Beaglebone Black 最小Linux从零系统编译

最近再研究beaglebone black，下面记录了从uboot，kernel，busybox编译过程。

要板子上跑linux系统起来，必须需要以下3份源码uboot,kernel,busybox.

Uboot

uboot源码下载地址

 1.切换到 v2021.04-bbb.io-am335x-am57xx   分支

 2.输入以下指令，把bbb配置文件导入到 .config

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- am335x_evm_defconfig

 3.编译，得到uboot.bin文件,该文件是最终uboot编译出来文件

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j8

Kernel

Linux源码下载地址

1.切换到4.14分支

2.拷贝bbb配置文件到.config

cp arch/arm/configs/bb.org_defconfig .config

 3.输入以下指令，进入menuconfig 配置界面，

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig

1.

• Device Drivers->Block device->选择RAM block device support (即选择Y，用于支持ramfs）

• File systems->选择Network File Systems (即选择Y）

注意，内核对ramfs大小有限制，默认为16M,自行修改 Default RAM disk size大小。

2.编译内核,在arch/arm/boot/dts找到设备树am335x-boneblack.dtb，在arch/arm/boot找到zImage内核映像。

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- zImage dtbs -j8

busybox编译

busybox下载地址

1.我是下载目前最新BusyBox 1.33.1.版本，源码下载后，输入以下命令

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- menuconfig

.在Build Options中 选择Build static binary以静态的方式编译， 将Cross compiler prefix设置为arm-linux-gnueabihf-

 2.输入以下命令进行编译

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j8

3.编译成功后输入以下指令，会把编译结果放到 _install文件夹中,安装完成后，在指定的安装目录下可以看到bin、sbin、usr。

make install

4.然后在_install目录下，配置文件系统，在安装根目录下创建etc目录，在etc下创建以下3个文件：

1.  
   mkdir etc
2.  
   cd etc
3.  
   vim inittab
4.  
   vim rc
5.  
   vim motd

文件具体内容如下：

inittab：

1.  
   # /etc/inittab
2.  
   ::sysinit:/etc/init.d/rcS
3.  
   ::askfirst:-/bin/sh
4.  
   ::once:/usr/sbin/telnetd -l /bin/login
5.  
   ::ctrlaltdel:/sbin/reboot
6.  
   ::shutdown:/bin/umount -a -r

rc:(此文件要求可执行属性，使用chmod x rc修改属性)

1.  
   #!/bin/sh
2.  
   hostname BeagleBone
3.  
   mount -t proc proc /proc
4.  
   /bin/cat /etc/motd

可以看到这个脚本文件执行的命令有两条：

1. 将hostname设置为BeagleBone

2. 挂载proc伪文件系统

motd：

1.  
   Welcome to
2.  
   ===============================
3.  
   ARM-LINUX WORLD
4.  
   BB -- BLACK
5.  
   ===============================

该文件用于终端启动打印内容，这里可以任意修改，这里给安利一个字符图标网址 字符图标网址

在etc下创建init.d目录，并将/etc/rc向etc/init.d/rcS做符号链接，这是inittab指定的启动脚本

1.  
   $ mkdir init.d
2.  
   $ cd init.d
3.  
   $ ln -s ../rc rcS

创建dev,proc,sys空目录

1.  
   mkdir dev
2.  
   mkdir proc
3.  
   mkdir sys

创建lib目录，把交叉编译工具链lib/ld-2.31.so,libc-2.31.so,libm-2.31.so三个拷贝到_install/lib目录下.

注意，我的交叉编译工具链版本是9.3,这三个文件每个版本名字不一样，读者需要自己区分。别盲目粘贴复制我的命令。

1.  
   $ mkdir lib
2.  
   $ cd /usr/arm-linux-gnueabihf/lib
3.  
   $cp ld-2.31.so ~/BusyBox/system/lib
4.  
   $cp libc-2.31.so ~/BusyBox/system/lib
5.  
   $cp libm-2.31.so ~/BusyBox/system/lib

做相应的符号链接：

1.  
   $ ln -s ld -2.31.so ld-linux-armhf.so.3
2.  
   $ ln -s libc -2.31.so libc.so.6
3.  
   $ ln -s libm -2.31.so libm.so.6

好了，到此为止，我们配置完busybox文件夹，这是基本rootfs，来张全家福。

 RAMDISK文件映像制作

1.先创建一个空的、Ext2FS的文件系统映像，作为RAM Disk

$ dd if=/dev/zero of=ramdisk_img bs=1k count=8192

这个最大容量约为8MB。对其格式化成Ext2FS文件系统

mke2fs ramdisk_img

这样得到的ramdisk_img可以像普通的文件系统一样进行挂载和卸载，挂载之后可以进行文件复制等操作

sudo mount -o loop ramdisk_img /home/yates/beagleboard/busybox_file/nfs

注意，以上命令具体挂载路径要自己配置真正电脑路径，伸手党要注意。

2.在rootfs /dev目录下创建设备文件

1.  
   $ cd dev
2.  
   $ mknod console c 5 1
3.  
   $ mknod null c 1 3
4.  
   $ mknod zero c 1 5

