root@beaglebone:~# uname -r
4.2.3-bone2
root@beaglebone:~# cat /boot/uboot/uEnv.txt | grep -v ^#
systemd=quiet init=/lib/systemd/systemd
dtb=am335x-boneblack-overlay.dtb
optargs=capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN capemgr.enable_partno=BB-BONE-LCD4-01
mmcroot=UUID=b7c671c8-ad6d-419b-8d5a-1b7dd65474ff ro
mmcrootfstype=ext4 rootwait fixrtc
console=ttyO0,115200n8
kernel_file=zImage
initrd_file=initrd.img
loadaddr=0x82000000
initrd_addr=0x88080000
fdtaddr=0x88000000
initrd_high=0xffffffff
fdt_high=0xffffffff
loadkernel=load mmc ${mmcdev}:${mmcpart} ${loadaddr} ${kernel_file}
loadinitrd=load mmc ${mmcdev}:${mmcpart} ${initrd_addr} ${initrd_file}; setenv initrd_size ${filesize}
loadfdt=load mmc ${mmcdev}:${mmcpart} ${fdtaddr} /dtbs/${fdtfile}
loadfiles=run loadkernel; run loadinitrd; run loadfdt
mmcargs=setenv bootargs console=tty0 console=${console} ${optargs} ${kms_force_mode} root=${mmcroot} rootfstype=${mmcrootfstype} ${systemd}
uenvcmd=run loadfiles; run mmcargs; bootz ${loadaddr} ${initrd_addr}:${initrd_size} ${fdtaddr}

root@beaglebone:~# cat /sys/devices/platform/bone_capemgr/slots
 0: PF----  -1
 1: PF----  -1
 2: P-----  -1 4D 4.3 LCD CAPE- 4DCAPE-43T     ,00A1,4D SYSTEMS      ,BB-BONE-LCD4-01
 3: PF----  -1
root@beaglebone:~# dmesg | grep bone
[    0.000000] Linux version 4.2.3-bone2 (root@a5-imx6q-wandboard-2gb) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1 Mon Oct 5 01:36:45 UTC 2015
[    3.058303] usb usb1: Manufacturer: Linux 4.2.3-bone2 musb-hcd
[    3.259420] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,00C0,5014BBBK17B8'
[    3.259447] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4
[    3.314277] bone_capemgr bone_capemgr: slot #0: No cape found
[    3.374260] bone_capemgr bone_capemgr: slot #1: No cape found
[    3.404007] bone_capemgr bone_capemgr: slot #2: '4D 4.3 LCD CAPE- 4DCAPE-43T     ,00A1,4D SYSTEMS      ,BB-BONE-LCD4-01'
[    3.444261] bone_capemgr bone_capemgr: slot #3: No cape found
[    3.450180] bone_capemgr bone_capemgr: initialized OK.
[    4.454412] bone_capemgr bone_capemgr: loader: failed to load slot-2 BB-BONE-LCD4-01:00A1 (prio 0)