beaglebone black开机禁止加载HDMI cape

来源：互联网发布：tomcat修改端口不生效编辑：程序博客网时间：2024/05/22 07:56

标题：beaglebone black开机禁止加载HDMI cape

一般情况下，beaglebone black自带系统Angstrom默认启动两个cape:
1、BB-BONE-EMMC-2G
2、BB-BONELT-HDMI

我们可以通过编辑uEnv.txt的文件来决定是否启动HDMI，步骤如下
1、加载启动分区：

mkdir /mnt/sdcard mount /dev/mmcblk0p1  /mnt/card

2、编辑uEnv.txt

vim /mnt/card/uEnv.txt

文件内容如下

##These are needed to be compliant with Angstrom's 2013.06.20 u-boot. loadaddr=0x82000000 fdtaddr=0x88000000 rdaddr=0x88080000  initrd_high=0xffffffff fdt_high=0xffffffff  ##These are needed to be compliant with Debian 2014-05-14 u-boot.  loadximage=load mmc 0:2 ${loadaddr} /boot/vmlinuz-${uname_r} loadxfdt=load mmc 0:2 ${fdtaddr} /boot/dtbs/${uname_r}/${fdtfile} loadxrd=load mmc 0:2 ${rdaddr} /boot/initrd.img-${uname_r}; setenv rdsize ${filesize} loaduEnvtxt=load mmc 0:2 ${loadaddr} /boot/uEnv.txt ; env import -t ${loadaddr} ${filesize}; check_dtb=if test -n ${dtb}; then setenv fdtfile ${dtb};fi; loadall=run loaduEnvtxt; run check_dtb; run loadximage; run loadxrd; run loadxfdt;  mmcargs=setenv bootargs console=tty0 console=${console} ${optargs} ${cape_disable} ${cape_enable} root=/dev/ mmcblk0p2 rootfstype=${mmcrootfstype} ${cmdline}  uenvcmd=run loadall; run mmcargs; bootz ${loadaddr} ${rdaddr}:${rdsize} ${fdtaddr};

在”mmcargs=setenv…”一行插入以下语句

optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN

保存，退出

3、重启

shutdown -r now

4、开机查看slots已经变成了这样：

root@beaglebone:~# cat $SLOTS   0: 54:PF---   1: 55:PF---   2: 56:PF---   3: 57:PF---   4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G  5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI  6: ff:P-O-- Bone-Black-HDMIN,00A0,Texas Instrument,BB-BONELT-HDMIN  7: ff:P-O-L Override Board Name,00A0,Override Manuf,bone_pwm_P8_45  8: ff:P-O-L Override Board Name,00A0,Override Manuf,bone_pwm_P8_46 root@beaglebone:~#

我的SLOTS为

root@beaglebone:~# echo $SLOTS  /sys/devices/bone_capemgr.9/slots

5、结束

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