以上对于RAM Disk内容的处理已经完成。接下来只需要压缩, 得到ramdisk_img.gz文件。

1.  
   $ umount /home/yates/beagleboard/busybox_file/nfs
2.  
   $ gzip ramdisk_img

到此为止，我们需要文件都准备好了，uboot.img,zImage,am335x-boneblack.dtb,ramdisk_img.gz,MLO把这四个文件准备好放在tftp server文件夹。

关于tftp服务器配置，请参考以下教程

ubuntu tftp教程

系统烧录

我们准备好以上文件，下面我们要把上面4个文件烧录到板子上面测试。

1.把uboot.img,zImage,am335x-boneblack.dtb,ramdisk_img.gz,MLO放到tftp文件夹下。

2.sd卡格式化

2.1 首先把sd卡插入电脑，查看sd卡盘符，我的电脑插入sd卡盘符是/dev/sdb

2.2输入以下命令，即可打开软件配置

sudo fdisk /dev/sdb

1.  
   yates@yates-virtual-machine:/usr/arm-linux-gnueabihf/lib$ sudo fdisk /dev/sdb
2.  
    
3.  
   Welcome to fdisk (util-linux 2.34).
4.  
   Changes will remain in memory only, until you decide to write them.
5.  
   Be careful before using the write command.
6.  
    
7.  
    
8.  
   Command (m for help): d
9.  
   Selected partition 1
10.  
    Partition 1 has been deleted.
11.  
     
12.  
    Command (m for help): p
13.  
    Disk /dev/sdb: 14.66 GiB, 15720251392 bytes, 30703616 sectors
14.  
    Disk model: Mass-Storage
15.  
    Units: sectors of 1 * 512 = 512 bytes
16.  
    Sector size (logical/physical): 512 bytes / 512 bytes
17.  
    I/O size (minimum/optimal): 512 bytes / 512 bytes
18.  
    Disklabel type: dos
19.  
    Disk identifier: 0x3244345d
20.  
     
21.  
    Command (m for help): n
22.  
    Partition type
23.  
    p primary (0 primary, 0 extended, 4 free)
24.  
    e extended (container for logical partitions)
25.  
    Select (default p): p
26.  
    Partition number (1-4, default 1): 800000
27.  
    Value out of range.
28.  
    Partition number (1-4, default 1):
29.  
    First sector (2048-30703615, default 2048):
30.  
    Last sector, /-sectors or /-size{K,M,G,T,P} (2048-30703615, default 30703615): 800000
31.  
     
32.  
    Created a new partition 1 of type 'Linux' and of size 389.6 MiB.
33.  
     
34.  
    Command (m for help): t
35.  
    Selected partition 1
36.  
    Hex code (type L to list all codes): c
37.  
    Changed type of partition 'Linux' to 'W95 FAT32 (LBA)'.
38.  
     
39.  
    Command (m for help): a
40.  
    Selected partition 1
41.  
    The bootable flag on partition 1 is enabled now.
42.  
     
43.  
    Command (m for help): p
44.  
    Disk /dev/sdb: 14.66 GiB, 15720251392 bytes, 30703616 sectors
45.  
    Disk model: Mass-Storage
46.  
    Units: sectors of 1 * 512 = 512 bytes
47.  
    Sector size (logical/physical): 512 bytes / 512 bytes
48.  
    I/O size (minimum/optimal): 512 bytes / 512 bytes
49.  
    Disklabel type: dos
50.  
    Disk identifier: 0x3244345d
51.  
     
52.  
    Device Boot Start End Sectors Size Id Type
53.  
    /dev/sdb1 * 2048 800000 797953 389.6M c W95 FAT32 (LBA)
54.  
     
55.  
    Command (m for help): n
56.  
    Partition type
57.  
    p primary (1 primary, 0 extended, 3 free)
58.  
    e extended (container for logical partitions)
59.  
    Select (default p): p
60.  
    Partition number (2-4, default 2):
61.  
    First sector (800001-30703615, default 800768):
62.  
    Last sector, /-sectors or /-size{K,M,G,T,P} (800768-30703615, default 30703615):
63.  
     
64.  
    Created a new partition 2 of type 'Linux' and of size 14.3 GiB.
65.  
     
66.  
    Command (m for help): p
67.  
    Disk /dev/sdb: 14.66 GiB, 15720251392 bytes, 30703616 sectors
68.  
    Disk model: Mass-Storage
69.  
    Units: sectors of 1 * 512 = 512 bytes
70.  
    Sector size (logical/physical): 512 bytes / 512 bytes
71.  
    I/O size (minimum/optimal): 512 bytes / 512 bytes
72.  
    Disklabel type: dos
73.  
    Disk identifier: 0x3244345d
74.  
     
75.  
    Device Boot Start End Sectors Size Id Type
76.  
    /dev/sdb1 * 2048 800000 797953 389.6M c W95 FAT32 (LBA)
77.  
    /dev/sdb2 800768 30703615 29902848 14.3G 83 Linux
78.  
     
