00000 fbmem=28M" 800x480 LCD: "video=mxcfb0:dev=lcd,CLAA-WVGA,if=RGB565,bpp=24 fb0base=0x27b00000 fbmem=28M" -- dd the logo bmp file to SD card address 0x600000 and skip the 54 bytes bmp file header. 1080P HDMI: sudo dd if=logo_1920x1080_32bpp.bmp of=/dev/sdc bs=1 seek=6291456 skip=54 1024x768 LVDS: sudo dd if=logo_1024x768_24bpp.bmp of=/dev/sdc bs=1 seek=6291456 skip=54 800x480 LCD: sudo dd if=logo_800x480_24bpp.bmp of=/dev/sdc bs=1 seek=6291456 skip=54 5. Note 1) The logo.bmp file can be 32bpp, 24bpp or 16bpp, and it should be synced with video mode parameters "bpp=xx" and uboot config file mx6q_sabresd.h (#define DISPLAY_BPP xx). 2) The IPU number and DI number are hard coded in kernel file "board-mx6q_sabresd.c". static struct fsl_mxc_hdmi_core_platform_data hdmi_core_data = { .ipu_id = 1, .disp_id = 0, }; static struct fsl_mxc_lcd_platform_data lcdif_data = { .ipu_id = 0, .disp_id = 0, .default_ifmt = IPU_PIX_FMT_RGB565, }; static struct fsl_mxc_ldb_platform_data ldb_data = { .ipu_id = 0, .disp_id = 1, .ext_ref = 1, .mode = LDB_SEP1, .sec_ipu_id = 0, .sec_disp_id = 0, }; 3) The IPU number and DI number are defined by Macro in Uboot file "include\configs\mx6q_sabresd.h" #define IPU_NUM 2 // 1 for IPU1, 2 for IPU2. #define DI_NUM 0 // 0 for DI0, 1 for DI1. 4) The display type used in uboot and kernel must be same, same type, same IPU number, same DI port and same resolution.