79.  
    Command (m for help): w
80.  
    The partition table has been altered.
81.  
    Failed to remove partition 1 from system: Device or resource busy
82.  
    Failed to add partition 1 to system: Device or resource busy
83.  
    Failed to add partition 2 to system: Device or resource busy
84.  
     
85.  
    The kernel still uses the old partitions. The new table will be used at the next reboot.
86.  
    Syncing disks.
87.  
     
88.  
    yates@yates-virtual-machine:/usr/arm-linux-gnueabihf/lib$ sudo fdisk /dev/sdb
89.  
     
90.  
    Welcome to fdisk (util-linux 2.34).
91.  
    Changes will remain in memory only, until you decide to write them.
92.  
    Be careful before using the write command.
93.  
     

注意以下命令

d:是删除分区

n:是创建逻辑分区

t:是创建磁盘格式，c是W95 FAT32 (LBA)格式

p:打印磁盘信息

a:设置默认启动

w:是写入磁盘

在这里我们创建两个分区，一个是FAT32格式，另外一个是ext2

3.把u-boot.img,MLO文件放到sd卡，另外创建一个uEnv.txt文本，里面填入以下信息

1.  
   console=ttyO0,115200n8
2.  
   ipaddr=192.168.0.58
3.  
   serverip=192.168.0.96
4.  
   rootpath=/exports/rootfs
5.  
   netargs=setenv bootargs console=${console} ${optargs} root=/dev/nfs nfsroot=${serverip}:${rootpath},${nfsopts} rw ip=${ipaddr}:${serverip}:192.168.23.1:255.255.255.0:beaglebone:eth0:none:192.168.23.1
6.  
   netboot=echo Booting from network ...; tftp ${loadaddr} ${bootfile}; tftp ${fdtaddr} ${fdtfile}; run netargs; bootz ${loadaddr} - ${fdtaddr}
7.  
   uenvcmd=run netboot

4.把sd卡插入到板子上，插上网线，上电按住boot键，同时用空格键打断uboot倒数

5.输入以下信息配置网口ip核tftp server ip

1.  
   setenv ipaddr 192.168.0.111
2.  
   setenv serverip 192.168.0.96
3.  
   setenv netmask 255.255.255.0

6.输入以下信息读取zImage,ramdisk_img.gz,am335x-boneblack.dtb

1.  
   tftp 0x82000000 zImage
2.  
   tftp 0x88080000 ramdisk_img.gz
3.  
   tftp 0x88000000 am335x-boneblack.dtb

注意：am335x外设内存起始地址为0x88000000。

第一条命令用于tftp读取zImage,

第二条信息用于读取文件系统

第三条命令用于读取设备树

7.输入以下信息用于引导系统起来

1.  
   setenv ramdisk root=/dev/ram rw initrd=0x88080000
2.  
   setenv bootargs console=ttyO0,115200 $ramdisk
3.  
   bootz 0x82000000 0x88080000:0x900000 0x88000000

注意，第三条命令0x900000是代表文件系统大小

最后我们看下命令行引导过程，可以看到系统成功运行起来，完美撒花。当然目前fs只是运行在ram上面，修改文件无法存储保存在sd卡里面。后面我会出教程如何把rootfs运行在sd卡上，敬请期待。

1.  
    
2.  
   U-Boot 2019.04-00002-g07d5700e21 (Mar 06 2020 - 11:24:55 -0600), Build: jenkins-github_Bootloader-Builder-137
3.  
    
4.  
   CPU : AM335X-GP rev 2.1
5.  
   I2C: ready
6.  
   DRAM: 512 MiB
7.  
   No match for driver 'omap_hsmmc'
8.  
   No match for driver 'omap_hsmmc'
9.  
   Some drivers were not found
10.  
    Reset Source: Global external warm reset has occurred.
11.  
    Reset Source: Power-on reset has occurred.
12.  
    RTC 32KCLK Source: External.
13.  
    MMC: OMAP SD/MMC: 0, OMAP SD/MMC: 1
14.  
    Loading Environment from EXT4...
15.  
    ** Unable to use mmc 0:1 for loading the env **
16.  
    Board: BeagleBone Black
17.  
    <ethaddr> not set. Validating first E-fuse MAC
18.  
    BeagleBone Black:
19.  
    BeagleBone: cape eeprom: i2c_probe: 0x54:
20.  
    BeagleBone: cape eeprom: i2c_probe: 0x55:
21.  
    BeagleBone: cape eeprom: i2c_probe: 0x56:
22.  
    BeagleBone: cape eeprom: i2c_probe: 0x57:
23.  
    Net: eth0: MII MODE
24.  
    cpsw, usb_ether
25.  
    Press SPACE to abort autoboot in 0 seconds
26.  
    => setenv ipaddr 192.168.0.111
27.  
    => setenv serverip 192.168.0.96
28.  
    => setenv netmask 255.255.255.0
29.  
    => tftp 0x82000000 zImage
30.  
    link up on port 0, speed 100, full duplex
31.  
    Using cpsw device
32.  
    TFTP from server 192.168.0.96; our IP address is 192.168.0.111
33.  
    Filename 'zImage'.
34.  
    Load address: 0x82000000
35.  
    Loading: #################################################################
36.  
    #################################################################
37.  
    #################################################################
38.  
    #################################################################
39.  
    #################################################################
40.  
    #################################################################
41.  
    #################################################################
42.  
    #################################################################
43.  
    #################################################################
44.  
    #################################################################
45.  
    #################
46.  
    2.6 MiB/s
47.  
    done
48.  
    Bytes transferred = 9781760 (954200 hex)
49.  
    => tftp 0x88080000 ramdisk_img.gz
50.  
    link up on port 0, speed 100, full duplex
51.  
    Using cpsw device
52.  
    TFTP from server 192.168.0.96; our IP address is 192.168.0.111
53.  
    Filename 'ramdisk_img.gz'.
54.  
    Load address: 0x88080000
55.  
    Loading: #################################################################
56.  
    #################################################################
57.  
    #####
58.  
    2.6 MiB/s
59.  
    done
60.  
    Bytes transferred = 1971489 (1e1521 hex)
61.  
    => tftp 0x88000000 am335x-boneblack.dtb
62.  
    link up on port 0, speed 100, full duplex
63.  
    Using cpsw device
64.  
    TFTP from server 192.168.0.96; our IP address is 192.168.0.111
65.  
    Filename 'am335x-boneblack.dtb'.
66.  
    Load address: 0x88000000
67.  
    Loading: #####
68.  
    1.2 MiB/s
69.  
    done
70.  
    Bytes transferred = 60607 (ecbf hex)
71.  
    => setenv ramdisk root=/dev/ram rw initrd=0x88080000
72.  
    => setenv bootargs console=ttyO0,115200 $ramdisk
73.  
    => bootz 0x82000000 0x88080000:0x900000 0x88000000
74.  
    ## Flattened Device Tree blob at 88000000
75.  
    Booting using the fdt blob at 0x88000000
76.  
    Loading Ramdisk to 8f700000, end 90000000 ... OK
77.  
    Loading Device Tree to 8f6ee000, end 8f6ffcbe ... OK
78.  
     
79.  
    Starting kernel ...
80.  
     
81.  
    [ 0.000000] Booting Linux on physical CPU 0x0
82.  
    [ 0.000000] Linux version 4.14.108 (yates@yates-virtual-machine) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #1 SMP PREEMPT Wed Aug 4 10:50:09 CST 2021
83.  
    [ 0.000000] CPU: ARMv7 Processor [413fc082] revision 2 (ARMv7), cr=10c5387d
84.  
    [ 0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
85.  
    [ 0.000000] OF: fdt: Machine model: TI AM335x BeagleBone Black
86.  
    [ 0.000000] Memory policy: Data cache writeback
87.  
    [ 0.000000] efi: Getting EFI parameters from FDT:
88.  
    [ 0.000000] efi: UEFI not found.
89.  
    [ 0.000000] cma: Reserved 48 MiB at 0x9c800000
90.  
    [ 0.000000] CPU: All CPU(s) started in SVC mode.
91.  
    [ 0.000000] AM335X ES2.1 (sgx neon)
92.  
    [ 0.000000] random: get_random_bytes called from start_kernel 0xb0/0x464 with crng_init=0
93.  
    [ 0.000000] percpu: Embedded 18 pages/cpu @df928000 s41100 r8192 d24436 u73728
94.  
    [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 129412
95.  
    [ 0.000000] Kernel command line: console=ttyO0,115200 root=/dev/ram rw initrd=0x88080000
96.  
    [ 0.000000] PID hash table entries: 2048 (order: 1, 8192 bytes)
97.  
    [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
98.  
    [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
99.  
    [ 0.000000] Memory: 438552K/522240K available (12288K kernel code, 1067K rwdata, 4180K rodata, 1024K init, 354K bss, 34536K reserved, 49152K cma-reserved, 0K highmem)
100.  
     [ 0.000000] Virtual kernel memory layout:
101.  
     [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB)
102.  
     [ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
103.  
     [ 0.000000] vmalloc : 0xe0000000 - 0xff800000 ( 504 MB)
104.  
     [ 0.000000] lowmem : 0xc0000000 - 0xdfe00000 ( 510 MB)
105.  
     [ 0.000000] pkmap : 0xbfe00000 - 0xc0000000 ( 2 MB)
106.  
     [ 0.000000] modules : 0xbf000000 - 0xbfe00000 ( 14 MB)
107.  
     [ 0.000000] .text : 0xc0008000 - 0xc0d00000 (13280 kB)
108.  
     [ 0.000000] .init : 0xc1200000 - 0xc1300000 (1024 kB)
109.  
     [ 0.000000] .data : 0xc1300000 - 0xc140ae80 (1068 kB)
110.  
     [ 0.000000] .bss : 0xc14148a4 - 0xc146d348 ( 355 kB)
111.  
     [ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
112.  
     [ 0.000000] ftrace: allocating 40641 entries in 120 pages
113.  
     [ 0.000000] Preemptible hierarchical RCU implementation.
114.  
     [ 0.000000] RCU restricting CPUs from NR_CPUS=2 to nr_cpu_ids=1.
115.  
     [ 0.000000] Tasks RCU enabled.
116.  
     [ 0.000000] RCU: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
117.  
     [ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
118.  
     [ 0.000000] IRQ: Found an INTC at 0xfa200000 (revision 5.0) with 128 interrupts
119.  
     [ 0.000000] OMAP clockevent source: timer2 at 24000000 Hz
120.  
     [ 0.000015] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
121.  
     [ 0.000040] clocksource: timer1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
122.  
     [ 0.000055] OMAP clocksource: timer1 at 24000000 Hz
123.  
     [ 0.000790] timer_probe: no matching timers found
124.  
     [ 0.001013] Console: colour dummy device 80x30
125.  
     [ 0.001042] WARNING: Your 'console=ttyO0' has been replaced by 'ttyS0'
126.  
     [ 0.001050] This ensures that you still see kernel messages. Please
127.  
     [ 0.001057] update your kernel commandline.
128.  
     [ 0.001082] Calibrating delay loop... 995.32 BogoMIPS (lpj=1990656)
129.  
     [ 0.046938] pid_max: default: 32768 minimum: 301
130.  
     [ 0.047220] Security Framework initialized
131.  
     [ 0.047240] Yama: becoming mindful.
132.  
     [ 0.047330] AppArmor: AppArmor initialized
133.  
     [ 0.047410] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
134.  
     [ 0.047425] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
135.  
     [ 0.048474] CPU: Testing write buffer coherency: ok
136.  
     [ 0.048549] CPU0: Spectre v2: using BPIALL workaround
137.  
     [ 0.049030] CPU0: thread -1, cpu 0, socket -1, mpidr 0
138.  
     [ 0.063048] Setting up static identity map for 0x80100000 - 0x80100060
139.  
     [ 0.070955] Hierarchical SRCU implementation.
140.  
     [ 0.082127] EFI services will not be available.
141.  
     [ 0.086962] smp: Bringing up secondary CPUs ...
142.  
     [ 0.086982] smp: Brought up 1 node, 1 CPU
143.  
     [ 0.086995] SMP: Total of 1 processors activated (995.32 BogoMIPS).
144.  
     [ 0.087004] CPU: All CPU(s) started in SVC mode.
145.  
     [ 0.088704] devtmpfs: initialized
146.  
     [ 0.103247] VFP support v0.3: implementor 41 architecture 3 part 30 variant c rev 3
147.  
     [ 0.103704] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
148.  
     [ 0.103735] futex hash table entries: 256 (order: 2, 16384 bytes)
149.  
     [ 0.107750] xor: automatically using best checksumming function neon
150.  
     [ 0.107786] pinctrl core: initialized pinctrl subsystem
151.  
     [ 0.108988] NET: Registered protocol family 16
152.  
     [ 0.112055] DMA: preallocated 256 KiB pool for atomic coherent allocations
153.  
     [ 0.138683] omap_hwmod: debugss: _wait_target_disable failed
154.  
     [ 0.184989] OMAP GPIO hardware version 0.1
155.  
     [ 0.198579] hw-breakpoint: debug architecture 0x4 unsupported.
156.  
     [ 0.223082] raid6: using algorithm neonx8 gen() 0 MB/s
157.  
     [ 0.223105] raid6: .... xor() 0 MB/s, rmw enabled
158.  
     [ 0.223115] raid6: using neon recovery algorithm
159.  
     [ 0.230178] edma 49000000.edma: TI EDMA DMA engine driver
160.  
     [ 0.233792] SCSI subsystem initialized
161.  
     [ 0.235411] usbcore: registered new interface driver usbfs
162.  
     [ 0.235485] usbcore: registered new interface driver hub
163.  
     [ 0.235609] usbcore: registered new device driver usb
164.  
     [ 0.236181] omap_i2c 44e0b000.i2c: could not find pctldev for node /ocp/l4_wkup@44c00000/scm@210000/pinmux@800/pinmux_i2c0_pins, deferring probe
165.  
     [ 0.237678] omap_i2c 4819c000.i2c: bus 2 rev0.11 at 100 kHz
166.  
     [ 0.238056] pps_core: LinuxPPS API ver. 1 registered
167.  
     [ 0.238070] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
168.  
     [ 0.238109] PTP clock support registered
169.  
     [ 0.238626] omap-mailbox 480c8000.mailbox: omap mailbox rev 0x400
170.  
     [ 0.243274] Advanced Linux Sound Architecture Driver Initialized.
171.  
     [ 0.243968] NetLabel: Initializing
172.  
     [ 0.243984] NetLabel: domain hash size = 128
173.  
     [ 0.243992] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
174.  
     [ 0.244095] NetLabel: unlabeled traffic allowed by default
175.  
     [ 0.247312] clocksource: Switched to clocksource timer1
176.  
     [ 0.379549] VFS: Disk quotas dquot_6.6.0
177.  
     [ 0.379706] VFS: Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
178.  
     [ 0.380476] AppArmor: AppArmor Filesystem Enabled
179.  
     [ 0.392332] NET: Registered protocol family 2
180.  
     [ 0.393209] TCP established hash table entries: 4096 (order: 2, 16384 bytes)
181.  
     [ 0.393262] TCP bind hash table entries: 4096 (order: 3, 32768 bytes)
182.  
     [ 0.393324] TCP: Hash tables configured (established 4096 bind 4096)
183.  
     [ 0.393449] UDP hash table entries: 256 (order: 1, 8192 bytes)
184.  
     [ 0.393475] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
185.  
     [ 0.393686] NET: Registered protocol family 1
186.  
     [ 0.402644] RPC: Registered named UNIX socket transport module.
187.  
     [ 0.402662] RPC: Registered udp transport module.
188.  
     [ 0.402671] RPC: Registered tcp transport module.
189.  
     [ 0.402679] RPC: Registered tcp NFSv4.1 backchannel transport module.
190.  
     [ 0.403543] Trying to unpack rootfs image as initramfs...
191.  
     [ 0.404497] rootfs image is not initramfs (no cpio magic); looks like an initrd
192.  
     [ 0.475841] Freeing initrd memory: 9216K
193.  
     [ 0.476330] hw perfevents: no interrupt-affinity property for /pmu, guessing.
194.  
     [ 0.476616] hw perfevents: enabled with armv7_cortex_a8 PMU driver, 5 counters available
195.  
     [ 0.478300] audit: initializing netlink subsys (disabled)
196.  
     [ 0.479733] audit: type=2000 audit(0.476:1): state=initialized audit_enabled=0 res=1
197.  
     [ 0.479925] workingset: timestamp_bits=14 max_order=17 bucket_order=3
198.  
     [ 0.485651] zbud: loaded
199.  
     [ 0.493140] NFS: Registering the id_resolver key type
200.  
     [ 0.493195] Key type id_resolver registered
201.  
     [ 0.493205] Key type id_legacy registered
202.  
     [ 0.493228] nfs4filelayout_init: NFSv4 File Layout Driver Registering...
203.  
     [ 0.493614] fuse init (API version 7.26)
204.  
     [ 0.503468] Key type asymmetric registered
205.  
     [ 0.503493] Asymmetric key parser 'x509' registered
206.  
     [ 0.503626] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 246)
207.  
     [ 0.508005] io scheduler noop registered
208.  
     [ 0.508025] io scheduler deadline registered
209.  
     [ 0.508305] io scheduler cfq registered (default)
210.  
     [ 0.508320] io scheduler mq-deadline registered
211.  
     [ 0.509940] pinctrl-single 44e10800.pinmux: 142 pins at pa f9e10800 size 568
212.  
     [ 0.511132] gpio-of-helper ocp:cape-universal: ready
213.  
     [ 0.514208] wkup_m3_ipc 44e11324.wkup_m3_ipc: could not get rproc handle
214.  
     [ 0.515913] Serial: 8250/16550 driver, 6 ports, IRQ sharing disabled
215.  
     [ 0.519598] 44e09000.serial: ttyS0 at MMIO 0x44e09000 (irq = 30, base_baud = 3000000) is a 8250
216.  
     [ 1.302727] random: fast init done
217.  
     [ 1.306209] console [ttyS0] enabled
218.  
     [ 1.312402] omap_rng 48310000.rng: Random Number Generator ver. 20
219.  
     [ 1.319264] sdhci: Secure Digital Host Controller Interface driver
220.  
     [ 1.325539] sdhci: Copyright(c) Pierre Ossman
221.  
     [ 1.330334] omap_hsmmc 48060000.mmc: Got CD GPIO
222.  
     [ 1.415659] sdhci-pltfm: SDHCI platform and OF driver helper
223.  
     [ 1.422769] [drm] Initialized vgem 1.0.0 20120112 for vgem on minor 0
224.  
     [ 1.429930] usbcore: registered new interface driver udl
225.  
     [ 1.461384] brd: module loaded
226.  
     [ 1.467684] mmc0: host does not support reading read-only switch, assuming write-enable
227.  
     [ 1.482920] mmc0: new high speed SDHC card at address aaaa
228.  
     [ 1.489301] mmc1: new high speed MMC card at address 0001
229.  
     [ 1.500710] mmcblk1: mmc1:0001 MMC04G 3.60 GiB
230.  
     [ 1.505428] mmcblk0: mmc0:aaaa SL16G 14.8 GiB
231.  
     [ 1.516635] mmcblk0: p1 p2
232.  
     [ 1.520927] mmcblk1boot0: mmc1:0001 MMC04G partition 1 2.00 MiB
233.  
     [ 1.531791] at24 2-0054: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
234.  
     [ 1.539630] mmcblk1boot1: mmc1:0001 MMC04G partition 2 2.00 MiB
235.  
     [ 1.545984] at24 2-0055: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
236.  
     [ 1.553512] mmcblk1rpmb: mmc1:0001 MMC04G partition 3 128 KiB
237.  
     [ 1.560654] mmcblk1: p1 p2
238.  
     [ 1.564030] at24 2-0056: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
239.  
     [ 1.573882] at24 2-0057: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
240.  
     [ 1.584567] libphy: Fixed MDIO Bus: probed
241.  
     [ 1.589712] CAN device driver interface
242.  
     [ 1.647353] davinci_mdio 4a101000.mdio: davinci mdio revision 1.6, bus freq 1000000
243.  
     [ 1.655102] davinci_mdio 4a101000.mdio: detected phy mask fffffffe
244.  
     [ 1.661737] MDIO: davinci_mdio: dt: updated phy_id[0] from phy_mask[fffffffe]
245.  
     [ 1.674696] libphy: 4a101000.mdio: probed
246.  
     [ 1.678987] davinci_mdio 4a101000.mdio: phy[0]: device 4a101000.mdio:00, driver SMSC LAN8710/LAN8720
247.  
     [ 1.689281] cpsw 4a100000.ethernet: Detected MACID = 1c:ba:8c:e3:13:9b
248.  
     [ 1.696196] cpsw 4a100000.ethernet: initialized cpsw ale version 1.4
249.  
     [ 1.702686] cpsw 4a100000.ethernet: ALE Table size 1024
250.  
     [ 1.708037] cpsw 4a100000.ethernet: cpts: overflow check period 1250 (jiffies)
251.  
     [ 1.717036] usbcore: registered new interface driver smsc95xx
252.  
     [ 1.723889] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
253.  
     [ 1.730547] ehci-platform: EHCI generic platform driver
254.  
     [ 1.736027] ehci-omap: OMAP-EHCI Host Controller driver
255.  
     [ 1.741809] usbcore: registered new interface driver usb-storage
256.  
     [ 1.750404] am335x-phy-driver 47401300.usb-phy: 47401300.usb-phy supply vcc not found, using dummy regulator
257.  
     [ 1.763175] am335x-phy-driver 47401b00.usb-phy: 47401b00.usb-phy supply vcc not found, using dummy regulator
258.  
     [ 1.777401] musb-hdrc musb-hdrc.1: MUSB HDRC host driver
259.  
     [ 1.782838] musb-hdrc musb-hdrc.1: new USB bus registered, assigned bus number 1
260.  
     [ 1.790605] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
261.  
     [ 1.797473] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
262.  
     [ 1.804753] usb usb1: Product: MUSB HDRC host driver
263.  
     [ 1.809763] usb usb1: Manufacturer: Linux 4.14.108 musb-hcd
264.  
     [ 1.815382] usb usb1: SerialNumber: musb-hdrc.1
265.  
     [ 1.820787] hub 1-0:1.0: USB hub found
266.  
     [ 1.824878] hub 1-0:1.0: 1 port detected
267.  
     [ 1.839959] omap_rtc 44e3e000.rtc: registered as rtc0
268.  
     [ 1.846241] i2c /dev entries driver
269.  
     [ 1.852812] omap_wdt: OMAP Watchdog Timer Rev 0x01: initial timeout 60 sec
270.  
     [ 1.860261] softdog: initialized. soft_noboot=0 soft_margin=60 sec soft_panic=0 (nowayout=0)
271.  
     [ 1.871075] ledtrig-cpu: registered to indicate activity on CPUs
272.  
     [ 1.877640] omap-aes 53500000.aes: OMAP AES hw accel rev: 3.2
273.  
     [ 1.883832] omap-aes 53500000.aes: will run requests pump with realtime priority
274.  
     [ 1.893467] omap-sham 53100000.sham: hw accel on OMAP rev 4.3
275.  
     [ 1.902382] hidraw: raw HID events driver (C) Jiri Kosina
276.  
     [ 1.909106] remoteproc remoteproc0: wkup_m3 is available
277.  
     [ 1.920609] Netfilter messages via NETLINK v0.30.
278.  
     [ 1.925835] nf_conntrack version 0.5.0 (8192 buckets, 32768 max)
279.  
     [ 1.932621] nf_tables: (c) 2007-2009 Patrick McHardy <kaber@trash.net>
280.  
     [ 1.939268] nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>
281.  
     [ 1.946787] wireguard: WireGuard 0.0.20191219 loaded. See www.wireguard.com for information.
282.  
     [ 1.955320] wireguard: Copyright (C) 2015-2019 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
283.  
     [ 1.965326] ip_tables: (C) 2000-2006 Netfilter Core Team
284.  
     [ 1.972246] NET: Registered protocol family 10
285.  
     [ 1.982448] Segment Routing with IPv6
286.  
     [ 1.986342] mip6: Mobile IPv6
287.  
     [ 1.989373] NET: Registered protocol family 17
288.  
     [ 1.993879] can: controller area network core (rev 20170425 abi 9)
289.  
     [ 2.000212] NET: Registered protocol family 29
290.  
     [ 2.004774] 8021q: 802.1Q VLAN Support v1.8
291.  
     [ 2.009076] Key type dns_resolver registered
292.  
     [ 2.013401] mpls_gso: MPLS GSO support
293.  
     [ 2.017330] omap_voltage_late_init: Voltage driver support not added
294.  
     [ 2.024083] PM: Cannot get wkup_m3_ipc handle
295.  
     [ 2.028720] ThumbEE CPU extension supported.
296.  
     [ 2.033084] Registering SWP/SWPB emulation handler
297.  
     [ 2.038909] registered taskstats version 1
298.  
     [ 2.043253] zswap: loaded using pool lzo/zbud
299.  
     [ 2.050129] Btrfs loaded, crc32c=crc32c-generic
300.  
     [ 2.054898] AppArmor: AppArmor sha1 policy hashing enabled
301.  
     [ 2.105066] input: tps65217_pwr_but as /devices/platform/ocp/44e0b000.i2c/i2c-0/0-0024/tps65217-pwrbutton/input/input0
302.  
     [ 2.116842] tps65217 0-0024: TPS65217 ID 0xe version 1.2
303.  
     [ 2.122810] at24 0-0050: 32768 byte 24c256 EEPROM, writable, 1 bytes/write
304.  
     [ 2.254162] tda998x 0-0070: found TDA19988
305.  
     [ 2.259816] tilcdc 4830e000.lcdc: bound 0-0070 (ops tda998x_ops)
306.  
     [ 2.265948] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
307.  
     [ 2.272622] [drm] No driver support for vblank timestamp query.
308.  
     [ 2.279046] [drm] Cannot find any crtc or sizes
309.  
     [ 2.284380] [drm] Initialized tilcdc 1.0.0 20121205 for 4830e000.lcdc on minor 1
310.  
     [ 2.292046] omap_i2c 44e0b000.i2c: bus 0 rev0.11 at 400 kHz
311.  
     [ 2.299390] remoteproc remoteproc0: powering up wkup_m3
312.  
     [ 2.304739] remoteproc remoteproc0: Booting fw image am335x-pm-firmware.elf, size 217148
313.  
     [ 2.313174] remoteproc remoteproc0: remote processor wkup_m3 is now up
314.  
     [ 2.313191] wkup_m3_ipc 44e11324.wkup_m3_ipc: CM3 Firmware Version = 0x192
315.  
     [ 2.330568] bone_capemgr bone_capemgr: Baseboard: 'A335BNLT,000B,1414BBBK1169'
316.  
     [ 2.337931] bone_capemgr bone_capemgr: compatible-baseboard=ti,beaglebone-black - #slots=4
317.  
     [ 2.372368] bone_capemgr bone_capemgr: slot #0: No cape found
318.  
     [ 2.403350] bone_capemgr bone_capemgr: slot #1: No cape found
319.  
     [ 2.435948] bone_capemgr bone_capemgr: slot #2: No cape found
320.  
     [ 2.468557] bone_capemgr bone_capemgr: slot #3: No cape found
321.  
     [ 2.474430] bone_capemgr bone_capemgr: initialized OK.
322.  
     [ 2.487055] hdmi-audio-codec hdmi-audio-codec.0.auto: ASoC: no source widget found for Playback
323.  
     [ 2.496031] hdmi-audio-codec hdmi-audio-codec.0.auto: ASoC: Failed to add route Playback -> direct -> TX
324.  
     [ 2.506397] asoc-simple-card sound: i2s-hifi <-> 48038000.mcasp mapping ok
325.  
     [ 2.514989] PM: bootloader does not support rtc-only!
326.  
     [ 2.521112] omap_rtc 44e3e000.rtc: setting system clock to 2000-01-01 00:00:01 UTC (946684801)
327.  
     [ 2.529902] of_cfs_init
328.  
     [ 2.532552] of_cfs_init: OK
329.  
     [ 2.536063] ALSA device list:
330.  
     [ 2.539058] #0: TI BeagleBone Black
331.  
     [ 2.543549] RAMDISK: gzip image found at block 0
332.  
     [ 2.782321] EXT4-fs (ram0): mounting ext2 file system using the ext4 subsystem
333.  
     [ 2.796310] EXT4-fs (ram0): mounted filesystem without journal. Opts: (null)
334.  
     [ 2.803647] VFS: Mounted root (ext2 filesystem) on device 1:0.
335.  
     [ 2.809881] devtmpfs: mounted
336.  
     [ 2.819390] Freeing unused kernel memory: 1024K
337.  
     Welcome to
338.  
     ===============================
339.  
     ARM-LINUX WORLD
340.  
     BB -- BLACK
341.  
     ===============================
342.  
      
343.  
      
344.  
     Please press Enter to activate this console. [ 3.295821] [drm] Cannot find any crtc or sizes
345.  
      
346.  
     / #
347.  
     / # ls
348.  
     bin etc linuxrc proc sys
349.  
     dev lib lost found sbin usr
350.  
     / #

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